SUBGRADE REPAIR ON THE ROAD PAVEMENT IN TANJUNG REJO VILLAGE USING PALM KERNEL SHELL ASH AS REVIEWED FROM UNDRAINED CONSOLIDATED TRIAXIAL TESTS An Experimental Study Based on Undrained Consolidated Triaxial Tests Section Articles

Abstract

Clay soil is a fine-grained soil with low bearing capacity and is highly sensitive to
changes in water content, making it susceptible to volume changes and swelling
shrinkage behaviour. This condition is unfavourable when clay is used as the subgrade
for building structures or roadways. Therefore, one method to address this problem is
to improve the clay subgrade by stabilizing it with palm kernel shell ash. In this study,
soil clay from Tanjung Rejo Village was stabilized and tested using both physical and
mechanical tests, including Atterberg Limits, specific gravity, moisture content, sieve
analysis, compaction, and Consolidated Undrained (CU) triaxial tests. Palm shell ash
was added in variations of 0%, 5%, 10%, 15%, and 20%. The findings of this study
show improvements in the physical properties of clays and an increase in their CU
shear strength. The addition of palm kernel shell ash also increased the cohesion (C)
and the soil's friction angle (φ).
Keywords: Palm Kernel Shell Ash, clay, soil stabilization, triaxial, unconsolidated
undrained