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Ibrahim, Zulfadli
Prodi Teknik Sipil Bangunan Gedung, Fakultas Teknik, Universitas Negeri Makassar, Indonesia
Agriculture, Biological Sciences & Forestry 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 Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mechanical Engineering Public Health Social Sciences Transportation Other

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Analisis Poisson Ratio dan Ketahanan Deformasi Campuran AC-WC Subtitusi Pasir Silika Ibrahim, Zulfadli; Said, Lambang Basri; Alifuddin, Andi
Jurnal Teknik Sipil MACCA Vol. 6 No. 1 (2021): Jurnal Teknik Sipil MACCA
Publisher : Universitas Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33096/x6z78m70

Abstract

Perkembangan wilayah dan kota di Indonesia terus meningkat sejalan dengan pertumbuhan transportasi sehingga menambah beban lalu lintas. Hal ini berimplikasi terhadap kerusakan perkerasan jalan. Penelitian terkait dilakukan untuk meningkatkan kinerja perkerasan jalan, salah satunya penggunaan material alternatif, yaitu pasir silika. Diharapkan pasir silika mampu meningkatkan kinerja dan ketahanan deformasi campuran AC-WC. Tujuan dari penelitian ini adalah untuk menganalisis pengaruh variasi pasir silika pada campuran AC-WC terhadap nilai poisson ratio dan tingkat ketahanan deformasi campuran. Pengujian dilakukan dengan alat uji Indirect Tensile Strength dan alat uji Wheel Tracking Machine. Dari hasil pengujian diperoleh nilai kuat tarik, poisson ratio, stabilitas dinamis, dan laju deformasi campuran ditunjukkan pada masing-masing variasi pasir silika dengan campuran KAO 5,8%, KAO Interval 4,8%, dan KAO Interval 6,8%. Nilai kuat tarik dan poisson ratio tertinggi ditunjukkan pada campuran KAO 5,8% dengan pasir silika 15% sebesar 83960,15 Kpa dan 0,721. Campuran dengan ketahanan deformasi terbaik ditunjukkan pada campuran pasir silika 15% dengan KAO 5,8%, dengan stabilitas dinamis (DS) tertinggi sebesar 750 lintasan/mm dan laju deformasi (RD) terendah sebesar 0,028 mm/menit.
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.
Sosialisasi dan Edukasi Keselamatan dan Kesehatan Kerja (K3) Konstruksi Sebagai Pencegahan Kecelakaan Dini pada Fresh Graduate Ibrahim, Zulfadli; Annisa, Humairah; Yunus, Ilham; Nur Afiah, Indah
Jurnal Pengabdian Kepada Masyarakat Vol. 1 No. 6 (2025): Jurnal Pengabdian Kepada Masyarakat
Publisher : CV. Era Digital Nusantara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59066/jpkm.v1i6.1733

Abstract

Tingginya angka kecelakaan kerja di sektor konstruksi menuntut peningkatan kesadaran dan kompetensi keselamatan sejak dini. Kegiatan sosialisasi dan edukasi Keselamatan dan Kesehatan Kerja (K3) bagi calon tenaga kerja konstruksi di Universitas Lamappapoleonro dilaksanakan sebagai upaya strategis membekali mahasiswa tingkat akhir (fresh graduate) dengan pemahaman dasar Keselamatan dan Kesehatan Kerja. Metode yang digunakan meliputi ceramah interaktif serta pre-test dan post-test untuk mengukur kognitif peserta dan efektivitas kegiatan. Hasil evaluasi menunjukkan peningkatan signifikan pada pemahaman peserta, dari rata-rata 76,10% menjadi 93,74%, dengan kenaikan 17,64%. Tiga indikator mencapai hasil sempurna (100%), yaitu kepanjangan K3, tujuan penggunaan alat pelindung diri (APD), dan penyebab utama kecelakaan kerja. Temuan ini menegaskan bahwa sosialisasi K3 efektif memperkuat kesadaran dan pemahaman calon tenaga kerja terhadap pentingnya penerapan K3, sekaligus menjadi langkah preventif membangun budaya keselamatan di dunia konstruksi.
Structural Response of a Reinforced Concrete Building to Earthquake Excitation: A Nonlinear Time-History Analysis Case Study in Palu, Indonesia Indah N. Afiah; Mohammad J. Rahman; Mentari S. Sitorus; Zulfadli Ibrahim
Journal of Civil Engineering Vol. 40 No. 3 (2025)
Publisher : Institut Teknologi Sepuluh Nopember (ITS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20861206.v40i3.9318

Abstract

Palu is one of the regions with high seismicity due to its location directly on the Palu-Koro Fault, the longest active fault in Indonesia. A post-earthquake structural response evaluation was conducted on a reinforced concrete office building in Palu, Indonesia, using nonlinear time-history analysis to assess its performance under seven recorded ground motions. This evaluation serves as a reference for determining the structural functionality, safety against collapse, and the need for structural reinforcement due to earthquake loads. The primary focus was to assess the serviceability limit state and ultimate limit state in accordance with SNI 1726:2019 and to determine the performance level category based on ATC-40. Modeling was conducted using ETABS software with input from earthquake accelerograms of the Superstition Hills, San Fernando, Kobe, Loma Prieta, El Centro, Caldiran, and Manjil earthquakes. The results show significant variations among the earthquake scenarios. The highest displacement and drift values occurred in the Y-direction due to the El Centro earthquake, while the lowest values were observed in the X-direction during the Caldiran earthquake. Only the Caldiran earthquake met the limit criteria in both directions. Based on ATC-40, three earthquakes (Caldiran, Loma Prieta, and San Fernando) reached the Immediate Occupancy (IO) and Life Safety (LS) levels. In comparison, the other four earthquakes showed levels exceeding Collapse Prevention (>CP), indicating potential building failure and high hazard risks. Therefore, further evaluation and retrofit recommendations are necessary to enhance the structure's capacity and stiffness, thereby achieving the desired performance level in all earthquake scenarios.
Co-Authors Afiah, Indah Nur Andi Alifuddin Annisa, Humairah Anwar, Andi Ratu ayuashari Ashabul Kahfi Susanto Basri, Muh. Subri Dewi Triantini Fitriyanti Humairah Annisa Indah N. Afiah Irawanda, Gita Ivan Fachrul Marsha Lambang Basri Said Lambang Basri Said Madiana Ali, Aisyah Marsa, Ivan Fachrul Mentari S Sitorus Misbahuddin, Azizah Fauziah Mohammad J. Rahman Muhammad Ihsan Zulfikar Muhibuddin, Andi Firman Muis, Ulmiah Nur Afiah, Indah Saragi, Alexander Adrian Shiber, Nahridzah Mahjubuh Syam, Sriwidayani Yunus, Ilham