Journal title Initials Frequency DOI Online ISSN Publisher Editor in Chief Accreditation Jurnal Talenta Sipil talenta February and August 10.33087/talentasipil 2615-1634 Program Studi Teknik Sipil Fakultas Teknik Universitas Batanghari Ir. Wari Dony, ST., MT Nomor 225/E/KPT/2022 (Sinta 4) Jurnal Talenta sipil is an open access peer-reviewed journal that aims to share and discuss issues and research results. This journal is published by Program Studi Teknik Sipil Universitas Batanghari. This journal publishes scientific articles on research results and reviews covering the fields of civil engineering building, construction and architecture, engineering, industrial and manufacturing engineering, material science and nanotechnology. This journal is published twice a year, in February and August. Jurnal Talenta Sipil is published media for research results of engineering field. These results are published in such an original scientific article and a review. Submitted manuscript must be original, no plagiarism and unpublished. Manuscript is submitted online via Open Journal System (OJS), must follow author guideline and writting template. All submission will be blind reviewed by qualified reviewers in their field.
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Community Participation in the Management and Maintenance of Urban Drainage Systems in Sungai Penuh City as a Flood Mitigation Effort: A Case Study of Jl. M.H. Thamrin (Simpang Tiga Rawang Village, Hamparan Rawang District)
Flooding is a natural phenomenon that frequently occurs in Indonesia, especially during the rainy season. In Sungai Penuh City, drainage blockage due to poor maintenance is also one of the causes of flooding. Drainage systems are often not well-maintained due to the government's budget constraints. Community participation in drainage maintenance activities is expected to serve as an alternative solution to minimize flood risks. Therefore, this study was conducted to examine the drainage management and maintenance system, the level of community participation in drainage maintenance activities, and recommended solutions to optimize community involvement in drainage maintenance. The study was conducted on JL. M. H. Thamrin, Simpang Tiga Rawang Village. The assessment indicators for community participation levels were based on the Indonesian Ministry of Public Works Regulation No. 12/Prt/M/2014 concerning the Implementation of Urban Drainage Systems. This research employed a combination of quantitative and qualitative methods. The qualitative method involved interviews with informants, while the quantitative method utilized a Likert-scale questionnaire assessment for 90 households. The results indicate that out of six assessment indicators, four show that community participation in drainage maintenance remains low (below 40%). However, two indicators demonstrate active community participation, namely the prevention of building construction over drainage channels (76.67%) and reporting information to the government (57.70%). The recommended alternative solutions to enhance community participation include increasing public education through socialization, enforcing regulations and sanctions, and encouraging local communities to actively mobilize residents in self-sustained drainage maintenance efforts.
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Analysis of Factors Affecting Material Supply Chain Performance in High-Rise Building Construction Projects
The construction industry plays a vital role in the economic development and infrastructure of a country. One of its main challenges lies in the complexity of high-rise building projects, which require tight coordination in the procurement of materials, equipment, and resource management, involving multiple parties that form a complex supply chain. This study aims to analyze the factors that influence the performance of the material supply chain, in order to improve the performance of the material supply chain in the future, with a focus on the flow in the supply chain. The research involved respondents from several high-rise construction projects using purposive sampling techniques. The analysis was conducted using Partial Least Squares Structural Equation Modeling (PLS-SEM) to identify relationships among variables. The results show that information flow and financial flow have a positive and significant impact on material supply chain performance, whereas material flow does not show a significant effect. However, proper monitoring and management of material flow remain essential to improving supply chain performance.
Pemodelan 3D pada Bangunan Gedung Guna Mendukung Implementasi Bim 5D pada Proyek Konstruksi
Nowadays, many have developed in terms of technology and many other sectors. The use of The use of the latest technology also has a big impact on the construction business in Indonesia. Indonesia. Technological developments in the construction sector also have an impact on increasing the value of development efficiency. BIM can overcome work delays and minimize errors in calculating costs on some construction work Therefore, the purpose of this research is to modeling the structural system in three dimensions (3D) on the building as part of the Building Information Modeling (BIM) implementation. The method used in this research is by modeling working drawings and materials previously obtained from working drawings and materials previously obtained from the project used as the object of research into a three-dimensional (3D) object. object of research into a three-dimensional (3D) object using relevant and appropriate software, which will support the implementation of the project to support BIM Implementation. implementation of the project to support the Implementation of 5D BIM on construction projects. Construction project. The results showed that the three-dimensional (3D) structural system can be modeled (3D) structural system can be modeled on the work of columns, beams, foundations, stairs, ramp, and floor plate. The results of this research are expected to support implementation of BIM at least up to 5D level so that it can be known the cost efficiency of thecost efficiency in building work
Pemodelan Kapasitas Sungai Air Bayas di Kecamatan Kemuning Kota Palembang dengan Pendekatan HEC-RAS
Palembang is a city that often experiences flooding which is detrimental to the community.. Flooding can occur for various reasons, including drainage systems that often do not function properly, a lack of water absorption areas in large cities, and rivers that can no longer accommodate the volume of water during heavy rain. One of the rivers in the city of Palembang, namely the Bendung River, is located in the Kemuning District. The problem with this river is that it has many tributaries contributing to its main flow. The purpose of this research is to analyze hydrology, with rainfall data analyzed using normal distribution, log-normal, log-Pearson III, and Gumbel methods. The results of the research conducted on the Air Bayas River showed the flood discharge values for different return periods: 2-year return period: 9.317 m³/s, 5-year return period: 10.552 m³/s, 10-year return period: 11.364 m³/s, 25-year return period: 12.386 m³/s, 50-year return period: 13.147 m³/s, 100-year return period: 13.910 m³/s. The ideal dimensions of the channel with a depth of 2.35 m and a planned width of 6 m are necessary to accommodate the flood discharge without overflowing.
Cangkang Kerang Sebagai Subsitusi Agregat Halus terhadap Kuat Tekan Beton
Concrete is a major construction material that is often used in modern construction due to its flexibility and durability. This study aims to examine the potential of green mussel shells as a partial substitute for fine aggregate in concrete mixtures. Green mussel shells, which are mostly composed of calcium carbonate, offer an environmentally friendly solution by utilizing waste to support the sustainability of the construction industry. This study used an experimental method with variations in green mussel shell substitution of 0%, 5%, 10%, 15%, and 20%. The concrete making process involves mixing cement, coarse aggregate, fine aggregate, water, and crushed mussel shells. The concrete compressive strength test was carried out after curing for 28 days. The results showed that the higher the percentage of mussel shell substitution, the lower the compressive strength of the resulting concrete. At low substitution (5%-10%), concrete still meets the criteria for non-structural applications, with an average compressive strength ranging from 8.37 MPa to 9.05 MPa. At high substitution (15%-20%), the compressive strength of concrete decreased significantly to an average of 6.48 MPa. Substitution of green mussel shells has the potential as an alternative material in concrete, taking into account the maximum limits of its use to maintain the mechanical performance of concrete.
Karakteristik Material Tanah Galodo Gunung Marapi terhadap Potensi Bencana
Mount Marapi in West Sumatra is an active mountain with a history of disasters, including galodo or flash floods due to eruptions and high rainfall. The soil material carried by the galodo greatly influences the potential for disaster. This research analyzes the classification and characteristics of galodo soil material and its relationship with disaster potential, as well as determining mitigation efforts that can be carried out. This research method uses laboratory experiments. Soil samples were taken from 16 points at seven river locations, namely Batang Jambu, Batang Malanang, Batang Bangkahan, Batang Arau, Sungai Talang, and Batang Anai, with a distance of 50 meters between points. Samples were collected in the form of disturbed soil, which was then analyzed to determine its physical and mechanical properties. The results showed that the galodo soil material was classified as sand (SW), silty sand (SM), and clayey sand (SC). Its physical properties include a specific gravity of 2.65-2.67, a bulk density of 1.61-1.96 gr/cm3, and a plasticity index of 8.25-9.17%. Mechanically, the soil has a cohesion of 0.029–0.071 kg/cm2 and a deep shear angle of 26.57–37.77°. These characteristics indicate non-cohesive properties, so when saturated due to high rainfall, the pore water pressure increases and causes high-speed debris flow. The kinetic energy of these flows can damage riverbanks, settlements, and infrastructure. Mitigation measures include structural measures such as the construction of check dams, groundsills, and sabo dams, as well as non-structural measures such as early warning, disaster education, and limiting settlements on riverbanks.
Evaluasi Strategi Lot Sizing pada MRP untuk Optimasi Biaya Logistik Material Konstruksi
Material Requirement Planning (MRP) is a critical approach for managing material procurement in construction projects to ensure timely delivery, avoid surplus inventory, and optimize logistical costs. In construction, inefficient planning often results in material shortages, excess stock, and delayed project completion, contributing to significant cost overruns. The choice of lot sizing strategy within the MRP system plays a central role in balancing ordering frequency and storage costs. While classical methods such as Economic Order Quantity (EOQ), and Lot for Lot (LFL) are widely known, limited studies have applied a comparative evaluation of these methods specifically in construction logistics under real-world constraints. Most prior research emphasizes manufacturing applications, leaving a knowledge gap in dynamic, schedule-driven environments like public infrastructure projects. This study evaluates two lot sizing strategies, EOQ and LFL, using empirical data from a palm oil mill construction project in Mandailing Natal, Indonesia. A quantitative descriptive method was applied, utilizing data from master production schedules, bill of quantities (BOQ), and actual procurement cost records. The evaluation measured total procurement costs, ordering frequency, and inventory levels. The findings reveal that the LFL strategy results in the lowest total logistic cost at Rp 685,976,950.54, compared to EOQ at Rp 769,658,817.20, due to the complete elimination of holding costs despite higher ordering frequency. This implies that LFL is more suitable for government construction projects with short-term schedules and varying material demands, where minimizing storage risk is prioritized. The study contributes to procurement optimization under Indonesia’s public goods and services framework and recommends selective lot sizing strategies based on material characteristics and project dynamics.
