Akinola Olarewaju And Abdulwaheed Oloruko-oba

This research study is determined to know the consistency behavior of black cotton soil modified with slag, with the aim of discovering a cheaper and effective replacement for soil stabilizers in civil engineering. Getting rid of nonbiodegradable waste seems to be a big challenge in the developing country like Nigeria. As a result of nonavailability of land required for disposal technique. The substitution of nonbiodegradable waste materials as a stabilizing agent in soil stabilization is a modern approach by which waste materials can be of great advantage in civil engineering projects. The black cotton soils used in this study was collected from a borrow pit on the sedimentary formation in Idogo at Yawa South Local Government, Ogun State, South-Western Nigeria. The borrow site can be located within the coordinates 8⁰ 30' 43" N and 9⁰ 48' 52" E. The slag wastes were taken from Universal Steel at Ikeja industrial layout Lagos State, Nigeria. The slag was mechanically pulverized into pieces and passed through 20um BS Test sieve after which it was substituted for black cotton soil in the percentage range of 0% to 30% at 10% intervals with 0% black cotton soil substitution serving as control experiment. In line with BS 1377 (1990) and other relevant civil engineering codes, consistency tests were conducted on the composite materials of the expansive soil mixed with varying degrees of slag, to determine the Atterberg limit test of the soil. It can be observed from the results that the percentage shrinkage limit became constant at 30% slag substitution in black cotton soil on sedimentary formation which is an indication of constancy of volume. Keywords: Black cotton Soil, Consistency, Composite materials, Stabilization, slag 0150