PENGARUH LIMBAH CANGKANG TELUR TERHADAP KEPADATAN DAN DAYA DUKUNG TANAH LEMPUNG TALANG SALI SELUMA

Abstract

This study was conducted to identify the effect of eggshell residue utilization on the compaction value and load-bearing capacity of clay soil. The soil material used came from the Talang Sali area, East Seluma District, Seluma Regency, where the soil has a high level of adhesiveness, weak bearing capacity, and characteristics of volume changes in the form of significant expansion and shrinkage, making it unsuitable as a construction base. The research technique used was a laboratory experiment by adding eggshell powder mixtures with compositions of 0%, 6%, 12%, and 18% of the total dry soil mass. Based on the test results, the use of eggshell powder waste was proven to be able to change the characteristics of clay soil both in terms of its basic properties and strength. The dry unit weight value of the soil showed a tendency to increase with increasing mixture content until it reached its most effective point, while the level of soil flexibility decreased. Furthermore, the CBR value used as a reference in assessing the soil's ability to withstand pressure showed higher results compared to the initial condition of the soil without treatment, thus indicating an improvement in the quality of the subgrade. However, using too much mixture can actually reduce the success of the soil improvement process.