Penerapan BIM dalam Simulasi Evakuasi pada Desain Tangga Evakuasi Gedung Baru PMI Jakarta
The new PMI Jakarta building is a healthcare facility and staff office of PMI, established by the Jakarta Provincial Government. This new 10-story building has a total area of 12,554 square meters and is designed to accommodate 28 people per square meter. Due to its function, the building will be used with a high occupancy density. This density is related to evacuation time in case of emergencies such as earthquakes or fires. With the advancement of Building Information Modeling (BIM) technology, emergency evacuation within the building can be simulated using crowd simulation. This article aims to provide information on how BIM is applied to simulate emergency evacuation on the evacuation stairs designed for the new PMI Jakarta building. The results obtained show that the time required to evacuate all building occupants using the available evacuation stairs is 214.3 seconds or 3 minutes and 57 seconds. With BIM technology, evacuation simulation can be implemented in the planning stage of a building. This technology helps determine the outcome of a design when various evacuation scenarios are applied, such as estimating the time required to evacuate all occupants and identifying the fastest and safest evacuation routes.
Pengaruh Prasarana Jalan terhadap Tingkat Keselamatan Pengguna Jalan di Jalan Desa Tarahan, Kecamatan Katibung, Kabupaten Lampung Selatan
Traffic safety is a condition to reduce the risk of accidents during traffic caused by drivers, vehicles and the environment. On the Tarahan road section there are no traffic signs and there are several road sections that do not have road markings or have faded. The importance of this study is to determine the level of safety on the Tarahan road section, Katibung District, South Lampung. The method used is the quantitative method and the survey method. The questionnaire for this study uses two tests, namely the validity test and the reliability test using SPSS software and has been declared valid and the data instrument can be trusted. The questionnaire to road users and the survey method are in the form of data on the speed of drivers and road infrastructure. The average speed obtained for Light Vehicles (KR) is 47.19 Km / Hour, Heavy Vehicles (KB) is 37.87 Km / Hour and Motorcycles (SM) is 44.64 Km / Hour. After distributing the questionnaire to 100 respondents, the Likert scale/level of importance of road infrastructure was 92.4% and can be seen in the score interpretation criteria, namely that drivers agree on the importance of road infrastructure for road safety.
Financial Feasibility Study of 4-Storey Building Development (Case Study: Center for Language and Culture Building)
Indonesia's rapid population growth, accompanied by significant developments in the field of education, has driven the need for educational facilities. One of the initiatives that can be carried out is the construction of the Center for Language and Culture Building. However, before the construction of the building is carried out, a financial feasibility study should first be carried out. Thus, research was carried out aimed at ensuring that development projects are financially feasible and avoid losses in the future. The method used is the Discounted Cash Flow (DCF) method, using NPV, IRR, BCR, ROI, and Payback Period as the eligibility assessment criteria. The data needed includes building development planning data and building operational data. The results of the analysis are a positive NPV of ID15,312,986,696.52, IRR of 28.28%, BCR of 2.47, ROI of 34.73%, and a payback period of 3 years and 8 months, which shows that the project is feasible to be implemented.
Analisis Data Operasional Mrt Fase 1 terhadap Prediksi Jumlah Penumpang di Fase 2
Urban congestion in rapidly growing cities like Jakarta necessitates efficient, data-driven transportation planning. As part of Indonesia’s efforts to modernize its urban mobility systems, the Jakarta Mass Rapid Transit (MRT) has emerged as a strategic initiative to reduce traffic dependency on private vehicles. While Phase 1 of MRT Jakarta has been operational since 2019, Phase 2 development requires a reliable forecasting framework to anticipate future passenger demand and support infrastructure planning. However, previous studies often rely on macroeconomic projections rather than empirical operational data, leaving a gap in predictive accuracy. This study aims to analyze the influence of MRT Jakarta phase 1 operational data on the prediction of passenger numbers in phase 2 as the basis for evidence-based transportation development planning using a hybrid approach: ARIMA forecasting and multiple linear regression modeling. Primary data were gathered from 125 MRT users via Likert-scale surveys, while secondary data were derived from MRT Jakarta’s operational reports from 2019–2023. Here we show that service quality and multimodal integration significantly increase ridership, while fare levels and poor accessibility negatively affect passenger volume. The ARIMA model, however, shows limited accuracy (R² = 0.164; MAPE = 62.225%), indicating high variability due to pandemic-induced fluctuations. In contrast, regression analysis explains 44.1% of ridership variation, offering a more actionable basis for forecasting. These findings suggest that MRT Phase 2’s success will depend not only on physical expansion but also on improved intermodal integration, user-centered service quality, and competitive fare strategies. The study contributes to transport planning by integrating quantitative modeling with user behavior insights for data-driven infrastructure scheduling.
Potensi Pemanenan Air Hujan Untuk Kebutuhan Air Non Domestik pada Peternakan Ayam Petelur di Jati Agung, Lampung Selatan
Mas Kus Layer Chicken Farm uses groundwater to meet its clean water needs. There is not enough groundwater on this farm to meet all clean water demands. To increase the availability of clean water, a Rainwater Harvesting (PAH) system was installed as a backup plan and an effort to use natural resources. A hydrological approach was used to analyze the maximum daily rainfall, which was then used to collect rainwater. This study used a quantitative descriptive methodology, and the rainfall of Mas Kus Layer Chicken Farm, the roof area of the building, the capacity of the reservoir, and the need for clean water provided supporting data. The results of the analysis showed that the potential for rainwater harvesting could meet up to 99% of the total clean water needs at Mas Kus Layer Chicken Farm. The storage system used is a Ground water Tank measuring 10x10x2.26 m. With this capacity, the rainwater that can be collected reaches 7,530 liters/day or 7.53 m3/day so that in one month it can accommodate around 226 m3/month.
Model Prioritisasi Penanganan Jalan Kota Jambi Berbasis Metode Analytical Hierarchy Process
Road maintenance, as an effort to maintain its performance, plays a crucial role in a road network management system. However, insufficient resources and differences in how stakholders perceive this issue pose challenges in the process of programming road maintenance. This study aims to develop a road maintenance prioritization model based on the Analytical Hierarchy Process (AHP) for the road network under the authority of the Jambi City Government. The AHP-based weighting is conducted based on a hierarchical decision-making model for road maintenance, which consists of three main criteria: technical road conditions, socio-economic factors, and connectivity, along with their respective sub-criteria. The results of the study show that in the main criterion, road technical conditions weighted the highest of all with a value of 0,65. Followed by connectivity at 0,19 and socio-economic at 0,16. Then regarding the sub-criterion, the highest global weight is road damage level, with a value of 0,28. The model developed in this study is expected to be used as a decision-making support tools to program road maintenance. The multi-criteria assesment which was conducted is expected to evaluate road priority level holistically and provide a new perspective in decision-making.
Evaluasi Penerapan Keselamatan dan Kesehatan Kerja Bekerja di Ketinggian pada Konstruksi Bangunan Gedung
Building construction work is one of the sectors with a high risk of work accidents, especially in activities at height. This risk is influenced by project dynamics, limited workforce experience, work environment conditions, and weak implementation of occupational safety and health (K3) management. This study aims to identify the main problems in construction work at height and evaluate the implementation of applicable K3 regulations, standards, methods, and techniques. The focus of the study is directed at the consistent application of K3 Construction methods and regulations at the stages of implementing lower structure, basement, architecture, upper structure, mechanical, electrical, plumbing (MEP) to testing and specifically for upper structure and MEP work, K3 Construction methods and regulations and K3 working at height are applied. The research method used is evaluative-qualitative with field observation and document analysis, followed by integrated application of K3 procedures on the projects studied. The results of the study after the joint application, references, standard procedures, regulations, K3 construction methods and K3 working at height that are consistent in the construction projects that have been observed, it is concluded that the method has been able to significantly minimize work accidents in the workplace.
Karakteristik Campuran Asbuton pada Lapis Aus AC-WC ada Lapis Aus AC-WC dengan Penambahan BGA B 5/20 sebagai Agregat Halus pada Aspal Pengikat 60/70
Premature pavement damage caused by heavy traffic loads remains a major challenge in Indonesia’s transportation infrastructure. One potential solution is the use of local materials such as Asbuton, particularly Buton Granular Asphalt (BGA) type B 5/20, as fine aggregate. This study aims to analyze the Marshall characteristics of Asphalt Concrete–Wearing Course (AC-WC) mixtures incorporating BGA B 5/20 and fly ash as filler. The research employed the Marshall test method on 60 specimens, with variations in asphalt content (5%–7%) and BGA composition (2%, 2.5%, and 3%) combined with 1.5% fly ash. Parameters evaluated include stability, flow, density, and Marshall Quotient (MQ). The results show that the optimum asphalt content of 6.2% provided the best performance in the mixture containing 2% BGA and 1.5% fly ash, yielding a stability of 1,755.21 kg, flow of 3.21 mm, density of 2.271 gr/cc, and residual MQ of 98.18%. All values met the Indonesian Ministry of Public Works specifications for heavy traffic pavements. In conclusion, the incorporation of BGA B 5/20 enhances the stability and deformation resistance of AC-WC mixtures, supporting the sustainable use of local materials in road construction.
Mitigasi Faktor-Faktor Penyebab Cost Overrun pada Proyek Gedung Pendidikan
Cost overrun is a significant challenge in construction projects, including educational buildings, which results in budget cuts, project delays, and increased maintenance costs. This study analyzes cost overruns on three projects in Central Java: IAIN Kudus Integrated Laboratory Building (1%), UIN Walisongo Mahad Building (2.3%), and Rembang MIN 1 Class Building (10%). These three projects were chosen because they have varying scales of cost increases and different characteristics of educational buildings. The research used quantitative methods with a questionnaire involving 53 respondents from consultants and contractors. Data analysis was carried out by testing validity, reliability, correlation, and dominant factor analysis using SPSS. The research results show that the main factors causing cost overrun are design changes and non-compliance with schedules (0.77), delays in material delivery (0.76), as well as inadequate planning and delays in equipment delivery (0.74). Other factors include ineffective decisions, poor financial management, and suboptimal cost control. Mitigation recommendations include improving the quality of planning, strict cost control, implementing systematic risk management, and utilizing BIM technology to increase estimation accuracy and decision-making efficiency to reduce the risk of cost overrun.
