Application of Used Engine Oil in Soil-Cement Stabilization
A lot of studies has shown that the addition of oils to some soils at 3% and 6% contaminations by dry weight resulted in an increase in the unsoaked California bearing ratio (CBR) of the soil. This paper presents the result of investigating the applicability of used engine oil at 3% contamination as a means of reuse in the production of ordinary Portland cement (OPC) stabilized soils. The soils which are classified as clayey Gravel (GC) and clayey Sand (SC) according to the unified soil classification system were subjected to classification tests, compaction tests, soaked and unsoaked CBR tests, X-ray fluorescence and X-ray diffraction tests. The results show that there is a general reduction in the optimum moisture content of the oil contaminated soils while the effect of oil contamination on maximum dry density varied for the two types of soils under consideration. Furthermore, an increase of 130.45% and 240.37% were observed respectively in the CBR values of the oil contaminated soils after curing it for six days and soaking for 24hours in water at 8% OPC content. The procedure for curing, soaking and CBR testing were all in line with the recommendation of the Nigerian general specification for roads and bridges.