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All Journal J-Sil (Jurnal Teknik Sipil dan Lingkungan) Journal Industrial Servicess Journal of the Civil Engineering Forum Civil Engineering Dimension Publikasi Riset Orientasi Teknik Sipil (Proteksi) J-Sil (Jurnal Teknik Sipil dan Lingkungan)
Tri Sudibyo
Institut Pertanian Bogor
Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Engineering Environmental Science Industrial & Manufacturing Engineering Mechanical Engineering Transportation

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The Basic Rheological Properties of LDPE Modified Bitumen Sudibyo, Tri; Suwarto, Fardzanela; Fauzan, Muhammad; Arif, Chusnul
Jurnal Teknik Sipil dan Lingkungan Vol. 9 No. 2: Oktober 2024
Publisher : Departemen Teknik Sipil dan Lingkungan IPB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jsil.9.2.275-282

Abstract

Various polymers have widely known in its capability in enhancing rheological properties of bitumen for various pavement applications. Many polymer types have been used in studies, where the properties of the final product of the polymer modified bitumen (PMB) are different, depending on the used polymers. LDPE or Low-Density Polyethylene are one of widely studied polymers in bitumen modification that exhibit higher bitumen's viscosity, perform better in resisting deformation under heavy loads, and tend to show better integrity in high temperatures. LDPE-modified bitumen also believed to enhance elasticity, allowing a potentially better resistance to cracking due to ability to recover at low strain. Many studies also stated the improvement of LDPE-modified bitumen against thermal and mechanical stress, better adhesion to aggregates in asphalt mixtures, and various promising result for overall durability and longevity of pavement. This study explains basic rheological properties of LDPE-modified bitumen prepared by high shear mixing and specified preparing methodologies. Five variables of %modifications were used: 2%, 4%, 6%, 8% and 10% of bitumen weight. Ring and Ball softening point, Penetration test and rotating spindle viscometry were done to understand the rheological changes of the modified bitumen compared to unmodified bitumen control. For further understanding the behaviour, two types of LDPE were used: virgin LDPE and recycled LDPE. The study shows interesting noticeable differences between the two used LDPE polymers, allowing further proposed studies in this field.
Analisis Siklus Hidup pada Campuran Aspal dengan Reclaimed Asphalt Pavement Dengan Metode Life Cycle Asessment Suwarto, Fardzanela; Sudibyo, Tri
Jurnal Teknik Sipil dan Lingkungan Vol. 9 No. 2: Oktober 2024
Publisher : Departemen Teknik Sipil dan Lingkungan IPB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jsil.9.2.315-326

Abstract

Penelitian ini mengevaluasi dampak lingkungan dari penggunaan Reclaimed Asphalt Pavement (RAP) dalam campuran aspal dengan metode Life Cycle Assessment (LCA). Variasi RAP mulai dari 0% hingga 50% dianalisis terhadap 18 kategori dampak, termasuk Global Warming, Water Consumption, dan Resource Scarcity. Hasil menunjukkan bahwa RAP mengurangi Mineral Resource Scarcity hingga 37,1%, Land Use 35,2%, dan Water Consumption sebesar 26,2%, dengan kontribusi terbesar berasal dari pengurangan penggunaan material baru. Namun, RAP meningkatkan dampak pada Terrestrial Ecotoxicity akibat konsumsi energi yang lebih tinggi pada fase pencampuran. Penelitian ini mendukung penggunaan RAP untuk meningkatkan keberlanjutan infrastruktur jalan dengan optimasi proses pencampuran untuk meminimalkan dampak negatif.
Mapping of Road Pavement Conditions on the Cikampak Cicadas to the Segog Pamijahan Road Section Rantelino, Owen; Suharnoto, Yuli; Sudibyo, Tri; Sutoyo
Jurnal Teknik Sipil dan Lingkungan Vol. 10 No. 1: April 2025
Publisher : Departemen Teknik Sipil dan Lingkungan IPB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jsil.10.1.97-106