Studi Kelayakan dalam Aspek Finansial pada Pengembangan Perumahan Ababil Land Babat Lamongan
Housing is one of the most popular investment objects in Indonesia. According to the Residential Property Price Survey, housing sales were unstable in 2024. Given this condition, a feasibility study is required for housing projects under development in 2024, particularly for subsidized housing types with relatively low prices, which may result in narrow profit margins. This study conducted a feasibility analysis of the Ababil Land Babat Lamongan housing project, specifically for the 30/60 type unit. This research aims to gather information on the profit margin achieved by the company and the overall investment feasibility of the project, providing valuable considerations for companies or developers in their decision-making processes. The method used in this study is a financial aspect approach, including Net Present Value (NPV), Internal Rate of Return (IRR), and Benefit-Cost Ratio (BCR). The results show that the project yields NPV = IDR 115,222,182.95 > 0, IRR = 7.65% > MARR = 6%, and BCR = 1.031 > 1. Therefore, it can be concluded that the Ababil Land Babat Lamongan housing investment project is financially feasible.
Studi Perbandingan Produktivitas Teori dan Realitas pada Pekerjaan Konstruksi Keselamatan Pesisir di Teluk Jakarta Tahap 6 Paket 4
Coastal protection infrastructure in Jakarta Bay is essential to mitigate flooding due to sea level rise and land subsidence. The use of spun piles with inner boring methods supported by Hydraulic Static Pile Driver (HSPD) technology is intended to ensure efficient and low-impact pile driving operations. However, in practice, productivity discrepancies between theoretical planning and field realization remain a significant issue. This study aims to analyze and compare theoretical productivity (based on contractual planning) with actual field productivity in the installation of spun piles for a coastal safety project in Jakarta Bay Phase 6 Package 4. A descriptive quantitative approach was used, combining direct field observations, time-lapse video analysis, and secondary data from contract documents. Productivity was measured in meters per hour (m/h) and piles per day (piles/day). Deviations between theoretical and actual productivity were identified, and causal factors were analyzed. Theoretical productivity was 3.59 m/h with 3.5 piles/day, while actual field productivity reached only 3.2 m/h with 3.33 piles/day. This discrepancy resulted in an estimated delay of 5 workdays (4.8% deviation). The primary contributing factors were inconsistent hydraulic pressure, environmental constraints, equipment limitations, and varying operator skill levels. The study confirms that real-time monitoring and productivity assessment tools are crucial for timely project delivery. It also highlights the need for adaptive planning and systematic operator training. The findings provide practical guidance for enhancing productivity in future coastal foundation projects using HSPD technology.
Evaluasi Produktivitas Angkat Baja pada Bangunan Pabrik Kelapa Sawit
The growth of the industrial sector in Indonesia has driven the widespread use of steel structures due to their advantages in strength, construction speed, and cost efficiency. One significant application is in the construction of palm oil mills (PKS), which often face challenging site conditions requiring effective erection planning. However, steel structure erection productivity in PKS projects is frequently hindered by inappropriate work methods and unsystematic time recording. Significant variations in productivity across structural elements and the lack of comparative studies between crane and manual methods create a research gap that needs to be addressed. This study aims to evaluate and compare the productivity of steel structure erection in the Mill Building of a PKS project using crane and manual methods. A quantitative case study approach was applied at PT. Tunggal Yunus Estate, Tapung, Riau, with primary data collected through field observations, interviews, and project documentation. Productivity (kg/hour) was calculated based on the weight and installation duration of each structural element. The results show an average erection productivity of 480.98 kg/hour, with the highest productivity reaching 955.44 kg/hour for main columns and rafters using a crane. In contrast, manual methods for secondary elements such as wind bracing and canopy yielded the lowest productivity at 156.78 kg/hour. These findings confirm that crane methods are more effective for main structural elements, while the use of manual methods should be carefully adapted to site conditions to maintain time-cost efficiency.
Kelayakan Investasi dengan Metode Return on Investement (ROI) pada Proyek Pembangunan Perumahan Chrysant Luxury Land Lamongan
The growth of the residential property market, particularly in the housing sector is currently experiencing a slowdown. This condition is influenced by economic instability and a decline in consumer purchasing power. Such circumstances pose significant challenges for developers and investors, especially those in the project development phase. Based on this background, this study aims to evaluate the financial feasibility of an investment in the Chrysant Luxury Land Housing Project, which is also expected to serve as a reference for future residential development and planning. The research method employed is Return on Investment (ROI), focusing on the construction of 11 housing units. The data analyzed include revenue details, total expenditure, and the project site plan as the basis for financial calculations and simulations. The analysis results show an ROI value of 8.8%, indicating a positive return. This suggests that the project is financially profitable and feasible to proceed as an investment endeavor.
Perataan Jumlah Tenaga Kerja pada Proyek Perencanaan Pembangunan Guest House dengan Microsoft Project
Labor leveling in construction projects is a crucial strategy to optimize resources, improve work efficiency, and reduce excessive workforce fluctuations. However, this aspect is often overlooked due to the project's primary focus on timely completion rather than efficient labor utilization. This study aims to analyze the effectiveness of labor leveling in enhancing construction project efficiency. The method used is a case study of a Guest House construction project in Balikpapan with a total area of 1,514.875 m² and a duration of 308 calendar days. Microsoft Project was used to perform resource leveling through task rescheduling. The results showed that before leveling, the maximum number of workers reached 157 with uneven distribution. After leveling, the peak workforce was reduced to 125 workers, with the highest concentration occurring in week 15. Although it had no direct impact on labor wages, the implementation of leveling successfully reduced transportation and accommodation costs from Rp 1,886,830,000 to Rp 455,569,000. Therefore, labor leveling is proven to improve project efficiency and reduce potential resource waste in construction projects.
Analisis Produktivitas Tenaga Kerja dengan Metode Time Study pada Proyek Pedestrian Depan Stadion Surajaya Lamongan
Human resources are very important in the work environment, especially in the construction sector. Without a qualified and productive workforce, the project results will not be satisfactory. This research aims to observe the productivity of workers while constructing the pedestrian in front of the Surajaya Stadium in Lamongan, focusing on rebar work, formwork installation, and concreting using the time study method. The initial stage involves analyzing the project and collecting data that will be used as material for observing labor productivity. The productivity for foundation rebar work is recorded at 134.86 kg/person/day, and for column rebar work at 96.84 kg/person/day. The productivity value for formwork also varies, reaching 351.82 m²/person/day for slab formwork work.. Casting work has varying productivity, for example 9.10 m3/person/day for foundation casting. Several factors that affect productivity are the lack of worker skills, hot weather, and obstacles at the project site. The productivity of rebar work, formwork installation, and casting in this project is low due to the lack of worker skills, hot weather causing fatigue, and access barriers. To improve efficiency, training for workers, scheduling work hours, and managing the surrounding environment are necessary.
Analisis Biaya dan Waktu pada Proyek Pembangunan Gudang dan Musholla Area Mainsub Tuban III-IV dengan Metode Earned Value
The Warehouse and Musholla Development Project for the Mainsub Tuban II-IV Area is scheduled to be completed within 18 weeks with a contract value of Rp1,543,013,748.08. The purpose of this study was to determine the cost and time performance and the factors that caused the delay and progress of the project. The method used in this study is the Earned Value method which uses elements of cost and time as well as physical performance of the work. Data obtained from the project include the project Time Schedule, Budget Estimate Plan (RAB), weekly project reports, and actual costs, then cost, schedule, variance, performance index analysis was carried out by explaining the problems that emerged during the study. From the results of the analysis, it is known that the costs incurredare lower than the budgeted costs (costs are more efficient than planned) and the completion of the project is according to schedule, which is 18 weeks. However, there was a delay in progress in the 5th and 6th weeks indicated by the SPI (Schedule Performance Index) values of 0.766 and 0.934, which means that the implementation time is slower than the planned schedule caused by technical problems with the implementation of soil excavation that is not in accordance with the plan. The delay in progress can be pursued by accelerating in the 10th week to the 15th week with quite significant progress. The estimated final cost calculation result of the project is Rp1,492,777,469.16 with a completion time of 18 weeks.
Evaluasi Lahan Parkir Untuk Menentukan Daya Tampung Parkir Kendaraan Pada Area Pasar Blimbing Paciran
The Blimbing Paciran Market is a bustling economic activity center, but the available parking facilities are still limited and poorly organized. This causes parking irregularities and congestion around the market area. The main problem raised in this study is the suboptimal capacity of the parking area to accommodate the increasing number of vehicles, especially bemo vehicles. This study aims to evaluate the parking area at Blimbing Market, Paciran, in order to determine the optimal capacity for two-wheeled, three-wheeled, and four-wheeled vehicles. The research location experiences high market activity, yet the limited parking facilities often lead to disorganized parking and congestion. The research methods employed in this study are quantitative and qualitative approaches based on statistical analysis. The results of the study showed that over a 7-day observation period, the average accumulation per day was 37 motorcycles, 16 bemos (three-wheeled vehicles), and 6 cars. The average parking duration was 26 minutes for motorcycles, 29 minutes for bemos, and 29 minutes for cars. The average parking volume was recorded at 183 motorcycles, 40 bemos, and 23 cars. The parking index indicated average values of 38.99% for motorcycles, 129.76% for bemos, and 58.44% for cars. The average parking turnover rate was found to be 1.90 for motorcycles, 3.31 for bemos, and 2.08 for cars.
