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All Journal Jurnal Ilmiah Giga Jurnal Teknik Sipil JOURNAL OF CIVIL ENGINEERING, BUILDING AND TRANSPORTATION Buletin Sumber Daya Geologi Jurnal Ulul Albab SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan Civil and Environmental Science Journal (CIVENSE) Jurnal Pembelajaran Pemberdayaan Masyarakat (JP2M) Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Rengganis Jurnal Pengabdian Masyarakat Prosiding Seminar Nasional Teknik Sipil UMS Innovative: Journal Of Social Science Research Aksi Kita: Jurnal Pengabdian Kepada Masyarakat
Heni Pujiastuti
Program Studi Teknik Sipil, Fakultas Teknik, Universitas Muhammadiyah Mataram Jl. KH. Ahmad Dahlan No.1 Pagesangan Mataram NTB.
Agriculture, Biological Sciences & Forestry Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Energy Engineering Environmental Science Health Professions Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Mathematics Medicine & Pharmacology Nursing Physics Public Health Social Sciences Other

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Evaluation of Clayey Sand Subgrade Bearing Capacity Using Soaked and Unsoaked CBR Tests Fina Afrilia Cahyaning; Heni Pujiastuti; Anwar Efendy; Ahmad Zarkasi
JOURNAL OF CIVIL ENGINEERING BUILDING AND TRANSPORTATION Vol. 10 No. 2 (2026): JCEBT SEPTEMBER
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jcebt.v10i2.17859

Abstract

This study evaluates the bearing capacity of highway subgrade through laboratory California Bearing Ratio (CBR) testing under soaked and unsoaked conditions. The research aims to determine the physical characteristics, compaction properties, and bearing capacity of clayey sand subgrade collected from Sepi Highway, West Lombok, Indonesia. Laboratory tests were conducted in accordance with the relevant Indonesian National Standards (SNI), including soil classification, Standard Proctor compaction, and CBR testing. The soil was classified as clayey sand (SC) based on the Unified Soil Classification System (USCS) and as A-2-7 according to the AASHTO classification system. The maximum dry density and optimum moisture content were 1.390 g/cm³ and 27.782%, respectively. The unsoaked CBR value reached 6.674%, whereas the soaked CBR value decreased significantly to 3.115%, indicating a substantial reduction in bearing capacity under saturated conditions. These findings demonstrate that water saturation is the primary factor reducing subgrade performance. Therefore, chemical stabilization, soil replacement, geotextile reinforcement, and improved drainage are recommended to enhance pavement stability and prolong highway service life.
Effect of Moisture Content on California Bearing Ratio of Subgrade at a Road Settlement Area Fitriana; Heni Pujiastuti; Ahmad Zarkasi
JOURNAL OF CIVIL ENGINEERING BUILDING AND TRANSPORTATION Vol. 10 No. 2 (2026): JCEBT SEPTEMBER
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jcebt.v10i2.18604

Abstract

Road subgrade performance is strongly influenced by moisture conditions because changes in water content can alter soil density, strength, and bearing capacity. This study investigated the effect of moisture conditions on the California Bearing Ratio (CBR) of subgrade soil collected from a road settlement area in Dopang Village, Gunungsari District, West Lombok Regency, Indonesia. A laboratory experimental method was employed, including natural moisture content, specific gravity, particle-size distribution, Atterberg limits, Standard Proctor compaction, and CBR testing under unsoaked and 96-hour soaked conditions. The soil had a natural moisture content of 38.90%, specific gravity of 2.70, 26.30% material passing the No. 200 sieve, liquid limit of 31.41%, plastic limit of 21.81%, and plasticity index of 9.60%. The Standard Proctor test produced an optimum moisture content of 18.33% and a maximum dry density of 1.365 g/cm³. The CBR value decreased from 8.142% in the unsoaked condition to 3.392% after soaking, representing a reduction of approximately 58.3%. The results demonstrate that water saturation substantially reduces subgrade bearing capacity. The findings indicate that moisture control, adequate drainage, and appropriate subgrade improvement are essential for reducing the risk of recurrent road settlement at the study location.
Co-Authors Abdul Radjak Acop Firmansyah Adryan Fitrayudha Ahmad Zarkasi Ahmad Zarkasi Ahmad Zarkasi Aji Syailendra Ubaidillah Amaelisa, Viara Andi Faesal Andi Faesal Anwar Efendy Ari R. Hidayat Arief Rachman Hakim Aryaumul Patriani Aulia Muttaqin Bandu, Andi Rachman Chairil Anhar Cita Santuni Dodik Kusumawanto Dwi Winarti Erni Yustissiani Faesal, Andi Fariyadin, M. Ruslin Anwar, Indradi Wijatmiko, Adiman Feri Irawan Fina Afrilia Cahyaning Fitrayuda, Adryan Fitriana Hadi Rasikhun Hafiz Hamdani Hafiz, Syaepudin Haidir Azim Hamdani, Hafiz Haryadi, Febrian Ekasapta Intan Novianti Isfanari Isfanari Isfanari Isfanari Iwan Dermawan Iwan Dermawan Iwan Dermawan Khatib Syarbini Kusnadi Kusnadi M. Khalis Ilmi Maya S. Pascanawati Maya Saridewi Pascanawati Maya Saridewi Pascanawaty Melinda Dwi Erintina Melinda Dwi Erintina Muhammad Deni Kurniawan Nani Sulistianingsih Ngudiyono Ngudiyono Nurul Hidayati Nurul Hidayati Partono, Agus Pascanawati, Maya Saridewi Radjak, Abdul Rajabi Mubarak Ringgi P. Samengasbumi Roihan, Adam Rozi, Muhammad Fahrul Savana P. Balqis Suhendri Suhendri Swahip Swahip Syamsul Hidayat Syarbini, Khatib Syarifunnaji Ridho Titik Wahyuningsih Ubaidillah, Aji Syailendra Urifah, Dewi Wahyu Hermansyah Wahyu Hermansyah Z.A Munarfan Putra