Abstract

Roads are one of the land transportation infrastructures that have a vital role in supporting community activities. Road damage is often encountered in various places. If left unchecked, handling road damage will cost a lot. The purpose of this study is to identify the type and extent of damage from road pavement and drainage in the study area, as well as determine handling recommendations for road pavement using the Bina Marga method. The method used is the Bina Marga method and the main output of this method is the value of the Priority Order (UP) and the recommendation for handling the observed road. The results of the study showed that the most common type of damage encountered at the study site was elongated cracks with a total area of 582.44m2, and lateral cracks were damages with the smallest total area, which was 6.27 m2. The value of road condition obtained from summing the number of damage in each segment showed that the condition value of 7 was mostly owned by the road segments at the research site, namely 18 segments, while the condition values 3 and 6 were only owned by 1 segment. Recommendations for handling the east side drainage were obtained as a result that 27 segments require routine maintenance, 18 segments require periodic maintenance and 10 segments require addition to the drainage system. The drainage on the west side was obtained as a result of 35 road segments requiring routine maintenance, 14 road segments requiring periodic maintenance and 6 road segments requiring addition to the drainage system. The recommendations for handling on the road were obtained as a result that 10 road segments require routine maintenance, 26 road segments require periodic maintenance and 19 road segments require improvement with the required handling costs of Rp 39,857,105, Rp 302,529,219 and Rp 1,719,020,425 respectively.
Design of Gate 4 at IPB University and the Babakan Raya-Dramaga Road intersection to improve traffic performance of the campus’s external area Muhamad Adlijil Ikram; Sudibyo, Tri
Jurnal Teknik Sipil dan Lingkungan Vol. 10 No. 1: April 2025
Publisher : Departemen Teknik Sipil dan Lingkungan IPB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jsil.10.1.65-76

Abstract

Population growth and increased mobility in the area surrounding IPB University, particularly along Raya Dramaga Road and the Babakan Raya intersection have led to severe congestion. This intersection serves as a critical point where vehicle accumulation frequently occurs due to crossing movements, particularly during morning and evening peak hours. The majority of vehicles involved in these crossings are motorcycles owned by IPB students heading toward the university’s main gate. Therefore, effective measures or policies are required to reduce crossing movements during peak hours, such as redirecting a portion of student traffic to alternative gates to alleviate congestion at Babakan Raya intersection. This study aims to identify traffic volume, road and intersection capacity, and the actual intersection performance, design an optimal Gate 4 for IPB, and analyze its impact on traffic performance. The research methodology includes primary and secondary data collection, intersection performance analysis, and the design of a roundabout and intersection improvements based on PKJI 2023 standards and Transportation Ministerial Regulation No. 96 of 2015. The study findings indicate that widening minor approach lanes, constructing traffic islands, and eliminating side friction increase the capacity of Babakan Raya intersection from 2,985.32 PCU/hour to 3,413.88 PCU/hour. The degree of saturation decreases from 1.22 to 0.87, and intersection delay is significantly reduced from 46 seconds/PCU to 14 seconds/PCU, improving the level of service (LoS) from category E (poor) to B (good). The construction of Gate 4 at IPB successfully redirects vehicle flow, particularly motorcycles, which previously traversed Babakan Raya intersection to access Gate 1 of IPB. With a capacity of 2,149 PCU/hour, the Gate 4 roundabout effectively accommodates high vehicle volumes during peak hours. Traffic performance analysis results demonstrate that intersection improvements and the development of Gate 4 at IPB effectively enhance traffic performance in the external area of IPB, mitigate congestion, and improve vehicular movement efficiency.
Analysis of Landslide Vulnerability and Its Impact on Population and Infrastructure Exposure in Central Bogor District Using AHP and Open Geospatial Data Vincent, Vincent; Ramadhanis, Zainab; Sutoyo, Sutoyo; Suharnoto, Yuli; Sudibyo, Tri
Jurnal Teknik Sipil dan Lingkungan Vol. 10 No. 2: October 2025
Publisher : Departemen Teknik Sipil dan Lingkungan IPB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jsil.10.2.287-296

