Stabilization of lateritic soils with asphalt- emulsion
Over the years, soil improvement techniques by chemical additives have provided challenges to highway technology. In this respect, an experimental investigation was undertaken to study the response of three selected lateritic soil samples to stabilization with asphalt-emulsion. The investigation was aimed at providing more solutions to the problems of highway construction and maintenance with the current widespread highway pavement failures in Nigeria. Test results show that lateritic soils respond favourably with the addition of asphalt-emulsion, but materials containing excessive amounts of clay are not found suitable for stabilizing with asphalt-emulsion due to difficulty in mixing and a prolonged curing period needed to obtain desired strength. The best soil-asphalt emulsion mix for the tested soil samples was between 6 and 8% depending on the plasticity of the soil.
Keywords: Lateritic soils, Asphalt Emulsion, Stabilization, California Bearing Ratio (CBR), Unconfined Compressive Strength (UCS), Optimum Moisture Content (OMC), Maximum Dry Density (MDD)