Pengaruh Penambahan Abu Bonggol Jagung Sebagai Bahan Stabilisasi Tanah Lempung dengan Pengujian Califonia Bearing Ratio (CBR) dan Uji Kuat Tekan Bebas

Abstract

One of the most important elements of structure is the soil. Clay soil has a low bearing capacity and large settlement when it is given a load. Therefore, a soil improvement effort is needed such as soil stabilization (Daly, 2010). In this study, soil stabilization was carried out chemically, by adding corn cob ash. The aim of this study was to determine the effect of corn cob ash addition as a stabilization material for clay soil in terms of the CBR laboratory value and unconfined compressive strength value. In this study, the soil was mixed with corn cob ash in varying percentages of 2%, 4%, 6%, 8%, 10%, 12%, 14%, 16%, 18%, 20%, 22% and 24% with 3 days of curing time. From the study results, it was determined that the clay soil sample has a moisture content value of 63,87%, spesific gravity of 2,658, liquid limit of 49,98%, plastic limit of 12,02% and plasticity index of 36,96%. Based on the USCS classification, the clay soil is classified as CL (Clay-Low Plasticity) and based on the AASHTO classification it is classified as A-7-6. The unsoaked laboratory CBR value of clay soil is 3,81% and the unconfined compressive strength value of clay soil is 0,831 kg/cm2. The optimum value of all variations was reached at 8% corncob ash variation, with laboratory CBR value of 6,14% and unconfined compressive strength value of 1,168 kg/cm2.