STABILIZING PEAT SOILS BY USING MARBLE ASH AND POLYESTER RESIN SOLUTION

Abstract This research aims to measure the bearing capacity of peat soil through the stabilization of polyester resin and marble ash.The highway alignment that is made sometimes has to pass through peatland areas, so it is necessary to stabilize the soil so that its carrying capacity meets the requirements. Peat soil is known as soil with very high pore numbers and water content so that the soil's carrying capacity is low (California Bearing Ratio (CBR) < 6%). In this research, peat soil was taken at a depth of ± 1 m in Tanoh Manyang village, Teunom subdistrict, Aceh Jaya district.The stabilizer used is marble ash which comes from marble/limestone cutting waste in the South Aceh Polytechnic Industrial laboratory and a polyester resin solution purchased from a building materials shop as a binder.The tests carried out were on the physical and mechanical properties of peat soil after being mixed with soil stabilization materials based on Indonesian national standards (SNI).The results of the compaction test, the wopt value decreased from the original soil wopt value of 68.0% to 13.0% at a mixture percentage of 30% and the maximum dry bulk density (ɣd) decreased from the original soil ɣd value of 0.68% to 0.66% at a mixture percentage of 5 %.Then increase the mixture percentage from 10% to 30% from the original soil ɣd 0.68% to 1.18%.The research results showed that there was an increase in the CBR value due to the addition of stabilization materials.The CBR value of the original soil without soaking was 1.50% to 4.50% at a mixture percentage of 30% and the CBR value of the original soil soaking was 1.4% to 5.4% at a mixture percentage of 30%. However, the use of marble ash at a percentage of 30% and a 10% polyester resin solution has not been able to improve the CBR. It is recommended to add a percentage of marble ash greater than 30%, so that a CBR of > 6% is obtained.