Studi Pengaruh Penambahan Lumpur Lapindo Sebagai Bahan Subtitusi Semen terhadap Kuat Tekan Beton
With the increasing use of concrete in the construction sector, the demand for its constituent materials, particularly cement, has also continued to rise. This study utilizes Lapindo mud as a partial substitute for cement, based on the fact that Lapindo mud contains chemical compounds similar to the main components found in cement. The objective of this research is to determine the effect of using Lapindo mud as a partial cement replacement in concrete. The study was conducted using an experimental method and referred to the Indonesian National Standard (SNI) 03-2834-2000 for concrete mix design. A total of 12 cylindrical specimens were prepared with a target compressive strength of 250 kg/cm² (K-250). The planned Lapindo mud replacement levels were 0% (normal concrete), 2%, 4%, and 6% of the cement content. Compressive strength tests were performed at 28 days of curing using a Compressed Test Machine. The average compressive strengths obtained for concrete mixes with 0%, 2%, 4%, and 6% Lapindo mud were 20.95 MPa, 19.06 MPa, 18.26 MPa, and 17.02 MPa, respectively. Based on the results, it can be concluded that an increase in the percentage of Lapindo mud in the mix leads to a decrease in the compressive strength of concrete.
Studi Kelayakan Investasi Perumahan Menggunakan Metode Net Present Value (NPV)
Investment is the activity of allocating funds to assets or projects that aim to generate profits in the future. The housing sector is one of the attractive investment alternatives because its demand continues to increase. This study aims to assess the feasibility of investing in Sakura type houses at Chrysant Luxland Lamongan Housing project. The method used is investment feasibility analysis with the Net Present Value (NPV) approach. The data analyzed includes development costs, sales assumptions, and relevant interest rates. A descriptive quantitative approach was used in data processing. The results showed that the project generated an NPV value of Rp 221,248,788.21. This value reflects the positive added value of the investment made. Thus, the construction project of Sakura type houses is financially feasible. This investment is able to provide potential profits and a good return on capital. Based on these results, the Sakura type house in Chrysant Luxland Lamongan Housing can be used as a promising investment option, especially in the midst of the high community need for decent housing and continues to increase from time to time.
Faktor-Faktor yang Mempengaruhi Tingkat Akurasi Perkiraan Biaya pada Tahap Konstruksi Gedung di Pemerintahan Kota Sungai Penuh
Inaccurate cost estimates in building construction projects are often a source of budget overruns that disrupt project efficiency, including in the Sungai Penuh City Government. Several projects, such as the construction of a community health center, PSC building, and health laboratory, show significant deviations between the planned budget and actual costs. This study aims to identify the main factors influencing the accuracy of cost estimates, determine the dominant factors at play, and analyze the combined impact of these factors on the overall quality of cost estimation. The method used is a quantitative approach through the distribution of questionnaires to parties involved in the project, including the Project Implementation Unit (PPK), contractors, consultants, and technical teams. Data analysis was conducted using Confirmatory Factor Analysis (CFA) and multiple linear regression with the assistance of SPSS 22. The results of the study revealed three significant main groups of factors, namely estimator competence, information availability, and cost estimation calculation quality. Among the three, estimator competence was the most dominant factor. The research instrument was found to be valid and reliable with KMO values > 0.5 and Cronbach’s Alpha > 0.6. The conclusions of this study emphasize the importance of enhancing estimator capacity through continuous training, providing accurate cost databases, and standardizing estimation procedures. These efforts are expected to promote budget efficiency and improve the overall success of government construction projects.
Pengendalian Biaya dan Waktu Menggunakan Metode EVM (Earned Value Management) pada Proyek Pembangunan Akses Sirkulasi Lapangan Gajah Mada
Cost and time control using the EVM (Earned Value Management) method was carried out in the Gajah Mada Field Circulation Access Development project, Lamongan Regency. The purpose of this study is to find out whether the project performance based on cost and time is in accordance with the initial project plan or not. This study uses a descriptive quantitative method that aims to describe the project situation based on the results of systematic data analysis. The results of this study obtained a positive Cost Variant (CV) value, there was no negative Cost Variant value which indicates that there was no project cost overrun. The Cost Performance Index (CPI) greater than 1 indicates a positive value, meaning that more work has been completed than expenses. A positive Schedule Variant (SV) value indicates that during this period the project has accelerated the completion of project work from the planned schedule. Meanwhile, the value of the Schedule Performance Index (SPI) is greater than 1 which means that the completion of the project work is faster than the planned schedule. From the calculation of Estimate to Complete (ETC), it is concluded that the estimated cost for the remaining work is Rp. 1,337,436,973. while the calculation (EAC) of the total estimated total cost if the reporting of the 11th week of project performance remains the same until the end of the project, it is estimated to spend Rp. 5,986,736,672 which was originally planned to cost Rp. 6,299,864,092. For the estimated project completion time (EAS) Estimate All Schedule is 13,781 weeks which was originally planned for 14 weeks.
Evaluasi Safety In Design (SID) dalam Perencanaan Konseptual SMKK di Proyek Jembatan
Indonesia remains one of the countries with the highest rates of construction accidents, with the main issues related to safety in construction projects, particularly during the design phase. Therefore, the role of design consultants is crucial in assessing safety risks throughout the design process, in accordance with the Guidelines of the Minister of Public Works Regulation No. 10 of 2021 on the Construction Safety Management System (CSMS). The research objective is to evaluate the understanding and challenges of Safety in Design (SID) practices in bridge planning projects. The study was validated using data triangulation techniques and analyzed using mixed methods. The results of the study indicate that the percentage of SMKK implementation in the Work Framework Document (KAK) for bridge project planning is 60% and 62% (good implementation), based on interviews with planning consultants, who reported an average SMKK implementation rate of 39,22% (poor implementation). Meanwhile, the questionnaire results on SMKK implementation have a percentage of 50,50% (poor implementation). The conclusion indicates that the level of understanding and practice of Safety in Design (SID) based on Ministerial Regulation No. 10 of 2021 on the Construction Safety Management System (SMKK) in bridge project planning in Indonesia has not been effectively implemented, as there are several barriers to applying the RK-SMKK in design.
Evaluasi Kinerja Operasional dan Pelayanan Trans Jateng Koridor VII Solo - Wonogiri
Trans Jateng Corridor VII Solo–Wonogiri is a public transportation service that plays an important role in supporting the mobility of the community in the Surakarta area and its surroundings, although it still faces challenges in terms of operational efficiency and user satisfaction. This study aims to evaluate the operational and service performance of the corridor and to develop recommendations for improving service quality. The study was conducted in accordance with the Director General of Transportation Regulation No. 687 of 2002 and the Ministry of Transportation Regulation No. 10 of 2012, with data collection through dynamic surveys, static surveys, and user satisfaction questionnaires. Service performance analysis used the Customer Satisfaction Index (CSI) method to obtain a comprehensive overview of customer satisfaction. The research results indicate that most operational indicators have met the established standards, although some indicators such as load factor, number of passengers, and headway are still below the ideal target. The user satisfaction level based on the CSI method reached 76.85% and falls into the satisfied category; however, several service aspects such as seatbelts, bus capacity, standing area size, and service information still need improvement. Therefore, strategic recommendations have been formulated, focusing on improving operational efficiency and service quality to meet public expectations and enhance the comfort of Trans Jateng users.
Penggunaan Semen Portland Sebagai Bahan Pengganti Abu Batu/Filler terhadap Karakteristik Aspal AC-WC
The need for high-quality road infrastructure encourages the improvement of pavement material performance, especially asphalt concrete mixtures. One of the important components in AC-WC asphalt concrete mixtures is filler, which functions to fill the voids between aggregates and increase mixture stability.This study aims to determine the effect of using Portland cement as a substitute for stone ash (filler) on the characteristics of AC-WC asphalt mixture. Tests were conducted at the Civil Engineering Laboratory of Lamongan Islamic University, using quantitative methods. Some of the parameters tested included specific gravity, ductility, softening point, flash point, and asphalt burn point, as well as Marshall testing to determine the values of stability, flow, and Marshall Quotient. This research used Portland cement filler with variations of 0%, 2%, 4%, and 5%.The results showed that the highest Marshall Properties value was found in the 5% variation with a stability value of 1472.13 kg, VMA value of 19.12%, VFA value of 80.84%, VIM value of 3.66%, flow value of 3.10 mm, and MQ value of 474.88 kg/mm. Thus, Portland cement can be used as an alternative filler in AC-WC asphalt mixtures to support better performance of the top pavement layer.
Pengaruh Variasi Ukuran dan Penempatan Void Plat Lantai terhadap Perilaku dan Kekuatan Gedung Bertingkat
One of the developments in the world of construction is the variety of structural system configuration types to ensure the strength, stability, efficiency, and safety of buildings. An example of a frequently encountered structural configuration variation is the presence of voids or holes in the floor slab of a building. Floor slabs that have voids affect the structural strength. This study aims to analyze the effect of variations in the size and placement of floor slab voids on the behavior and strength of multi-storey building structures. The results of the analysis are expected to be used as a reference in selecting the size and placement of floor slab voids in building planning. The building structure model analyzed is an 8-storey regular building structure with reinforced concrete materials. The height between floors is 4 meters and the total height of the building is 32 meters. The function of the building is an office located in Semarang City. The earthquake-resistant structural system used is the Special Moment Resisting Frame System (SRPMK). The floor plan size is 18x18 meters with a span between columns of 6 meters. The variations used are 6 void models with different sizes and placements. Each structural model is analyzed using ETABS software. The analysis results state that the larger the void size, the smaller the structural period, the smaller the inter-floor shear force value, and the smaller the inter-floor drift value. The recommendation for selecting the most effective size variations and void placement is in a structural model where the void is placed in the middle of the structure with the largest void size being 6x6 meters.
