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All Journal Fondasi: Jurnal Teknik Sipil
Mina, Enden
Departement of Civil Engineering, Universitas Sultan Ageng Tirtayasa
Civil Engineering, Building, Construction & Architecture Transportation

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The Effect of the Addition Steel Slag and Bamboo Leaf Ash on the CBR Unsoaked Value in Subgrade Stabilization Kusuma, Rama Indera; Mina, Enden; Fathonah, Woelandari; Ramadhan, Thanara; Abdurohim, Abdurohim
Jurnal Fondasi Vol 12, No 1 (2023)
Publisher : JURUSAN TEKNIK SIPIL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/fondasi.v12i1.19598

Abstract

This research was conducted to determine the physical and mechanical properties of origin and mixed soil with added steel slag (SS) and bamboo leaf ash (BLA) and to determine soil classification based on the Unified Soil Classification System (USCS) guidelines. This study used a mixture of steel slag and bamboo leaf ash with variations (0% SS ; 0% BLA), (20% SS; 10% BLA), (40% SS; 10% BLA), (60% SS, 10 % BLA), (100% SS; 10% BLA) with a curing time of 0 and 7 days. The mechanical properties test in this study was the unsoaked CBR test. In the USCS soil type classification system at the road location, it is included in the OH group (organic clay with high plasticity) with a plasticity index value of 22.86%, a liquid limit above 50%, which is equal to 64.5% and a DCP (Dynamic Cone Penetrometer) was obtained by 3.01%. The results showed that mixing native soil with added materials increased the CBR value. The optimum soil CBR value is found in the percentage of added material, 100% steel slag, and 10% bamboo leaf ash during seven days of curing with an unsoaked CBR value of 24.95%.
Analysis of Soil Improvement using Stone Columns in Reducing Liquefaction Potential (Case study: Runway 3 of Soekarno-Hatta Airport) Mina, Enden; Kusuma, Rama Indera; Fathonah, Woelandari; Tarihoran, Rona Ulita
Jurnal Fondasi Vol 12, No 1 (2023)
Publisher : JURUSAN TEKNIK SIPIL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/fondasi.v12i1.19601

Abstract

This research discusses the use of stone columns in increasing the value of the safety factor on soils that have the potential to experience liquefaction. This study aims to determine the safety factor value of sandy soil in the study area and the safety factor value after Stone Column planning. The method used to determine the value of liquefaction potential is the method of Seed et al, based on the interpretation of SPT (Standard Penetration Test) data and using the stone column as a soil improvement method. Based on the results of the study, it is known that each point has the potential to experience liquefaction except at points BH 7, BH 8, and BH 9. The LPI value is > 15, so the research area has the potential to experience liquefaction. Before planning the safety factor value is 0.43-0.87 and after planning the stone column using an equilateral triangle pattern the safety factor value increases to 1.21-2.3 while using a square pattern of 0.95-1.94.
Co-Authors Abdurohim, Abdurohim Fathonah, Woelandari Rama Indera Kusuma Ramadhan, Thanara Tarihoran, Rona Ulita