Plasticity Index Reduction of Clay Shale Soil through Stabilization with Bledug Kuwu Mud and Asphalt Emulsion
Khansa Nuansa Oktofani (a), Syahril (a*), Indra Noer Hamdan (b)

a) Master of Applied Infrastructure Engineering Study Program, Department of Civil Engineering, Politeknik Negeri Bandung, Indonesia
b) Departement of Civil Engineering, Faculty of Civil Engineering, Institut Teknologi Nasional, Bandung, Indonesia

Abstract

Soil conditions play a crucial role in the structural integrity of buildings constructed on them. The inherent properties of clay shale can lead to structural damage or even the collapse of buildings. This study investigates the stabilization of clay shale soil using Bledug Kuwu mud and asphalt emulsion. Laboratory tests were conducted to evaluate the effectiveness of the stabilization process, including the plasticity index (PI). The soil type in this research is clay shale. Clay shale is a type of clay that readily swells when exposed to water and air. The inherent properties of clay shale can lead to structural damage or even the collapse of buildings. This research investigates the enhancement of soil parameters, especially in plasticity index, through stabilization using a mixture of Bledug Kuwu mud and asphalt emulsion. Bledug Kuwu is classified as waste due to its composition of sediment and mineral deposits from geothermal activity. The research involved clay shale soil with Bledug Kuwu mud at varying percentages (6%, 10%, 14%, and 18%), with a constant asphalt emulsion concentration of 8% across all mixtures. The objective was to determine the optimal stabilization mixture for soil. The results showed a decrease in the plasticity index and an increase in soil strength, indicating that an admixture of Bledug Kuwu mud and asphalt emulsion is an effective soil stabilization method.

Keywords: Soil Stabilization, Plasticity Index, Clay Shale, Bledug Kuwu Mud, Asphalt Emulsion

Topic: Soil sciences