Abstract

Indonesia’s location at the convergence of three active tectonic plates makes it highly susceptible to various natural disasters, with landslides being among the most frequent and destructive, particularly in mountainous and densely populated urban areas. Central Bogor District in West Java represents a vulnerable area where steep topography, high rainfall intensity, and dense population heighten landslide risk. Despite recurrent landslide events, comprehensive vulnerability assessments integrating both physical and socio-environmental factors remain limited. This study aims to produce a spatially explicit landslide vulnerability map for Central Bogor District by utilizing open geospatial data and applying a GIS-based multi-criteria decision-making approach. The Analytical Hierarchy Process (AHP) was employed to assign weights to four primary physical parameters—rainfall, slope, lithology, and land cover—based on their relative contribution to landslide susceptibility. Supporting data were derived from Sentinel-1A imagery (InSAR), Landsat-8 classification, CHIRPS precipitation records, and official geological maps. These physical layers were then integrated with exposure indicators, including population density, infrastructure distribution, and accessibility data from OpenStreetMap. The results delineated three landslide vulnerability zones: high (49.87 ha), moderate (481.82 ha), and low (236.45 ha). High-risk zones, such as Gudang and Paledang Sub-districts, feature steep slopes, weak geological formations, and dense settlements. Overlay analysis also revealed a significant concentration of critical infrastructure within moderate-to-high vulnerability zones, highlighting exposure and potential service disruption during hazard events. The study underscores the critical value of combining open geospatial data with AHP-based weighting to inform targeted disaster mitigation, infrastructure planning, and resilient urban development. The resulting maps can guide policy and preparedness strategies to reduce landslide impacts in high-risk urban areas.
Analysis and Performance Improvement of a Four-Leg Unsignalized Intersection (Case of study: Duta Berlian Intersection, Dramaga, Bogor) Fatoni, Ahmad; Sudibyo, Tri; Apriadi; Fauzan, Muhammad
Jurnal Teknik Sipil dan Lingkungan Vol. 10 No. 2: October 2025
Publisher : Departemen Teknik Sipil dan Lingkungan IPB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jsil.10.2.297-306

Abstract

The Duta Berlian intersection near IPB University, Dramaga, Bogor experiences severe traffic congestion due to traffic volumes exceeding its capacity, high roadside friction, and the absence of traffic light. This study aims to evaluate the performance of the existing intersection and assess several improvement scenarios to improve intersection’s capacity and level of service (LOS). Traffic volume surveys were carried out using the Classified Turning Movement Counting (CTMC) method during morning and evening peak hours, followed by analysis of capacity, degree of saturation (DS), delay, and queue probability calculations. The 2023 Indonesian Highway Capacity Manual (PKJI 2023) and Ministry of Transportation Regulation No. 96/2015 were used as the analysis method and LOS classification. The analysis showed that the existing condition has DS of 1.08, average delay of 23.3 sec/PCU, queue probability of 93.23%, and LOS C. Four scenarios were tested: approach widening, conversion to a signalized intersection, application of a four-phase signal with right-turn separation, and addition of a left turn on red (LTOR) lane. The optimal scenario combined a minimum widening of 2 m with a four-phase signal and LTOR, reducing DS to 0.70, delay to 12–15 sec/PCU (LOS B), and potentially decreasing accident rates by 20–50%. In conclusion, conversion to a signalized intersection with geometric redesign and traffic flow management significantly improves intersection performance and is recommended to be equipped with yellow box junctions, markings, and signage as a medium-term solution. For a long-term solution, a grade-separated intersection is recommended.
Co-Authors Ahmad Fatoni Apriadi, Apriadi Apriliyanto, Rangga Ardiansyah, Rahmat Chusnul Arif Dhia Kamal Irfan Dwi Bangkit Prakoso Dzaky Syifaurrahman Erizal , Erizal . Erizal Erizal Fitri Rohmah Widayanti Hideaki Yasuhara Imam Muthohar Irfan, Dhia Kamal Khuswatun Chasanah Khuswatun Chasanah, Khuswatun Listiana, Novi Mentari, Sekar Muhamad Adlijil Ikram Muhammad fauzan Muhammad Fauzan Naoki Kinoshita Nidea Novitasari Novi Listiana Novitasari, Nidea Prakoso, Dwi Bangkit Purnama, Satya Adi Purwo Mahardi Putra, Heriansyah Rahmat Ardiansyah Ramadhan, Fathur Ramadhanis, Zainab Rangga Apriliyanto Rantelino, Owen Satya Adi Purnama Simanjorang, Bernando Agung Saputra Sutoyo Sutoyo Sutoyo Sutoyo Suwarto, Fardzanela Syifaurrahman, Dzaky Vincent Vincent, Vincent