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All Journal Jurnal Teknik Sipil U Karst Jurnal Teknik Industri Terintegrasi (JUTIN) APPLIED RESEARCH ON CIVIL ENGINEERING AND ENVIRONMENT (ARCEE) Journal of Infrastructure Planning and Engineering
Mahendra, Muhammad Oka
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Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Earth & Planetary Sciences Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

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Analysis of Factors from The Parties That Are The Source of Causes of Contract Change in Infrastructure Project in Tangerang City-Banten Province Farihah, Iis Aisatul; Mahendra, Muhammad Oka; Mahendra, T.S. Hadi
Applied Research on Civil Engineering and Environment (ARCEE) Vol. 5 No. 02 (2024)
Publisher : POLITEKNIK NEGERI JAKARTA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/arcee.v5i02.6823

Abstract

In the implementation of construction projects, problems cannot be avoided, one of which is contract change orders. This becomes a problem if it cannot be handled properly. Many factors cause change orders, including differences in understanding between stakeholders, owner requests, financial issues, scope differences, etc. SmartPLS software assessed and built a model with 13 causal change factors based on the literature review's structural relationships. The analysis technique in this research is the descriptive quantitative method. This method is used to obtain and examine structured and in-depth data that explains the behavior or circumstances being observed in depth and systematically. Data collected through the Google Form of 27 respondents to the Tangerang City PUPR Office project for improving and constructing city roads in the fiscal year 2023 were used in this study. In this study, two variables are the main focus in analyzing, in this case, the change order as an endogenous variable, and the project owner, contractor, and consultant as exogenous variables. The results of analysis using SEM-PLS found that the contractor variables have a significant effect on the occurrence of contract change orders by looking at the R-square value of 1.09 which can describe the amount of diversity that can be explained from the model built. The results of the analysis of the two types of variables are expected to be able to provide a comprehensive interpretation of the phenomenon of change orders that occur in the scope of construction, to take preventive action to prevent the occurrence of change orders, and researchers, the results of this study can be used as further study material to develop theories or related topics.
Optimalisasi Waktu dan Biaya dengan Penambahan Jam Kerja Lembur 3 Jam dan Shift Kerja Sudianto, Toto; Mahendra, Muhammad Oka; Putra, Al Fiillian Sah; Qishas, Haechal Fachar
Jurnal Teknik Industri Terintegrasi (JUTIN) Vol. 8 No. 2 (2025): April
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jutin.v8i2.43941

Abstract

In construction projects, delays often occur, causing increased costs and delays in completion. This study analyzes project acceleration with the crashing method on the Untirta Rectorate Building Construction Project, comparing the alternatives of 3-hour overtime and work Shifts. The goal is to determine the optimal project duration and cost. The analysis shows that there are 14 jobs on the critical path. The results of acceleration with 3-hour overtime resulted in a project cost of Rp3,104,007,500 with a duration of 431 days, while work Shifts require Rp1,280,228,250 with a duration of 427 days. The total slope cost for 3-hour overtime is Rp193,244,923.38, and work Shifts Rp36,611,338.93. Alternative cost comparison shows that overtime has direct costs of Rp49,158,386,780 and indirect costs of Rp3,971,376,850, while Shift work has direct costs of Rp47,334,607,530 and indirect costs of Rp3,962,700,980. Shift work is more efficient in terms of cost and time.
Analisis Pengaruh Pengetahuan K3, Sikap K3, dan Kesadaran Berperilaku K3 Terhadap Produktivitas Kerja Mahendra, Muhammad Oka; Putra, Al Fiillian Sah; Refiza, Hazazil Zabila
Jurnal Teknik Industri Terintegrasi (JUTIN) Vol. 8 No. 2 (2025): April
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jutin.v8i2.43943

Abstract

The success of a project is greatly influenced by the productivity of its workers. K3 is an indicator of the success of a project. This study aims to determine the effect of K3 knowledge on work productivity, to determine the effect of K3 attitudes on work productivity, to determine the effect of K3 behavioral awareness on work productivity. This type of research uses quantitative methods. Data collection techniques using questionnaires, unstructured interviews, field observations and literature studies. The sample in this study were construction workers at two building construction project locations totaling 125 respondents. The data analysis method used is descriptive analysis, instrument testing (validity testing and reliability testing), classical assumption testing (normality testing), multiple linear regression coefficient testing, and hypothesis testing (t-test, f-test, and coefficient of determination). The magnitude of the influence that has been proven through the determination coefficient test for the independent variable is 18.7% on the dependent variable which can be concluded that the independent variable does not have a large influence.
Analisis Kinerja Biaya dan Waktu dengan Metode Earned Value Analysis (Studi Kasus: Revitalisasi Pasar Gembrong Sukasari) Saputro, Teguh Eko; Mahendra, Muhammad Oka; Putra, Al Fiillian Sah
Jurnal Teknik Industri Terintegrasi (JUTIN) Vol. 8 No. 2 (2025): April
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jutin.v8i2.44077

