Shear Strength Behaviour of Sedimentary Soil Stabilized by Fly Ash

Abstract Sedimentary soil is made up of deposits that are the consequence weathering rocks have already been deposited elsewhere by various natural processes, including water, wind, and others. A location with sedimentary Bili-bili Dam in South Sulawesi Province's Gowa Regency. at this quite abundant has not used general, so it can be investigated for its use, namely stability against influence external forces on carrying capacity soil. Stabilizing one approach to boost bearing capacity, particularly The original categorized as group A-4, or silty soil, according AASHTO classification system ML, silt low plasticity, USCS system, based findings physical characteristics testing. It demonstrated soil's cohesiveness shear angle increase addition fly ash. adding ash stabilizing material allowing cure increased cohesion value from initial 0.72 kg/cm2 1.70 after 28 days. With a 20% mixture curing period days, 22 31; 40% value.