Probabilitas dan Kinerja Pelayanan Transportasi Publik pada Bus Perkotaan dengan Metode CSI dan IPA Bus Transjatim Rute Bunder-Paciran
Public transportation plays a crucial role in supporting community mobility while also reducing traffic congestion, pollution, and travel costs. The Trans Jatim Corridor IV bus service on the Bunder–Paciran route is an initiative by the East Java Provincial Government to enhance the quality of public transportation services. This study aims to assess user satisfaction with Trans Jatim’s services and analyze the probability of mode shift from previous modes of transportation to Trans Jatim. The methods employed include the Customer Satisfaction Index (CSI), Importance Performance Analysis (IPA), and probability analysis using a Stated Preference approach and binary logistic regression. A total of 98 respondents were involved in data collection. The analysis results show a CSI index value of 0.85, indicating a "very satisfied" category. The IPA identified two priority attributes for improvement: safety and comfort inside the bus (X3_2) and the availability of proper bus stops (X3_3). Meanwhile, binary logistic regression results indicate that gender and frequency of use significantly influence mode shift decisions. The probability of mode shift is recorded at 89.2% for female respondents and 89.6% for respondents who travel daily. This study concludes that while the overall quality of Trans Jatim services is very good, improvements are still needed in several service aspects.
Telaah Kritis E-Katalog Pengadaan Pekerjaan Konstruksi Berbasis Persepsi PPK pada Bidang Cipta Karya
In order to promote efficiency and transparency in the government procurement of goods and services, the use of e-catalogues has been implemented to accelerate information. This study aims to identify the factors contributing to the shortcomings of e-catalog use in construction projects. For this study, interviews were conducted with Pejabat Pembuat Komitmen (PPK) from construction projects in the Bidang Cipta Karya Dinas Bina Marga Cipta karya dan Tata Ruang Provinsi Sumatera Barat regarding e-catalog version 5. Data analysis was performed using thematic analysis. The results indicate that the e-catalog system is deemed unsuitable for construction projects. Some shortcomings of the e-catalog compared to the tender system in construction projects include the following: 1) insufficient socialization by the government to both service users and providers; 2) regulations that are still biased regarding guidelines for selecting providers and standardizing construction products; 3) limited and incomplete products that are not always available; and 4) ineffective price negotiations, which should only be used for imbalanced prices. High PPK workload due to direct provider selection by the PPK without going through the Pokja. The system is not yet integrated according to needs. Examples include the SIKaP database not being updated and the manual calculation system for selecting service providers, which can lead to typing errors by providers and service users. Therefore, applying procurement principles for goods and services through the e-catalog to construction projects is far from efficient or effective.
Studi Evaluatif Metode PCI dan SDI untuk Penilaian Kondisi Jalan Lengkong-Jatikalen
Nganjuk Regency is currently facing significant challenges related to road infrastructure damage, which hinders the distribution of agricultural products. This study aims to evaluate and compare the effectiveness of Two methods used to assess pavement condition are the Pavement Condition Index (PCI) and the Surface Distress Index (SDI), applied to the Lengkong–Jatikalen road segment. A quantitative descriptive approach with a case study method was employed. Data were collected through field surveys and traffic observations. The observed average daily traffic volume reached 5,640 vehicles per day, equivalent to 2,934 passenger car units (PCU) per day, indicating a high traffic category. The dominant types of damage were alligator cracking (49%), potholes (28%), and patches (11%). The evaluation results showed an average PCI value of 64.4 (good condition) and an SDI value of 38.6 (good condition). Differences between the PCI and SDI methods are evident in certain segments, such as STA 0+100–0+200, which received a PCI score of 48 (fair) and an SDI score of 65 (moderate), and STA 0+000–0+100, which received a PCI score of 44 (fair) and an SDI score of 25 (good). Both methods provide different insights into road conditions, with PCI being more sensitive to complex damage and more suitable for long-term planning, while SDI is more efficient for quick field inspections. Maintenance recommendations include routine maintenance for minor damage and partial reconstruction for subsidence damage. This research can serve as a foundation for more efficient and sustainable road maintenance planning.
Evaluasi Geometrik dan Perilaku Pengendara di Jembatan Ketiwon Jalan Werkudoro
Werkudoro Road in Tegal City is classified as a Class III road functioning as a secondary collector with a design speed of 40 km/h. One of the accident-prone locations along this route is at the Ketiwon Bridge. This study aims to assess the conformity of geometric road elements, specifically the horizontal and vertical alignments, with applicable technical standards, and to analyze their relationship with vehicle speed and driver behavior. A quantitative approach was applied, involving data collection through GNSS-based geometric measurements, vehicle speed surveys, and observations of traffic violations. The analysis revealed that the average operational speed reached 44 km/h, exceeding the designated design speed. The curve radius on the observed segment is 94 meters, which falls below the minimum required standard of 159 meters. Although the vertical gradient of 5.28% and the vertical curve length of 68.90 meters remain within the critical slope limit, the available stopping sight distance is only 82.50 meters—significantly lower than the required 182 meters. Based on these findings, several geometric elements of the road do not comply with existing standards and may compromise traffic safety. Therefore, improvements such as the installation of warning signs, enforcement of speed limits, and enhanced driver education are recommended to mitigate potential risks.
Penerapan Sistem Satu Arah (SSA) pada Ruas Jalan Raya Serpong - Muncul Kota Tangerang Selatan dengan Program Vissim
South Tangerang City is a rapidly growing city, resulting in an increase in traffic volume that is out of proportion to road capacity. This situation causes congestion on the Serpong-Muncul Highway, especially during rush hour. This stretch of road is lined with schools and serves as a vital access point from Bogor City to South Tangerang. Therefore, traffic engineering is needed to determine traffic performance before and after the implementation of the one-way system, and to determine its effectiveness. Analysis is carried out by calculating based on the Indonesian Road Safety Guidelines (PKJI 2023) on conditions before (divided into 2 segments) and after the implementation of the One-Way System and by using the Vissim program. Based on the results of traffic performance analysis on conditions before the implementation of the One-Way System on segment 1 (2/2 TT) the degree of saturation was 0.88 so the LOS was E. The results of the analysis for segment 2 (4/2 TT) the degree of saturation was 0.80 so the LOS was D. While after the implementation of the One-Way System the degree of saturation was 0.72 so the LOS was C. And the results of the analysis with the vissim program showed a decrease in front of Junior High Scool 8, the original LOS was B to A. While in front of Senior High School 2 the original LOS was C to A. Due to the decrease in service levels, the implementation of the One-Way System is effective in reducing congestion and improving performance on the Serpong – Muncul Highway in South Tangerang City.
Identifikasi Risiko Kecelakaan dan Keselamatan Kerja (K3) pada Pelaksanaan Proyek Konstruksi di Sumatera Selatan
The construction industry is one of the sectors with a high level of risk, particularly concerning Occupational Health and Safety (OHS). These risks may include potential workplace accidents, schedule delays, cost overruns, asset damage, and disruptions to work quality. Understanding and managing these risks is crucial to minimizing the negative impacts that may arise during project execution, including in South Sumatra Province. This study aims to identify risks that emerge due to the lack of OHS implementation in construction projects, in order to formulate strategies for risk prevention and mitigation. Data collection was carried out by distributing questionnaires to respondents from 5 building construction projects and 8 civil construction projects in South Sumatra, involving a total of 31 respondents.The analysis reveals that the highest risks in building construction projects include falling from heights, injuries caused by manual tools, and being struck by heavy equipment. Based on the data, the risk identification indicates that falling from heights is the most frequent incident. These three risks consistently received a mean score of 5, indicating a very high category in risk assessment. The causes of these risks include the failure to use Personal Protective Equipment (PPE) and unsafe, hazardous, or unhealthy workplace conditions. Risk control measures that are routinely implemented include the installation of OHS signage and safety lines, regular OHS communication with workers, routine inspections and evaluations of tools and heavy equipment, and the availability of work methods and programs. To further reduce these risks, risk control is carried out following the hierarchy of controls, beginning with Personal Protective Equipment (PPE), Administrative Controls, Engineering Controls, Substitution, and Elimination.
Manajemen Biaya dan Waktu Pelaksanaan Proyek Pembangunan Co-Working Space Kabupaten Lamongan
In construction projects, particularly in the development of the Co-Working Space in Lamongan Regency, discrepancies between the planned schedule and actual outcomes often occur, both in terms of time and cost. This is generally caused by ineffective planning and control during project execution. This study aims to analyze cost and time management of the project to achieve more efficient and timely implementation. The research method applies the Critical Path Method (CPM) as the primary approach to determine the critical path and minimum project duration, complemented by the Program Evaluation and Review Technique (PERT) to estimate time uncertainties. The results show that using CPM, the critical path involves activities A, B, D, F, G, E, V, X, AA, AB, AD, AE, AG, AK, AT, BA, AU, AV, AY, BB, BD, AZ, BH, and BE with a total duration of 136 days, saving 22 days from the initial plan of 158 days. Using PERT with the same critical path, the project is estimated to be completed in 148 days, saving 10 days, with a cumulative distribution value of 3.7, indicating a 99.98% probability of project completion before the target date. In conclusion, CPM and PERT are effective for controlling project cost and time, with CPM providing greater time efficiency.
Evaluasi Sistem Lalu Lintas Satu Arah pada Ruas Jalan Srijaya Negara
The growth in the number of vehicles in the city of Palembang is not proportional to the available road capacity, leading to traffic congestion, especially in educational areas and activity centers such as the Srijaya Negara-Padang Selasa road segment. The Palembang city government has implemented a one-way system as one of its solutions to alleviate the congestion. This study aims to analyze traffic conditions before and after the implementation of a one-way system and to evaluate the effectiveness of the policy. The research was conducted on the Srijaya Negara-Padang Selasa road segment overal seven days using a traffic survey approach, vehicle volume analysis, side friction analysis, road capacity, and degree of saturation based on the Indonesian Road Capacity Guildelines (PKJI) 2023. The rusults show that the highest traffic volume occurs during peak hours, especially in segments close to the campus area. The highest side friction was recorder in segment III at 230 SF/hour. The average degree of saturation (DS) is less than 0,47, with the level of service in classes B and C, indicating that the traffic flow is relatively stable despite the speed restrictions. The implementation of a one-way system has proven capable of improving traffic flow and accesibility. As many as 80% of respondents support this policy because it has a positive impact on mobility and increases the turnover of business operators. Thus, the one-way system is worthy of continued implementation wit improvement in controlling side obstacles and enforcing traffic regulations.
