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All Journal JeLAST : Jurnal Teknik Kelautan , PWK , Sipil, dan Tambang Jurnal Teknik Sipil Literasi: Jurnal Pengabdian Masyarakat dan Inovasi TEKSTUR : Jurnal Teknologi Infrastruktur
Parabi, Ashraf Dhowian
University Of Tanjungpura
Civil Engineering, Building, Construction & Architecture Environmental Science Public Health Transportation Other

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Journal : Jurnal Teknik Sipil

 1 
Evaluation of Circular Buffer and Service Area Buffer Methods in Accessibility Analysis of Trans Metro Bandung Route 1 Based on GIS Adibah, Fairuz; Saputra, Doddy Cahyadi; Sugasta, Hervian Handika; Parabi, Ashraf Dhowian; Santosa, Dimas Puji
Jurnal Teknik Sipil Vol 25, No 4 (2025): Jurnal Teknik Sipil: Vol 25, No. 4, November 2025
Publisher : Fakultas Teknik Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/jts.v25i4.93056

Abstract

This study examines public transportation accessibility in Bandung, the capital of West Java Province, located at 107 °36' E and 6 °55' S, covering 167.31 square kilometers and characterized by a mountainous "bowl-shaped" topography. Trans Metro Bandung (TMB) operates an integrated network of five main corridors and two feeder routes to enhance urban mobility. Corridor 1, the longest route, spans approximately 20 kilometers from Cibiru Terminal in the east to Cibeureum Terminal in the west, passing through major roads and serving 86 bus stops distributed across educational, commercial, office, and residential areas. The study utilizes secondary spatial data, including Bandung"™s road network and bus stop locations from the Trans Metro Bandung. Administrative boundary data delineates the study area. Using GIS software, the research compares two accessibility measurement methods: the circular buffer, which creates fixed-radius catchment areas around stops, and the service area buffer, which calculates accessible areas based on the actual street network. Both buffer types are merged to remove overlapping areas, producing union buffers representing unique coverage zones. Accessibility indices are calculated based on the union buffers: the Ideal Stop-Accessibility Index (ISAI) measures the ratio of circular buffer coverage to the ideal corridor buffer; the Actual Stop-Accessibility Index (ASAI) measures the ratio of service area buffer coverage to the ideal; and the Stop Coverage Ratio Index (SCRI) compares service area coverage to circular buffer coverage. These indices prevent overestimation caused by overlapping buffers and provide a realistic assessment of transit stop accessibility. This study provides valuable insights for developing more accurate and sustainable public transportation strategies in Bandung and similar urban contexts.
Experimental Study of The Effect of Activator Molarity on The Compressive Strength of Fly Ash-Based Geopolymer Concrete from Bengkayang Regency Power Plant Faraid, Luthi Armey; Herwani, Herwani; Faisal, Faisal; Parabi, Ashraf Dhowian
Jurnal Teknik Sipil Vol 24, No 4 (2024): Vol 24, No 4 (2024): JURNAL TEKNIK SIPIL EDISI NOVEMBER 2024
Publisher : Fakultas Teknik Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/jts.v24i4.88329

Abstract

Geopolymer concrete is a form of concrete where Portland cement is substituted with alternative materials like fly ash, rice husk ash, and other silica- and aluminum-rich sources as binders. The research employed an experimental method by preparing geopolymer concrete test specimens using fly ash, NaOH solution, Naâ‚‚SiO₃, fine aggregate, and coarse aggregate. Tests conducted included physical properties (slump test and unit weight) and mechanical properties (compressive strength, split tensile strength, and modulus of elasticity). The results showed a slump range of 130"“190 mm, an average unit weight between 2249.39 kg/m ³ and 2336.39 kg/m ³, a 28-day average compressive strength between 12.32 MPa and 15.92 MPa, an average split tensile strength between 1.46 MPa and 1.56 MPa, and an average modulus of elasticity (Chord Modulus) between 3011.67 MPa and 3881.8 MPa. The optimal variation was achieved with an NaOH solution concentration of 10 M, resulting in a slump of 160 mm, a 28-day average compressive strength of 15.92 MPa, an average split tensile strength of 1.56 MPa, and an average modulus of elasticity (Chord Modulus) of 3881.48 MPa. Therefore, fly ash-based geopolymer concrete demonstrates potential as a viable substitute for cement as a binder material.
Effect of Activator Age on Fly Ash-Based Geopolymer Concrete Hutajulu, Jacob Hasiholan; Faisal, Faisal; Herwani, Herwani; Parabi, Ashraf Dhowian
Jurnal Teknik Sipil Vol 25, No 1 (2025): Vol 25, No 1 (2025): JURNAL TEKNIK SIPIL EDISI FEBRUARI 2025
Publisher : Fakultas Teknik Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/jts.v25i1.88409

Abstract

Geopolymer concrete is a sustainable alternative that replaces Portland Cement (PC) with fly ash. This research aims to analyze the mechanical properties of geopolymer concrete with variations in NaOH solution aging. An experimental method was applied through a series of tests, including slump, compressive strength, split tensile strength, and modulus of elasticity. The results indicate that the slump value ranges from 9,5 cm to 15,5 cm. The bulk density of geopolymer concrete varies between 2.313,052 Kg/m ³ and 2.387,324 Kg/m ³. The maximum compressive strength at 28 days was achieved after a 24-hour NaOH curing period, reaching 15,915 MPa, whereas the minimum strength of 10,186 MPa was observed with no curing time. The highest split tensile strength was observed at 24 hours (1,556 MPa), whereas the lowest occurred at 0 hours (1,085 MPa). Using the Chord Modulus method, the modulus of elasticity reached its highest value at 24 hours (3.625,261 MPa) and its lowest at 48 hours (2.152,499 MPa). Thus, this research concludes that a 24-hour NaOH curing period results in geopolymer concrete with optimal compressive strength and mechanical properties.
Co-Authors Adibah, Fairuz Aprillia, Ricka Aryanto, - Cahyadi Saputra, Doddy Dimas Puji Santosa Doddy Cahyadi Saputra Elvira, - Fadil Iqbal, Muhammad Faisal Faisal Faraid, Luthi Armey Herwani . Hutajulu, Jacob Hasiholan Ira, Nurmaya Putri Mukti, Plasma Versiana NIM. A1011141008, YULIANA Octaviyana, Rickhy Artha Octaviyana, Ricky Artha Parabi, Arif Serera, Aulia Yuti Siti Aisyah Sugasta, Hervian Handika Wahdaniah Mukhtar Yufiansyah