Abstract

The construction industry in Indonesia continues to grow, yet projects often face deviations from initial plans, particularly concerning cost overruns and schedule delays. This study evaluates the cost and schedule performance of the Revitalization of Pasar Gembrong Sukasari Market using Earned Value Analysis (EVA), a quantitative method for monitoring project efficiency. Data were derived from weekly progress reports, S-curve projections, and the project’s budget plan (RAB). At week 35, the Planned Value (BCWS) was IDR 55,052,769,527.00, while the Earned Value (BCWP) and Actual Cost (ACWP) both amounted to IDR 49,830,463,809.67. The Cost Variance (CV) of IDR 0 and Cost Performance Index (CPI) of 1.00 indicated precise adherence to the budget. However, a Schedule Variance (SV) of -IDR 5,222,305,717.33 and a Schedule Performance Index (SPI) of 0.905 revealed significant schedule delays. These findings demonstrate that while the project maintained financial efficiency, critical time management inefficiencies led to schedule overruns. The study underscores the effectiveness of EVA in identifying performance gaps and highlights the need for improved scheduling strategies to align time and cost objectives in construction management.
Analisis Optimalisasi Waktu dan Biaya dengan Penambahan Jam Metode Time Cost Trade Off Mahendra, Muhammad Oka; Saputro, Teguh Eko; Putra, Al Fiillian Sah
Jurnal Teknik Industri Terintegrasi (JUTIN) Vol. 8 No. 2 (2025): April
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jutin.v8i2.44078

Abstract

Construction projects are bound by predefined schedules and budgets established from the outset. This study aims to optimize time and cost through a 3-hour daily overtime intervention, focusing on evaluating schedule acceleration effectiveness and resource efficiency. The Time Cost Trade Off (TCTO) method was applied via crashing techniques, systematically calculating cost-time trade-offs. Analysis centered on critical paths identified using the Critical Path Method (CPM), with schedule compression achieved through additional work hours. The findings reveal that the project duration was reduced from 180 days to 145 days, achieving a 35-day reduction (19.4%). This outcome demonstrates that targeted overtime interventions on critical activities optimize time allocation without compromising cost control, while affirming the relevance of the TCTO-CPM integrated approach in construction project management. overtime wages.
Penerapan Microsoft Project dalam Metode Crashing Terhadap Waktu dan Biaya Mahendra, Muhammad Oka; Saputro, Teguh Eko; Putra, Al Fiillian Sah
Jurnal Teknik Industri Terintegrasi (JUTIN) Vol. 8 No. 2 (2025): April
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jutin.v8i2.44080

Abstract

The PPLP Banten Building construction project experienced significant delays due to the extension of the implementation time, design revisions (shop drawings), and inaccurate material delivery. This study implemented a schedule compression strategy using Microsoft Project with two acceleration alternatives based on the AHSP standard. The crashing research method. The results of the study showed that the project duration was successfully shortened by 678 days with the 4-hour/day overtime alternative, while further work shift optimization reduced the duration to 530 days. Cost analysis showed differences between the two alternatives: with 4-hour/day overtime, the acceleration cost reached IDR3,066,675,000 (AHSP), while the work shift only cost IDR1,223,565,000 (AHSP). Comparison of cost slopes strengthened the advantages of work shifts: 4-hour/day overtime resulted in a cost slope of IDR193,067,245.23/day (AHSP), while the work shift only cost IDR33,638,199.58/day (AHSP). Evaluation of total costs (direct and indirect) also confirmed the efficiency of work shifts, with direct costs of Rp9,512,731,986.58 and indirect costs of Rp1,273,456,116.78, compared to 4 hours/day of overtime which required direct costs of Rp9,672,161,032.20 and indirect costs of Rp1,322,728,805.77.
Satisfaction and Determinants of the Decision to Switch from Private Vehicles to Commuter Trains in Merak–Rangkasbitung Mahendra, Muhammad Oka; Djuneydi, Muhammad
UKaRsT Vol. 9 No. 1 (2025): APRIL
Publisher : Kadiri University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30737/ukarst.v9i1.6629

Abstract

Urban population growth has had an impact on traffic congestion. Although public infrastructure is available, public preference for private vehicles remains high. This occurs on the Merak-Rangkasbitung route which is served by the train. The gap between service availability and user preferences indicates the need to study mode selection behavior and the factors that influence it. This study aims to analyze motorcycle and car users' tendency to shift their transportation modes from private vehicles to the train service on the Merak- rangkasbitung route. A quantitative approach was carried out using a questionnaire survey method on 300 respondents using a dual-stratum sampling technique. The analysis used the Importance Performance Analysis (IPA), Customer Satisfaction Index (CSI), and Chi-Square test. The IPA results showed a service suitability value of 86.57%, while CSI showed a satisfaction level of 72.86% (satisfied category). The Chi-Square test results identified that the factors influencing the transportation mode choice differed between segments. For motorcycle users, it was influenced by age, car ownership, and reason for travel, while car users were influenced by occupation, travel costs, reasons and purposes of travel. These findings emphasize the importance of a policy approach based on user segmentation and strengthening integration between modes to improve the effectiveness of train services. With an adaptive service strategy and targeted incentive policies, the transformation towards sustainable urban mobility can be realized.
Analysis of Adding Durian Skin Fiber as a Coarse Aggregate Additive in Concrete Arifin, Muhammad Fahmi; Prabowo, Yudi Setio; Mahendra, Muhammad Oka
Jurnal Teknik Sipil Vol 26, No 1 (2026): Jurnal Teknik Sipil Universitas Tanjungpura
Publisher : Fakultas Teknik Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/jts.v26i1.98769