Analisis Faktor-Faktor yang Mempengaruhi Tingkat Akurasi Perkiraan Biaya Awal pada Tahap Konstruksi (Persepsi Kontraktor di kota Jambi)
Making a budget or cost estimate is part or project planning. The financial benefits that the constractor and project owner will receive depend on their level of axpertise in estimating the project cost.This research aims to identify which factors moast influence the level of accuracy of initial cost estimates at he construction stage and to find out how much influence these factors have on the level of accuracy of cost estimates. Primary data collection technique with asample of 14 respondents taken from the perceptions of contractors in jambi. The sampling technique in this research used the total sampling method. Data analysis processing in this research used microsoft excel 2010. The research result found that the factor that most influences the level of accuracy of initial cost estimates at the construction stage is the availability of data and information regarding the project with a mean value obtained 4,00 , the second factor is the technique or method used with amean value of 3,82 , the third factor is the skill and experience of the estimator with a mean value of 3,79 , and the fourth factor is the purpose of using the cost estimate with a mean value 3,40.
Penerapan Sistem Prategang pada Perancangan Struktur Bentang Panjang Gedung Poltekkes Mataram
The Mataram Poltekkes building located in Mataram, West Nusa Tenggara consists of 4 floors with a total height of 16.8m. The entire floor of this building uses a reinforced concrete structure, which makes it vulnerable to lateral forces, especially those caused by earthquakes. Earthquakes are at risk of causing building damage, therefore a strong structure is needed to carry the load of the structure and put pressure on the beams structure. One method to strengthen the structure is by using prestressed beams. This research was conducted by changing the design of the beams structure from conventional to prestressed beams structure. The research problems in this study is how the comparison of the weight efficiency of buildings using conventional beams with prestressed beams and how the effect of prestressed beams on the stretch between columns. so that researcher get the purposes of knowing the comparison of the weight efficiency of buildings using conventional beams with prestressed beams and knowing the effect of prestressed beams on the stretch between columns. In this study, a general type of data collection method was used, namely data collection carried out by collecting working drawings from project service providers. The results of the analysis showed that the prestressed beams used concrete with a compressive strength of 50 MPa, dimensions of 1.6 m x 0.6 m and an initial prestress force of 400 kN. These prestressed beams experienced a loss of prestress force of 12.87%. The number of tendons used is 1 tendon with a total of 4 strands in one tendon. The weight of the building using prestressed beams is lighter than conventional beams with an efficiency of 7.471%. In conclusion, buildings using prestressed beams are more efficient than using conventional beams
Evaluasi Penggunaan Material Bekisting Kayu pada Proyek Pembangunan Mall Pelayanan Publik Kabupaten Muaro Jambi
This formwork plays a role in printing concrete for structural work such as foundations, sloofs, columns, beams, and floor slabs. This type of formwork is the main material used wood and plywood. Repeated use of materials can affect cost efficiency, but with good results. The location of this research was carried out in a public service mall construction project with a building area of + 462 m2 which was built on the Bukit Cinto Kenangan Sengeti office complex road, Muaro Jambi Regency. The method used is to collect the necessary research data, namely the Cost Budget Plan (RAB), Work Unit Price Analysis (AHSP), Plan Drawings and material purchase reports. This study aims to compare costs between AHSP, RAB and material purchase reports needed for wooden and plywood formwork materials, namely the cost of AHSP of IDR 75,591,800 while the RAB is IDR 79,097,080 and the material purchase report is IDR 58,744,000. This study also calculates the volume requirements for repeated use of formwork (two times use) in column formwork work, the material of class III wood formwork is 5.373 while class II wood is 2.01 m3 and plywood is 47 sheets with 269 pieces of galam wood. In beam formwork work, the material of class III wood formwork is 5.29 m3 while class II wood is 2.38 m3 and plywood is 47 sheets with 265 pieces of galam wood.
Kinerja Campuran Stone Matrix Asphalt (SMA) Menggunakan Aspal Modifikasi Asbuton Murni Lawele
Indonesia’s dependency on imported petroleum asphalt for road infrastructure development presents a sustainability challenge. Utilizing local resources such as Lawele natural asphalt (Asbuton) offers a strategic alternative to reduce this reliance. This study aims to evaluate the performance of Stone Matrix Asphalt (SMA) mixtures using pure Lawele-modified asphalt (PMA 2%) and compare it with mixtures made with unmodified Pen 60/70 asphalt and polymer-modified asphalt Starbit E-55. The research was conducted through a laboratory experimental approach using standard testing methods (AASHTO and SNI). The SMA mixtures were tested for Marshall Stability, draindown, Indirect Tensile Strength Ratio (ITSR), and Cantabro loss. Results showed that the Starbit E-55 mixture achieved the highest stability (707 kg), followed by PMA 2% (678 kg), and Pen 60/70 (638 kg). Both PMA 2% and Starbit E-55 mixtures exhibited 0% draindown, superior to the 0.022% of Pen 60/70. The PMA 2% mixture achieved an ITSR value of 82.55% and the lowest Cantabro loss at 1.97%, indicating excellent resistance to stripping and abrasion. In conclusion, the use of PMA 2% provides comparable or even superior structural and functional performance to synthetic polymer-modified asphalt and presents a more environmentally friendly binder alternative.
Pengaruh Penambahan Karet Alam Cair (Lateks) terhadap Kuat Tekan Marshall pada Campuran Aspal AC-WC
To improve each quality of 60/70 penetration oil asphalt so that it becomes harder, has a high softening point, is more elastic, has good adhesion and is more durable, it is necessary to add other materials and in this research it was tried with Laston AC-WC using additional materials. liquid natural rubber (latex) This research is expected to determine the characteristics of adding liquid natural rubber to the Optimum Asphalt Content (KAO) based on Marshall parameters, so that it can provide good results for flexible pavements in the future. The aim of this research is to obtain optimum asphalt content values with asphalt percentage variations of 4.5%, 5%, 5.5%, 6%, 6.5%, and 7% from the Marshall Compressive Strength Test results and to obtain content values optimum asphalt with variations in the percentage of liquid natural rubber of 3%, 5%, 7% and 9% from the Marshall Compressive Strength Test results. The research method used was an experiment in the laboratory based on the 2018 Revision 2 Technical Specifications. From this research, the results were that KAO from test results with variations in standard asphalt was 5.9% and KAO from marshall test results with variations in liquid natural rubber content was 4.5%.
Biaya dan Waktu Proyek Gedung Satnarkoba dengan Metode CPM dan Metode PERT
In a building construction project, of course, there are many methods used to schedule a job as well as the cost budget. The purpose of this research is to determine the results of time and cost analysis on the Satnarkoba Police Lamongan Building Construction project. This research uses Critical Path Method (CPM) and Project Evaluation and Review Technique (PERT) with the help of Ms Word 2010 application program to analyze cost and time management. From the results of the analysis, a Network Diagram was found in which there was a series of critical work. Cost analysis is obtained by processing RAB and AHSP data. From this data, the volume, coefficient and wages of workers are obtained as a reference for processing workers' wage data. Based on the results of the analysis found, the critical trajectory, namely with work codes A, E, D, C, G, J, K, N, AF, and AE on a project that lasts for 180 days, gets an acceleration result of 144 days, so the chances of the project can be completed within 144 + 36 = 180 days, with a probability of 4.02%. Based on the results obtained, the average level of probability is greater than 4.02%, this is included in the very high category. In terms of costs incurred from each development, it shows optimal cost efficiency.
Penerapan Konsep Green Construction pada Pelaksanaan Bangunan Gedung di Provinsi Jambi
Global warming is a phenomenal issue today and is one of the challenges for the population in Indonesia.This environmental impact has an effect on global warming, for example, the reduction of green land due to development, waste of energy and building materials that are not environmentally friendly. Therefore, the concept of green construction was introduced in the scope of civil buildings. The purpose of this study is to obtain the percentage of contractors' understanding of the concept of green construction, and to obtain information about what obstacles are faced by contractors in Jambi Province in implementing the concept of green construction. This research was conducted using a questionnaire method, namely with data directly collected by researchers from the field. And for data processing, it is carried out by descriptive methods. The population was taken from contractors handling building projects in Jambi province in 2023 where the sample was 10 contractors. The results of the study show that the percentage of contractors' understanding of the concept of green construction is familiar with the term green construction. And the obstacle factor for contractors in Jambi province in implementing the concept of green construction is the lack of detailed rules regarding the concept of green construction and the lack of artenative materials and implementation in implementing green construction.
Perbandingan Stabilitas Dinding Penahan Tanah Tipe Bronjong dengan Tipe Kantilever di Kabupaten Probolinggo
Retaining walls (DPT) are essential structural elements in geotechnical engineering that function to withstand lateral earth pressure, especially in areas with elevation differences or slopes that are at risk of landslides. This study aims to analyze and compare the stability of two types of retaining walls: gabion retaining walls and cantilever retaining walls, based on safety factors against overturning, sliding, and bearing capacity. The study was conducted at a construction site in Probolinggo Regency using secondary data consisting of borehole soil investigation data and design drawings. Calculations of active and passive earth pressures, moments, and safety factors were performed manually using the Rankine method. The results show that the cantilever retaining wall has a higher overturning stability of 3.2, compared to 2.73 for the gabion wall. The cantilever wall also has a sliding stability of 2.76 and can be more optimally adapted to the soil's bearing capacity through a foundation design yielding a value of 7.95, compared to the gabion wall’s sliding stability of 2.07 and bearing capacity of 3.4. Therefore, the cantilever retaining wall is selected as an alternative to the existing gabion wall, as it outperforms in all safety factor assessments, including overturning, sliding, and bearing stability.
