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All Journal Journal of Civil Engineering PINISI Discretion Review TEKIBA : Jurnal Teknologi dan Pengabdian Masyarakat Seminar Nasional Pengabdian Kepada Masyarakat Jurnal Teknik Sipil Macca JTEKSIL Jurnal Kemitraan Masyarakat
Ibrahim, Zulfadli
Prodi Teknik Sipil Bangunan Gedung, Fakultas Teknik, Universitas Negeri Makassar, Indonesia
Humanities Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Public Health Social Sciences Transportation

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Investigation of the Plasticity and Bearing Capacity of Beach Sand-Stabilized Clay under Different Soaking Durations Annisa, Humairah; Ibrahim, Zulfadli; Yunus, Ilham; Fitriyanti; Basri, Muh. Subri
Jurnal Teknik Sipil MACCA Vol. 10 No. 3 (2025): Jurnal Teknik Sipil MACCA (OKTOBER 2025)
Publisher : Universitas Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33096/an4yb773

Abstract

Clay soils are widely recognized for their unfavorable geotechnical properties, including high plasticity and low bearing capacity, which often compromise the performance of subgrades and foundations. Conventional stabilizers such as cement and lime are effective but limited by cost and environmental concerns. Beach sand with its non-plasticity, density, and high internal friction angle, offers potential as a natural stabilizer. This study investigates the stabilization of clay soil using Kupa beach sand (KBS) under various soaking durations. The evaluation focuses on compaction and CBR tests to determine the bearing capacity, as well as Atterberg limit tests to assess the plasticity of the stabilized samples. The findings show that incorporating 30% Kupa beach sand optimally improves engineering properties, reducing the Plasticity Index (PI) from 40,94% to 6,18% and significantly increasing CBR value from 7,638% (KBS0%) to 38,227% (KBS30%) under unsoaked conditions. Although prolonged soaking reduced CBR values due to weakened particle bonding, the stabilized mixture retained higher CBR value (20,672%) than untreated clay (3,546%) after 21 days, indicating durability under saturated conditions. These results confirm that beach sand effectively decreases plasticity, enhances strength, and mitigates moisture susceptibility.
Identification of Swelling Potential in Low-Plasticity Clay Soil Using the Free Swell Index Method Yunus, Ilham; Zulfadli Ibrahim; Humairah Annisa; Indah Nur Afiah; Mentari S. Sitorus
Jurnal Teknik Sipil MACCA Vol. 11 No. 1 (2026): Jurnal Teknik Sipil MACCA (FEBRUARI 2026)
Publisher : Universitas Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33096/mqe5m837

Abstract

Expansive behavior of clay soil poses potential risks to geotechnical structures due to volume changes caused by water absorption. Although low plasticity clay (CL) generally exhibits lower swelling potential than highly plastic clay, its swelling characteristics still require evaluation. This study investigates the swelling potential of low plasticity clay using the Free Swell Index (FSI) method. The clay soil sample was obtained from an embankment material of a road project along the Tello River, Makassar. Basic physical properties were determined through laboratory testing, including grain size distribution and Atterberg limits, to classify the soil based on the Unified Soil Classification System (USCS). The FSI test was conducted by comparing soil volume changes in distilled water and kerosene. The results indicate that the soil is classified as CL with a plasticity index of 16% and a liquid limit of 38%. The measured FSI values range from 19% to 52.5%, with most samples exhibiting very low to low swelling potential, and only one sample showing moderate swelling. These findings confirm that low plasticity clay has limited swelling potential and that FSI is one of effective method for determining swelling behavior in CL soils for geotechnical applications.
The Effect of Steel Fiber Content on The Splitting Tensile Strength of Steel Fiber Reinforced Concrete (SFRC) Mentari S. Sitorus; Indah N. Afiah; Zulfadli Ibrahim; Andi Firman Muhibuddin
Journal of Civil Engineering Vol. 40 No. 2 (2025)
Publisher : Institut Teknologi Sepuluh Nopember (ITS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20861206.v40i2.7249

Abstract

Concrete is a composite material consisting of two main components namelyaggregate and cement mortar as a binder. Concrete has high compressive strengthbut weak tensile strength. The addition of fiber in concrete can improve ductilebehavior before collapse, inhibit the growth of crack expansion and increasedurability. This study aims to examine the effect of fiber content on themechanical properties of fiber concrete. The fibers used were ssteel fibers withhooked end, and l/d ratio = 67,7 mm with normal concrete quality f’c = 25 MPa.The percentage of fiber content used in this study was 0%, 0,1%, 0,2%, 0,3%,0,5%, 0,75%, 1%, 1,5% and 2%. The results showed that the addition of fiber inconcrete was able to increase the split tensile strength by 7 – 117%. Fiber concretehas higher ductility than normal concrete. This is indicated by the high deflectionof fiber concrete compared to the deflection of normal concrete under load.
Co-Authors Andi Alifuddin Annisa, Humairah Ashabul Kahfi Susanto Basri, Muh. Subri Dewi Triantini Fitriyanti Humairah Annisa Indah N. Afiah Indah Nur Afiah Ivan Fachrul Marsha Lambang Basri Said Lambang Basri Said Madiana Ali, Aisyah Marsa, Ivan Fachrul Mentari S Sitorus Muhammad Ihsan Zulfikar Muhibuddin, Andi Firman Muis, Ulmiah Saragi, Alexander Adrian Shiber, Nahridzah Mahjubuh Yunus, Ilham