DefinePK

Abstract

Lapindo mud containing silicate (SiO2) that can function as a filler and lime ( CaO ) as a binder between the particles. Previous research in the use of these materials, may be used as, a substitute material of cement, to mix concrete manufacture. While in this study, Lapindo mud is used as, a substitute material lime to stabilize clay soils containing salt. Soil samples were taken from the area Sumenep, then mixed with mud Lapindo 10 %, 20 %, 30 %, 40 %, 50 %. Results of this study, up to 50 % concentration slurry liquid limit value decreased 16.67 % and plasticity index, 73.73 % decline of the native land. Test compaction up with a mixture of 40 %, the solid based on the increase of the value of ?dmax, ?dmax native land at 1.42 kg / cm3 be 1:56 kg / cm3, which means an increase of 11.43 %. CBR test up to 30 % Lapindo mud mixture , 9.02 % CBR value is including the category of value CBR is good enough as a land base and an increase of 44.55 % from the original soil . Direct shear test Lapindo mud up to levels of 40 %, the value of the shear stress increased by 40.25 % of the original soil. Free press test until the Lapindo mud levels of 40%, the value of free compressive stress 2.03kg / cm2 very rigid categories and an increase of 39.04 % from the original soil. And to test free swelling up to levels of 50 % Lapindo mud, with a 24 -hour immersion, the value of development decreased by 63.64 %. So in general it can be said that the levels of Lapindo mud more than 50 % effective in stabilizing the clay in Sumenep area to reduce the potential for development, while raising the level of Lapindo mud carrying capacity is a maximum of 40 %.