STABILIZATION OF LATERITIC SOIL USING ASPHALTIC EMULSION AND BAGASSE ASH AS BINDER

This study is an experimental investigation that was undertaken to study the reaction a selected lateritic soil sample to stabilization with asphaltic emulsion and bagasse ash. This investigation is aimed at proffering a solution to the problem of road construction and maintenance and also building construction and maintenance with the existing and increasingly rampant situations of road failures, building failures and collapse and also failure of bridges. The undisturbed soil sample collected was mixed with 0, 4, 8, 12% asphaltic emulsion only, v then with 3, 6, 9, 12% asphaltic emulsion and 2, 4, 6, 8% bagasse ash simultaneously so as to determine the strength characteristics of the lateritic soil sample. And a series of tests were conducted on the various samples to determine their geotechnical properties and suitability in road and building constructions. From the various tests it was concluded that with the addition of the stabilization materials to the lateritic soil, there was a positive change in the geotechnical properties of the soil sample. The preliminary investigation carried out on the natural lateritic soil found in Landmark University Omu-Aran, Kwara State Nigeria shows that it falls under Group A-2-7(0) using AASHTO classification. The natural soil has a liquid limit value of 50, a plastic limit of 21.7% and a plasticity index value of 28.3%. The maximum dry density (MDD) of the soil was 1500kg/m3 and an Optimum Moisture Content (OMC) value of 23.7%. Unconfined compressive strength (UCS) values of 21.53 KN/m2 for 28-days curing periods, respectively, were recorded for the natural soil. California Bearing Ratio (CBR) value of 8.89% was recorded for the natural lateritic soil. Peak UCS and CBR values of 40.48kN/m2 and 41.9% were recorded for soil treated with 9% asphaltic emulsion 6% bagasse ash. The peak CBR value met the 20 – 30 % requirement for sub-base reported by Sadeeq J.A. et al (2015) for materials