INCREASING THE STABILITY OF EXPANSIVE SOIL USING LAPINDO SEDIMENTS MATERIALS

Abstract

Expansive soils contain water-absorbing clay minerals, including smectite and montmorillonite. So expansive soil undergoes a process of expanding and shrinking. Changes in expanding and contracting can weaken structures built on expansive soils. One effort to overcome the problem of expansive soils is a chemical stabilization process using lapindo deposits. The purpose of this study was to determine the effect of stabilizing expansive soils using lapindo sediment materials. Using physical and mechanical testing before and after the expansive soil stabilization process. Using a mixture of 0%, 5%, 10%, 15% & 20% between expansive soil and stabilizing agent. The results showed that the plasticity index decreased from 37.8% to 15.3%, and the compressive strength increased from 0.30 kg/cm2 to 0.90 kg/cm2 with the addition of 20% sediment material lapindo. The physical and mechanical properties of expansive soils can be increased by stabilizing them with lapindo sediments. These modifications can reduce the soil's expanding potential, increase its weight, and give it clay-like qualities.