Analisis Kapasitas dan Dimensi Reservoir PDAM Aurduri
The increasing population in Jambi city every year has an impact on the increasing need for clean water. As a regional drinking water company, PERUMDA Tirta Mayang needs to plan clean water needs and calculate reservoir capacity to meet customer water needs. The purpose of this study is to determine the effective reservoir volume at IPA Aurduri as one of the IPAs with the largest processing capacity, project clean water needs, and calculate the effective reservoir volume for the next 10 years. The projection formula is used to project the needs for the next 10 years. The projection formula used is geometric, arithmetic which will then be selected the best for the projection calculation. IPA Aurduri has a processing capacity of 270 l/s and a total reservoir capacity of 2,500 m3. The projection results for the next 10 years, customer clean water demand is 189,095 lt/sec, and the average daily water requirement is 249,605 lt/sec. The required reservoir volume is 5,400 m3. So PERUMDA needs to increase its capacity by 2,900 m3.
Penilaian Kinerja dan Angka Kebutuhan Nyata Operasi dan Pemeliharaan (AKNOP) Sungai Pecangaan di Kabupaten Jepara
Rivers are one of the water sources that are very important for human survival. The decline in the function of river facilities and infrastructure has a significant impact on the lack of fulfillment of the need for raw water and control of the destructive power of water. Therefore, it is necessary to handle the maintenance of river facilities and infrastructure so that they can function properly, namely by conducting surveys and inventories of river facilities and infrastructure and immediately addressing the causes of the decline in the function of river facilities and infrastructure that occur. The main objective is to determine the physical condition and function of the performance assessment of river facilities and infrastructure and to obtain the ROMNF (Real Operation and Maintenance Needs Figures) needed in the OM (Operation and Maintenance) activities of a river in the future. In preparing the performance assessment and ROMNF of the river, it refers to Guidelines for Organizing Operation and Maintenance Activities for Facilities and River Maintenance, namely Circular Letter of the Director General of Water Resources No. 05/SE/D/2016. The results of the study showed that the Pecangaan River, which is 18,380 km long, has a performance assessment result of 87.97% with recommendations for preventive maintenance. Meanwhile, ROMNF 's requirement for the Pecangaan River in Jepara Regency is IDR 10,342,578,256.00.
Kajian Manajemen Pemeliharaan Jalan Berdasarkan Korelasi Nilai Kerusakan terhadap Nilai Roughness Jalan Berbasis Roadlab-Pro
Road infrastructure is a critical component of land transportation systems, supporting both human mobility and the distribution of GOODs. To ensure user safety and comfort, roads must be maintained in optimal condition through appropriate and sustainable maintenance strategies. This study aims to formulate a road maintenance management strategy based on an analysis of the relationship between the International Roughness Index (IRI), as obtained through the Roadlab Pro application, and the extent of road damage as assessed by the Pavement Condition Index (PCI) method and the Bina Marga standard. A quantitative-descriptive method was employed, focusing on a 3-kilometer section of the Pondok–Pulau Sangkar Road in Kerinci Regency. Data were collected through a seven-day field survey, which included IRI measurements and visual damage assessments. The analysis revealed a very strong negative correlation between IRI and PCI values, indicating that higher IRI scores correspond to worse road conditions. Based on these findings, three maintenance budget planning scenarios were proposed: (1) maintenance based on actual damage, (2) routine annual maintenance, and (3) road upgrading in the first year, routine maintenance in the second year, followed by periodic maintenance from the third to the fifth year. The cost estimates encompass periodic, preventive, corrective, and routine maintenance, providing a comprehensive basis for medium-term planning. In conclusion, this study demonstrates that IRI data obtained from Roadlab Pro can serve as a reliable and efficient reference for evaluating road conditions and developing effective maintenance strategies based on the PCI approach.
Manajemen Waktu dan Biaya Proyek dengan Sistem Crash Menggunakan Microsoft Project pada Peningkatan Jalan Soko – Karangbinangun
Time and cost management play an important role in the success of a construction project. Therefore, project planning and scheduling must be done carefully before implementation begins. The Soko – Karangbinangun road improvement project faces a number of challenges, especially in terms of time management. In this project, the work that was supposed to start on September 3 according to the contract, was delayed and only started on September 23. This condition has the potential to cause delays in project completion. This study aims to compare the results of theoretical calculations with the factual conditions in the field, and to evaluate the possibility of accelerating the project schedule without sacrificing cost efficiency. The acceleration method used in this study is the overtime system with variations in duration of 1, 2, and 3 hours. Ms. Project is used as a tool to identify the critical path in the project. The results of the analysis show that out of 9 initial work items, there are 8 items included in the critical path. With a variation of 1 hour overtime, the project duration can be accelerated to 68 days, 10 days shorter than the normal duration of 78 days, with a crashing cost of Rp. 1,233,684,874.50 from the normal cost of Rp. 1,229,803,328.00. For 2-hour overtime, the work can be completed in 59 days, 19 days faster than the normal duration, with a crashing cost of Rp. 1,246,809,926.00. While for 3-hour overtime, the project can be completed in 51 days, or 27 days faster than the normal duration, with a crashing cost of Rp. 1,264,842,460.50. From the results of the analysis that have been known, it can be concluded that the 2-hour overtime variation method is more effective to apply.
Pengaruh Variasi Sudut Kemiringan Instalasi Soil Nailing pada Perkuatan Lereng
Slope stability is a critical aspect in the planning and implementation of construction projects in contoured or sloped areas. One commonly used reinforcement method is soil nailing, which involves the passive installation of steel bars to increase slope resistance against lateral earth pressure. This study aims to analyze the effect of nail installation angle variation on slope stability parameters under two slope conditions, namely 27° , 35° and 45°. The simulation was carried out using PLAXIS 2D version 2024, with nail angles ranging from 10° to 90°. The parameters analyzed include safety factor, maximum horizontal deformation, horizontal effective stress, and bending moment in the nail elements. The simulation results show that lower installation angles, around 10° to 25° provide the most optimal performance in terms of safety improvement, reduced deformation, stable stress distribution, and efficient structural response. The steeper slope (35°) generally produced higher deformation, stress, and bending moment values compared to the 27° slope, indicating that steeper slopes impose greater internal loads on the reinforcement system.
Manajemen Risiko Kesehatan, Keselamatan, Kerja dan Lingkungan (K3L) pada Proyek Pembangunan Embung Tukad Unda Provinsi Bali
The construction work of the Tukad Unda Reservoir is located in a former sand quarry area characterized by water-filled pits and unstable coral aggregates. This area also serves as a lahar flow path during eruptions of Mount Agung, which remains active. This condition was identified through geological and geotechnical sampling tests. The aim of this study is to analyze the Occupational Health, Safety, and Environment (HSE) risks that can be identified in this project. Data were collected through interviews, brainstorming sessions, and field observations. Risk coefficients were scored based on risk acceptability. The assessment focused on dominant risks that require management actions, specifically those categorized as “high” and “very high” risk levels. The final identification results revealed a total of 75 risks based on the type of work, consisting of 28 risks (37%) in sub-structural work, 41 (55%) in structural activities, and 6 (8%) in architectural activities. Based on the sources of risk, 26 risks (35%) originated from equipment, 27 (36%) from materials, and 22 (29%) from environmental factors. In terms of impact targets, 64 risks (85%) affect humans, 10 (13%) affect both humans and the environment, and 1 (1%) affects the environment alone. Based on the analysis using the AS/NZS 4360:2004 standard, 17 risks (23%) were classified as low risk, 39 (52%) as medium risk, and 19 (25%) as high risk. Risk ownership was predominantly allocated to the contractor's HSE supervisors (56%), followed by site managers (35%) and technical staff (9%). It is recommended that competent and authorized personnel at the project site conduct safety briefings before commencing any work activities to minimize the potential for unwanted incidents. Workers are also advised to pay more attention to occupational health and safety by wearing appropriate personal protective equipment (PPE) and complying with all established regulations and standard operating procedures (SOPs).
Rekomendasi Hasil Analisis Pengendalian Biaya Perbaikan Dermaga Apung di Pelabuhan Talang Duku, Jambi
Indonesia's high logistics costs, reaching 23% of its GDP, highlight the urgent need for port efficiency as a key solution. This study aims to analyze the factors contributing to cost overruns in the floating pier repair project at Talang Duku Port, Jambi, and to formulate effective cost control recommendations. The research employed cost control breakdown structure analysis, multiple linear regression using the Least Squares method via EViews 10, and Interpretative Structural Modeling (ISM) to determine improvement priorities. The findings reveal 21 variables affecting cost overruns, with five dominant factors: design errors, financial difficulties, inflation, poor management and supervision, and ineffective communication. Among these, design errors had the most significant impact, with the highest coefficient (0.064471). Based on ISM analysis, the top priority corrective actions include anticipating sudden design changes, financial difficulties, and inflation, followed by improving project management and communication systems. The study concludes that proper design planning and strong coordination among stakeholders are crucial to minimizing cost overruns and enhancing overall port efficiency.
Struktur Tahan Gempa terhadap Ketidakberaturan Horizontal dan Vertikal Gedung Pendidikan Terpadu Agribisnis Politeknik Negeri Jember
Indonesia, located at the meeting point of three active pelates, is an earthquake-prone country, including Jember Regency which is close to the source of the Indo-Australian Pelate subduction earthquake. This condition requires building planning that is able to withstand earthquake loads in accordance with applicable earthquake resistance standards. One method used to weaken the resistance of structures to earthquakes is pushover analysis, which aims to determine the maximum force, freezing, and collapse patterns in structures due to earthquake loads. This study focuses on analyzing the irregularities of the horizontal and vertical structures of the Integrated Agribusiness Education Building of the Jember State Polytechnic using SAP2000 v22 software, which refers to the provisions of SNI 1726: 2019. The method used is quantitative analysis to transmit the performance of earthquake-resistant building structures. SAP2000 allows statistical, dynamic, linear, and nonlinear analysis to ensure structural resistance to earthquake loads, as well as identify important components that require special attention to stability. The analysis results show the presence of horizontal irregularities type 2 on the roof floor due to changes in lateral stiffness, as well as vertical irregularities type 2 (mass) due to the effective mass exceeding 150% of the floor below. Pushover analysis indicates the potential for local collapse in the ground floor columns, but the structure remains stable with roof drifts in the Damage Control category. This indicates that the building remains safe to use after the earthquake.