Abstract

The extensive use of concrete has accelerated the depletion of natural aggregates and increased the accumulation of underutilized agricultural waste. Durian peel is a biomass residue with potential application in cement-based materials. This study investigates the feasibility of using untreated durian peel fiber as an additive to coarse aggregate in K-175 grade concrete. Unlike previous studies that primarily focus on chemically treated natural fibers, this research establishes the baseline performance of untreated durian peel fiber to identify its practical limitations. An experimental program was conducted using fibers sourced from Serang and Cilegon, Indonesia, processed through cleaning, cutting, and drying. Concrete mixtures were prepared with fiber contents of 0%, 2%, and 4% by weight of coarse aggregate. Twelve 150 mm cube specimens were tested for slump and compressive strength at curing ages of 3 and 7 days. Results indicate that increasing fiber content consistently reduced workability and compressive strength. At 7 days, compressive strength decreased from 5.40 MPa to 4.10 MPa and 2.15 MPa for 2% and 4% fiber additions, respectively. These findings confirm that untreated durian peel fiber is unsuitable for structural concrete but may be suitable for non-structural applications after material modification.
Evaluation of multimodal transportation integration facilities at Serang station Oktaviani, Anggun Nur; Mahendra, Muhammad Oka
Journal of Infrastructure Planning and Engineering 72-82
Publisher : Master Program of Infrastructure and Environmental Engineering, Postgraduate Program, Warmadewa University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22225/jipe.4.2.2025.72-82

Abstract

This study aims to evaluate the performance of multimodal transportation integration facilities at Serang Station, a major transportation hub in the Jakarta-Merak corridor serving 15,000 passengers per day. Key issues identified include fragmented pedestrian paths, a 450 m intermodal distance exceeding the 300 m TOD standard (SNI 03-7065-2005), limited covered waiting areas, and a lack of directional signs. This evaluation addresses the urgent need to improve travel efficiency and user satisfaction, contributing to sustainable urban development and reducing economic losses due to congestion. The Customer Satisfaction Index (CSI) was used to measure user perceptions of 16 facility attributes, and Importance-Performance Analysis (IPA) was used to prioritize improvements based on the gap between expectations and performance. The results showed very low levels of satisfaction with disabled access (CSI = 20%), lighting, zebra crossings, and bus stops (CSI = 20–46%), far below the average CSI of 52.52%, making them top priorities for improvement. Meanwhile, cleanliness, public restrooms, and gentle slopes meet user expectations. Recommendations include improved lighting, a microtransit hub within a 500-meter radius, additional trash bins, improved access for the disabled, improved markings/signage, and the construction of protected bus stops to support equitable, efficient, and sustainable urban mobility.
Modeling commuter mode shift to electric railway services: an integrated performance analysis and stated preference approach for the Rangkasbitung – Merak line Pratidina , Gineung; Mahendra, Muhammad Oka
Journal of Infrastructure Planning and Engineering 23-32
Publisher : Master Program of Infrastructure and Environmental Engineering, Postgraduate Program, Warmadewa University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22225/jipe.5.1.2026.23-32

Abstract

This study investigates the relationship between railway travel service characteristics and passenger demand on the Rangkasbitung – Merak commuter rail corridor. Secondary data on passenger volumes were obtained from PT Kereta Commuter Indonesia, while primary data were collected via on-board surveys conducted across multiple afternoon trips. Descriptive statistical analyses were performed to determine key performance indicators—namely load factor, travel time, dwell time, and commercial speed against established service standards. Subsequently, a binary logistic regression model was employed to assess the influence of travel cost and travel time on passengers’ likelihood to choose electric commuter services over conventional local trains. Results reveal an average load factor of 2.40, indicating the existing service capacity is frequently exceeded during peak periods. Average dwell times ranged between 2–5 minutes per station, and observed commercial speeds fell below the stipulated benchmark. Logistic regression analysis showed that travel cost (p = 0.316) did not exert a statistically significant effect on mode choice, whereas travel time emerged as a significant determinant: improvements in travel time increased the probability of passengers opting for electric commuter services by approximately 72.1%. These findings suggest that enhancing operational speed and optimizing station dwell times are critical to meeting passenger demand and improving overall service attractiveness on the Rangkasbitung – Merak route.
Co-Authors Arifin, Muhammad Fahmi Djuneydi, Muhammad Farihah, Iis Aisatul Irwan Mahendra, T.S. Hadi Oktaviani, Anggun Nur Prabowo, Yudi Setio Pratidina , Gineung Putra, Al Fiillian Sah Qishas, Haechal Fachar Refiza, Hazazil Zabila Saputro, Teguh Eko Sudianto, Toto