PENGARUH CAMPURAN ABU SEKAM PADI DAN SEMEN PCC TERHADAP NILAI CBR TANAH PLASTISITAS TINGGI

Abstract

Soil is a collection of natural mineral granules (Ageregat) which can be separated by a mechanical means if the ageregat is stirred in water or a collection of minerals, organic matter and loose deposits, which are located above the bedrock. Rocks are the ones whose minerals are bound together by cohesive forces that are permanent and strong, and cannot be separated by simple mechanical means. The ground is the basis of a structure or construction, both building construction and road construction. For this reason, there is a need for soil improvement in order to increase the carrying capacity of the soil, one of which is by chemically improving the soil. This study was emphasized to analyze soil characteristics using the stabilization method using Rice Husk Ash and PCC Cement according to the variation of each stabilization material to the CBR Value parameter. In addition to determining the physical characteristics of the soil that has not been stabilized, this research is also focused on knowing the level of the stabilized material that provides optimum carrying capacity on the soil. The percentage of stabilization materials used in this study were Rice Husk Ash and Portland Composite Cement: 20% PCC + 0% ASP, 16% PCC + 4% ASP, 12% PCC + 8% ASP, 8% PCC + 12% ASP, 4% PCC + 16% ASP and 0% PCC + 20% ASP. The soil is mixed with stabilization materials according to the percentage of the ingredients evenly. CBR testing results for soil stabilization with Rice Husk Ash and Portland Composite Cement Cement, reached the maximum CBR Unsoaked value at the addition of 16% PCC + 4% ASP to 0.1 "by 33.40%, to 0.2" by 31.50% Sedangkang for CBR Soaked reaching maximum value on the addition of 16% PCC + 4% ASP to 0.1 "of 20.20%, to 0.2" of 19.95%. Of course it meets the required specifications of the road subgrade strength (requirements for CBR values> 6%).