Pemilihan Rute Tol dan Non-Tol Menggunakan Metode Stated Preference: Studi Kasus Koridor Malang-Surabaya
The development of toll roads in the Malang-Surabaya corridor has transformed travel patterns and provided route alternatives for road users. This study analyzes factors influencing route choice decisions between toll and non-toll roads using the Stated Preference (SP) method. A survey was conducted on 103 respondents using experimental design involving three main attributes: travel cost difference (IDR 15,000-45,000), travel time difference (15-45 minutes), and travel distance difference (3-9 km). The analysis results show that travel cost and travel time significantly influence route choice with excellent model fit (R² = 0.724), while travel distance has minimal effect (R² = 0.089). The utility model produces a Value of Time of IDR 44,045 per hour with preference equilibrium points at cost difference of IDR 22,340 or time difference of 18.9 minutes. Segmentation analysis reveals significant preference heterogeneity where private car users show 66% toll preference compared to motorcycle users at only 14%. Business travelers demonstrate higher toll preference (36%) compared to non-business travelers (64%). The model achieves 95.7% prediction accuracy and can be applied for dynamic pricing strategies, traffic distribution forecasting, and optimal toll tariff policy evaluation for efficient transportation planning in similar corridors.
Muhammad Ibadurrahman Arrasyid Supriyanto
Pengaruh Penambahan High Performance Superplasticizer terhadap Kuat Tekan Mortar
Currently, the development of innovation regarding concrete mortar mix design technology is being widely researched. The innovation in making mortar is the use of additives. This research aims to determine the effect of adding additives on the workability and compressive strength of mortar. The additive used is a High Performance Superplasticizer with the trademark Sika Viscocrete 8670 MN. The fine aggregate used is ex sand. Batang Hari River. The sand category used is coarse sand, based on ASTM C33. The mortar test object is in the shape of a cube with dimensions of 5x5x5 cm. The test specimens consisted of Normal Mortar (MN), Mortar with 0.6% Sika Viscocrete (MS 0.6%), and Mortar with 1.4% Sika Viscocrete (MS 1.4%). The compressive strength testing method refers to SNI 03-6825-2002 concerning Testing Methods for Compressive Strength of Portland Cement Mortar. The results of testing organic dirt in the coarse sand of the Batanghari River are unwashed sand at number 3, and sand that has been washed and soaked with 3% NaOH at number 2 on the organic plate. The compressive strength test results at 8 hours of MN were 6.97 MPa, MS 0.6% was 6.70 MPa and MS 1.4% was 7.73 MPa. The compressive strength at 1 day of age for MN was 14.68 MPa, MS 0.6% was 16.27 MPa, and MS 1.4% decreased to 14.28 MPa. The compressive strength at 7 days of MN was 19.93 MPa, MS 0.6% was 25.33 MPa, and MS 1.4% was 26.95 MPa. Compressive strength at the age of 28 days, MN's compressive strength value is superior, namely 31.53 MPa, MS 0.6% is 28.72 MPa and MS 1.4% is 28.80 MPa. The research results show that to maintain the workability of mortar mixtures that use high performance superplasticizer additives, it is necessary to reduce water. At 28 days, normal mortar has superior compressive strength compared to mortar that uses high performance superplasticizer as added material.
Evaluasi Kapasitas Parkir SD Muhamadiyah 6 Kota Palembang
Muhammadiyah 6 Elementary School, Palembang City, is one of the schools located on Jalan Jendran Sudirman, which is right in front of the main road. As a result, many parents dropping their children off at school stop on the roadside. Parking on the roadside around Muhammadiyah 6 Elementary School, Palembang, has caused significant traffic congestion, especially during the morning rush hour (6:00–7:00 AM) and afternoon rush hour (2:30–3:00 PM). This is because the existing parking facilities at the school do not meet the parking needs of vehicles. Therefore, an evaluation is needed regarding the parking capacity needs at the elementary school. The method used is a descriptive method with an inductive approach, through a field survey at 6:30–3:00 PM. The survey results show that the average daily number of vehicles entering and leaving the location is 1,472 motorcycles and 567 cars. The need for parking space reaches 149,3184 m² for motorcycles and 322,368 m² for cars, but the available land is only 105.75 m² for motorcycles and 280 m² for cars. Therefore, it can be concluded that there is a need for additional parking space or a pick-up and drop-off system by parents/guardians of students to prevent vehicles from stopping on the road and allow for smooth and orderly traffic flow
Studi Perencanaan Perkerasan Lentur pada Peningkatan Ruas Jalan Condong-Wangkal Sta. 0+000 - Sta. 7+350
Improving the quality of road sections is essential to address frequently occurring damage, such as surface cracks, potholes, and elevation reductions caused by pavement age exceeding the technical design limits. This condition directly impacts community productivity due to longer travel times, hampered distribution of goods and services, and disrupted inter-regional accessibility. Consequently, this reduces community mobility and slows regional economic growth. Probolinggo Regency, located in the northern coastal part of East Java Province, is one of the areas facing these problems. This study aims to accurately design a flexible pavement structure and prepare a cost budget plan (RAB) based on the 2024 Road Pavement Design Manual (MDPJ) guidelines. The research methods used include an average daily traffic volume (LHR) survey, subgrade quality testing, and pavement layer thickness calculations based on technical parameters. The planning results indicate that the pavement structure consists of a 6 cm thick Laston AC-WC wearing layer, a 20 cm thick class A aggregate base layer, and a 15 cm thick class B aggregate base layer. This thickness is considered sufficiently efficient in withstanding existing traffic loads. The estimated cost of implementing the road improvements is estimated at Rp616,433,000.00. The results of this study are expected to provide an efficient and sustainable technical solution to support smooth transportation, improve inter-regional connectivity, and stimulate economic growth in Probolinggo Regency.
Simulasi Luas Genangan Banjir Batang Sinamar Nagari Taram Kab. Lima Puluh Kota
Batang Sinamar is located in Lima Puluh Kota Regency, West Sumatra Province, and flows through Riau Province before emptying into the Strait of Malacca. Flooding can cause loss of life and property. In the Nagari Taram area, floods occur almost every year with an average inundation depth of 1–2 meters. However, no research has been conducted on flood control and early warning systems. Meanwhile, the economic losses experienced by the community are significant. Therefore, it is necessary to conduct simulations of flood inundation depth and flood-prone areas as an initial study for flood control planning. The simulation uses HEC-RAS 6.4.1 software, QGIS, and the DEMNAS base map from BIG. Hydrological analysis is performed using the Nakayasu and Snyder Synthetic Unit Hydrographs with flood return periods of 2, 5, 10, and 25 years. The simulation results show that the flood inundation area increases with higher return periods. For the flood event in 2019, the discharge was equivalent to a 5-year return period flood, which was 982.18 m³/s, with an inundation area of 293.51 hectares. Hazard zones (marked in red) are predominantly found along the riverbanks, with an average distance of around 100 meters from the river's edge. The study concludes that the areas along the riverbanks are unsuitable for residential settlements, schools, and agricultural activities due to inundation depths of ≥3.0 meters.
Pemanfaatan Palm Oil Fuel Ash (POFA) Sebagai Pengganti Sebagian Agregat Halus dalam Campuran Beton
This study investigates using Palm Oil Fuel Ash (POFA) as a partial substitute for some of fine aggregate (sand) in concrete mixtures. The goal is to determine the optimal percentage of POFA by testing several variations of its use as a substitute for fine aggregate. The study employed an experimental methodology involving the preparation of 15 cm x 15 cm x 15 cm cubic test specimens in accordance with SNI 03-2834-2000 (Procedures for Preparing Normal Concrete Mix Designs). The POFA percentages were 0% (control specimen), 5%, 6%, 7%, 8%, 9%, 10%, and 20%. Test results showed that the compressive strength of concrete produced using 0% POFA (normal concrete) was 228.6 kg/cm². The compressive strengths of concrete produced using 5%, 6%, 7%, 8%, 9%, and 10% POFA were 134.9, 156.9, 159.7, 198.3, 198.3, and 151.5, 159,7 kg/cm², respectively. The test results indicate that adding POFA to the concrete decreased its compressive strength relative to control specimen. However, substituting fine aggregate with POFA at 8% and 9% resulted in higher compressive strength than the other variations. The results also indicated the potential for an increase in concrete compressive strength between 10% and 20%.
Tegangan Geser Kritis di Hulu Bendung, Studi Kasus Pada Bendung Sekka-Sekka, Kabupaten Polewali Mandar
The upstream section of the Sekka-Sekka Weir plays an important role in the irrigation water distribution system but is highly vulnerable to sedimentation due to severe bed erosion. Excessive sedimentation can reduce the weir’s storage capacity and hinder irrigation efficiency. Therefore, this study aims to analyze flow shear stress and critical shear stress to understand the potential for sediment transport in the area. A quantitative approach was used by simulating flow conditions with HEC-RAS to obtain flow characteristics and river cross-sections under three discharge conditions: maximum, minimum, and average. Sediment samples were collected from the field and analyzed in the laboratory using sieve analysis and specific gravity tests, while critical shear stress was determined using the Shields diagram. The results showed that under maximum discharge, flow shear stress (6.169–6.181 kg/m²) far exceeded the critical shear stress (0.003–0.007 kg/m²), indicating a high potential for bed erosion. Under minimum and average discharge, flow shear stress still exceeded the critical value, but sediment transport occurred with lower intensity and more stable flow conditions. Overall, the upstream flow is capable of mobilizing sediment significantly, so proper sediment management is needed to maintain the optimal function of the weir.