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All Journal Justek : Jurnal Sains Dan Teknologi Jurnal Sains dan Teknologi JMTSS
Rajib Muammar
Universitas Samudra
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Dentistry Education Electrical & Electronics Engineering Energy Engineering Health Professions Industrial & Manufacturing Engineering Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Public Health Transportation Veterinary

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Stabilitas Lereng dengan Kombinasi Dinding Penahan Tanah (DPT) dan Tiang Pancang Berdasarkan Variasi Kedalaman Tiang Arissa Sabilla; Shafira Salsabila; Rajib Muammar; Ari Juanda; Rauzah Munauwarah
INSOLOGI: Jurnal Sains dan Teknologi Vol. 5 No. 3 (2026): Juni 2026
Publisher : Yayasan Literasi Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55123/insologi.v5i3.7974

Abstract

Slope stability is an important aspect in construction planning, especially in areas with weak soil conditions and high rainfall that have the potential to trigger landslides. This study aims to analyze the effect of variations in pile depth in combination with retaining walls (DPT) on increasing slope stability. The method used is numerical analysis using Plaxis software with a Mohr-Coulomb soil model based on secondary data of geotechnical parameters. The variations in pile depth described include 12 meters, 16 meters, 19 meters, and 20 meters. The results of the analysis show that the existing slope condition has a safety factor (SF) value of 1.270 and decreases to 1.064 after being given additional loads, which indicates unstable conditions. The application of DPT and pile reinforcement can significantly increase the SF value, with values ​​of 1.540 (12 m), 1.124 (16 m), 2.354 (19 m), and 2.450 (20 m), respectively. A depth of 19 meters is determined as the optimal condition because it provides a significant and efficient increase in stability. Thus, variations in pile depth have been shown to significantly impact slope stability and can be used as a reference in designing safe and economical slope reinforcement.
Mineral Content of Clay Soil and Coffee Husk Ash for Soil Stabilization Applications in Geotechnical Engineering Arissa Sabilla; Rajib Muammar; Ari Juanda
Justek : Jurnal Sains dan Teknologi Vol 8, No 4 (2025): December
Publisher : Unversitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/justek.v8i4.35345

Abstract

This study aims to analyze the mineral composition of clay soil and coffee husk ash, as well as to evaluate the effect of coffee husk ash as a stabilizing agent for clay soil. The main problem addressed is the high plasticity of clay soil, which causes volume changes and reduces bearing capacity, making stabilization methods necessary. The research was conducted by collecting clay soil samples from Kebun Kurma Barbate, Aceh Besar, and coffee husk ash from Aceh Tengah. Mineral composition was analyzed using gravimetric, titrimetric, spectrophotometric, and AAS methods, while soil plasticity was examined through Atterberg limits and specific gravity tests. The results indicate that clay soil contains dominant Silica Oxide (SiO₂) at 42.99% and Aluminum Oxide (Al₂O₃) at 5.63%, contributing to its high plasticity. Meanwhile, coffee husk ash contains 8.30% SiO₂ and 5.22% Calcium Oxide (CaO), which play crucial roles in stabilization. The addition of 5– 25% coffee husk ash reduced the plasticity index from 38.42% to 34.29%, increased soil specific gravity from 2.587 g/cm³ to 2.690 g/cm³, and transformed soil classification from clay to silt. These findings confirm the potential of coffee husk ash as an effective, and sustainable stabilizing material for geotechnical engineering applications
Analysis of Heavy Equipment Productivity in the Jalan Rel Kota Langsa Reconstruction Project Rajib Muammar; Iqbal Iqbal
Justek : Jurnal Sains dan Teknologi Vol 8, No 4 (2025): December
Publisher : Unversitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/justek.v8i4.35015

Abstract

The quality of the road produced during the reconstruction of Jalan Rel Kota Langsa is directly dependent on the materials used, the operators, and the application of heavy equipment. Errors in heavy equipment selection will lead to low productivity. This study aims to determine the productivity levels and the required duration for each piece of equipment to complete the Langsa City Road Reconstruction project. This research employs the Bina Marga method with a quantitative approach. The analysis results show that the productivity of heavy equipment for Aggregate Base Class A (LPA) work is as follows: dump trucks = 386.352 m³/day, motor graders = 617.143 m³/day, vibrator compactor rollers = 804.270 m³/day, and water tanks = 498 m³/day. For prime coat work: air compressors = 3486 m²/day and asphalt distributors = 647.089 liters/day. For Asphalt Concrete-Binder Course (AC-BC) work: dump trucks = 172.148 m³/day, asphalt finishers = 804.270 tons/day, tandem rollers = 401.017 m³/day, and pneumatic tire rollers = 365.776 m³/day. The duration required for heavy equipment execution is 2 days for LPA work, 1 day for prime coat work, and 2 days for AC-BC work.
PENILAIAN KERENTANAN SEKTOR KONSTRUKSI PASCA BENCANA BANJIR SEBAGAI DASAR STRATEGI PENGURANGAN RISIKO BENCANA GEMPA BUMI DI KOTA LANGSA, ACEH Ari Juanda; rajib muammar; arissa sabilla; haikal fajri
Jurnal Media Teknik Sipil Samudra Vol 7 No 1 (2026): April 2016
Publisher : Program Studi Teknik Sipil, Fakultas Teknik. Universitas Samudra

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Langsa City, Aceh, is an area prone to both flooding and earthquakes. Recurrent flooding can deteriorate building conditions, including foundation damage, wall cracking, material degradation, and reduced structural performance, which may increase vulnerability to future earthquake events. This study aims to assess the vulnerability of the construction sector following flood disasters as a basis for developing earthquake risk reduction strategies in Langsa City. A descriptive qualitative approach was employed using field observations and in-depth interviews. The collected data were analyzed through thematic analysis based on three dimensions: technical, socio-cultural, and political-economic aspects. The findings reveal that construction sector vulnerability in Langsa City is multidimensional. From the technical aspect, vulnerability is associated with material deterioration, wall cracks, and inadequate drainage systems. From the socio-cultural aspect, limited public awareness of earthquake-resistant construction practices and reliance on traditional building experience contribute to increased vulnerability. From the political-economic aspect, financial constraints, unequal distribution of rehabilitation assistance, and weak construction oversight further exacerbate risks. The study concludes that reducing earthquake vulnerability in post-flood areas requires integrated efforts, including structural strengthening, drainage improvement, community education on disaster-resilient construction, and the incorporation of flood and earthquake risk considerations into local development policies.
Co-Authors Ari Juanda Arissa Sabilla Haikal Fajri Iqbal Iqbal Rauzah Munauwarah Shafira Salsabila