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All Journal MEDIA KOMUNIKASI TEKNIK SIPIL Sinergi Semesta Teknika Adimas : Jurnal Pengabdian Kepada Masyarakat Abdimas Umtas : Jurnal Pengabdian kepada Masyarakat TRIDARMA: Pengabdian Kepada Masyarakat (PkM) DedikasiMU: Journal of Community Service Bulletin of Civil Engineering Prosiding Seminar Nasional Program Pengabdian Masyarakat Journal of the Civil Engineering Forum
Willis Diana
Universitas Muhammadiyah Yogyakarta
Religion Agriculture, Biological Sciences & Forestry Arts Humanities Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Mathematics Medicine & Pharmacology Social Sciences

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Journal : Journal of the Civil Engineering Forum

 1 
Effect of the Specimen’s Height on the Split-Tensile Strength of the Fibers Reinforced Clay-Lime-Rice Husk Ask Mixture Hartono, Edi; Muntohar, Agus Setyo; Diana, Willis; Hemeto, Abd. Dzargifar
Journal of the Civil Engineering Forum Vol. 10 No. 2 (May 2024)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jcef.11305

Abstract

Various studies on the effect of specimen size on splitting tensile strength. However, geotechnical codes lack consensus regarding the recommended specimen diameter and height-to-diameter (H/D) ratio for the split tensile strength test. Hence, it is imperative to study the effect of the height-to-diameter ratio of the specimen on the outcomes of the split tensile strength test, especially for stabilized and fiber-reinforced soil. This research examines the effect of adding lime-rice husk ash and plastic fiber and the effect of specimen size on splitting tensile strength. The height of the specimen is varied, using a height-to-diameter ratio (H/D), namely 0.5, 1.0, 1.5, 2.0, and 2.5, in which the diameter is 70 mm. Two groups of specimens were prepared as stabilized clay without fibers and stabilized clay with 0.1% fibers. The lime required for stabilization is 10% of the dry weight of the soil. In this research, the lime and rice husk ash ratio was designed as 1:1. The splitting tensile strength test was carried out after the specimen was cured for seven days. The investigation indicates that the splitting tensile strength of the specimen without fibers reduces from 217 kPa to 150 kPa as the H/D ratio grows from 0.5 to 2.5. Conversely, the tensile strength of the specimen with fibers increases from 284 kPa to 357 kPa. The findings suggest that the fiber inclusion enhances the splitting tensile strength of the stabilized clay. The specimen size affects the splitting tensile strength, but the effect becomes less noticeable when the H/D ratio exceeds 2.5. From a fracture mechanism perspective, the specimen experiences mode II (shearing) due toa probable “flexural action” along its height. It remains challenging to conclude the dimensions of the test specimen or, at the very least, estimate the correction factor for the size-to-tensile strength ratio.
Unconfined Compressive Strength and Damage Evolution in Geopolymer-Stabilized Clay Shale: Role of Temperature and Alkali Activator Ratio Diana, Willis; Hartono, Edi; Muntohar, Agus Setyo; Abiyoga, Nurza Purwa
Journal of the Civil Engineering Forum Vol. 12 No. 2 (May 2026)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jcef.22477

Abstract

Exposed clay shale is highly susceptible to weathering and rapid strength degradation, which often leads to slope and earth-structure instability. Geopolymer-based soil stabilization has emerged as a promising method to improve the mechanical properties of such problematic materials. However, this chemical stabilization process is sensitive to environmental conditions, particularly temperature fluctuations. The performance of geopolymer-stabilized clay shale under elevated-temperature conditions remains insufficiently investigated, particularly in tropical regions such as Indonesia, where temperatures can fluctuate between 25◦C and 40◦C, and the exposed ground surface may reach up to 60◦C during the dry season because of intense solar radiation. This study evaluates the effectiveness of fly ash–based geopolymer in stabilizing clay shale under temperature variations ranging from 26◦C to 60◦C. A series of laboratory experiments was conducted using two alkali activator ratios (Na2SiO3:NaOH), namely 2.0 (Ratio A) and 2.5 (Ratio B). Mechanical performance was assessed through unconfined compressive strength (UCS) tests, stress–strain analysis, and energy-based damage evolution to quantify strength development and failure behavior. The results indicate that temperature is the dominant factor controlling strength development. A 10◦C increase in curing temperature resulted in a 40–60% increase in UCS, whereas variations in the alkali activator ratio produced only a 15–20% increase. The highest strength amplification, reaching 16 times that of untreated soil, was achieved using Ratio B at 60◦C, while Ratio A showed strength stagnation above 50◦C. Microstructural observations suggest that elevated temperatures accelerate geopolymer gel formation, leading to higher initial stiffness and an expanded elastic region. However, this also resulted in more brittle behavior, characterized by a higher brittleness index and rapid post-peak damage propagation for Ratio B, whereas Ratio A exhibited greater ductility. Overall, higher curing temperatures increased the dissipated energy at failure and revealed a clear strength–ductility trade-off. These findings provide insights for optimizing geopolymer stabilization of clay shale, particularly for geotechnical applications in tropical environments where elevated in situ temperatures are common.
Co-Authors Abiyoga, Nurza Purwa Afifah Anis Tsamara , Ghina Agus Setyo Muntohar Anita Widianti Apriliani, Rinda Aqilah, Nida Alimatul Ardian Dimas Prayoga Aristyasari, Yunita Furi Azam Syukur Rahmatullah, Azam Syukur Burhan Barid Dedi Wahyudi Diah Setyawati Dewanti Edi Hartono Erwin Santosa Finanda, Irsyad Mirdan Firdaus, Hafiza Fiqri Hemeto, Abd. Dzargifar Indriani, Lia Muhammad Afzalurrahman Muhammad Azhar restu faizah Salma Azizah Sumadi Sumadi Syaikul Khabir Muhyidin Virgina Dwiyas Alfaini Wahyudi, Dedi Wulandary, Kartika