Effects of subgrade stabilized with calcite and asphalt emulsion

Abstract

Improvement of the soft soil as a subgrade has done a lot and one of them is soil stabilization. This soil stabilization is to change the physical and mechanical properties of a soft soil by mixing certain materials. The type of the soil is expansive clay. In this experiment, the stabilization materials that chosen are calcite and asphalt emulsion. The variation of the soft soil mixture that will be stabilized is using calcite of 6%, 9%, 12%, 15%, 18%, and asphalt emulsion of 8% as a fixed variable. The results of plasticity index of the stabilization soil decreased by 81%. The water content obtained from soil stabilization also decreases with values between 22% to 30%. Then, CBR testing was done with the variation time of 0, 3, 7, 14 days for unsoaked condition and 4 days for soaked condition. The CBR value of the stabilization increased 120% for unsoaked and 211% for soaked. Based on the results of this experiments, a mixture of calcite and asphalt emulsion can be used for an expansive clay soil as a subgrade of a pavement structures.