Reduced Plasticity Index Value Of Soft Clay Soil Stabilized Using A Mixture Of Calcite And Spent Catalyst Rcc 15 Rizky F.(a), Syahril S.(a*), Judiantono T.(b), Shaputra M R E (a)
a. Politeknik Negeri Bandung, Program Studi Magister Terapan Rekayasa Infrastruktur, Jurusan Teknik Sipil
b. Universitas Islam Bandung, Fakultas Teknik Sipil, Jurusan Teknik Sipil
Abstract
Good infrastructure is important for the welfare of society, but many are damaged in Indonesia due to poor subgrade soils, such as soft soils. Soft soil has a low bearing capacity and high compression so it needs to be improved to be used as a subgrade material, such as the soil taken from Cililin District, West Bandung Regency because this area has a large amount of soft soil. This research evaluates the stabilization of soft clay using a mixture of calcite and Spent Catalyst RCC 15. The samples taken were tested at the Soil Mechanics Laboratory, Bandung State Polytechnic. This research aims to reduce the amount of waste generated by PT Pertamina which can produce 20 tons of waste per day. The use of calcite can also reduce costs due to its low price because Calcite is a basic ingredient of cement. The results showed that the addition of calcite and RCC 15 improved the physical properties of the soil, especially moisture content, dry specific gravity, saturated specific gravity, and Atterberg limit. In conclusion, the addition of these admixtures significantly improved the soft clay soil characteristics, indicating the potential of using waste RCC 15 and calcite as stabilization materials. Sample Va3 with the highest addition of admixture showed significant improvement in soil properties. The soil moisture content decreased by 24.23% to 30.46%. Dry specific gravity increased by 7.93% and saturated specific gravity increased by 3.83%. The Atterberg limit showed a decrease in PI from 30.62% to 14.26%, changing the soil classification from inorganic clay (CH) to denser inorganic silt (ML).
