Effect of Oil Contamination on Lime and Cement Stabilized Laterite Soil
Keywords:Lime, Cement, Oil-Contamination, Unconfined Compressive Strength, California Bearing Ratio
This study was carried out to evaluate the effect of spent oil contamination on the strength of lime and cement stabilized soil. Laterite soil was stabilized with lime as well as with cement in percentages of 0, 2, 4, 6, and 8 % of the dry weight of soil. Specimens were prepared for UCS and CBR. The specimens for UCS were wax cured for 7, 14 and 28 days while specimens for CBR were wax cured for 4 days. Contamination of the specimen was achieved by soaking the specimen after de-waxing top and bottom in spent oil medium in a plastic bowl for 48 hours after the respective curing periods. The uncontaminated and contaminated soils were both tested for UCS and CBR values. The results obtained show that the strength of lime and cement stabilized soil decreased when contaminated with oil. The value of the UCS decreased by about 20, 14 and 9 % and 38, 22 and 14 % respectively on the average for oil contaminated cement stabilized soil as well as oil contaminated lime stabilized soil cured for 7, 14 and 28 days respectively. Similarly, the CBR of the soil- cement and soil-lime mixtures reduced by about 13 and 35 % respectively. It was also observed that the resistance to loss in strength increased with cement and lime content with curing period. This results show that for all practical purpose, cement and lime stabilized pavement structures exposed to oil contamination are susceptible to failure as a result of reduction in strength and bearing capacity due to oil contamination.
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