Increasing soaked CBR stability value of mixed soft clay with sodium chloride (NaCl) and rice husk ash (RHA)

Simanjuntak, Dina and Simanjuntak, Risma Masniari and Hutabarat, Lolom Evalita (2023) Increasing soaked CBR stability value of mixed soft clay with sodium chloride (NaCl) and rice husk ash (RHA). AIP Confence Proceedings, 2689 (1). 040007-1-040007-9.

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Abstract

Abstract. The soil type that often is an obstacle in its construction is soft clay with a low bearing capacity. Generally, soft clay also has non-uniform expansion and shrinkage properties. Therefore, it is necessary to improve the stabilization of soft clay to meet the technical requirements to be used as a subgrade. Soil stabilization is usually done by applying chemicals to the soil, which will increase its bearing capacity. In this study, addition of sodium chloride (NaCl) salt and rice husk ash was used. The bearing capacity characteristics of the soil after being stabilized were checked using the CBR immersion test. In the first stage, rice husk ash powder passes filter No. 200, and the sodium chloride (NaCl) salt is dissolved. Rice husk ash was mixed with 0%, 8%, 10%, 12%, 14%, and 16%, respectively, while 15% NaCl was used in a dry soil mixture, then tested the CBR value by immersion. The results showed that the CBR value of the original soil increased from 2.84% to 7.57% after being mixed with 15% NaCl salt. In addition, the use of rice husk ash varied with 15% NaCl salt also significantly increased soil stabilization. The results of the CBR value in the overall rice husk ash mixture increased from 2.84% to 4.73%; 2.84% to 7.76%; 2.84% to 12.78%; 2.84% to 11.36%; and 2.84% to 7.1% for soils with husk ash 8%, 10%, 12%, 14% and 16% respectively without being mixed with 15% NaCl salt. In comparison, the resulting CBR value increased from 2.84% to 5.87%; 2.84% to 8.05%; 2.84% to 9.47%; 2.84% to 8.33%; and 2.84% to 6.15% for soils with 8%, 10%, 12%, 14%, 16% husk ash mixed with 15% NaCl salt, respectively. The largest increase was obtained in 12% rice husk ash, namely the CBR value of 12.78% without 15% NaCl and 9.47% CBR value with 15% NaCl.

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