Influence of Delay after Mixing on Compaction Characteristics of Cement- Locust Bean Waste Ash Modified Lateritic Soil
Abstract
weight of soil was evaluated for use in road construction. Lateritic soil – OPC - LBWA mixtures were delayed for up to 3 hours after
mixing before compaction at British Standard light (BSL) energy, thus simulating the likely delay in the placement of the mixtures that
might occur in the field. Results obtained show that maximum dry density (MDD) values of the natural soil increased from 1.62 to
1.79Mg/m3 at 3 hours delay after mixing when treated with 4% OPC/6% LBWA, while the optimum moisture content (OMC) values
decreased from 16.2 to a minimum of 11.33% after 3 hours when the soil was treated with 2% OPC/4% LBWA blend. Statistical
analysis was carried out on results obtained using analysis of variance (ANOVA) with the Microsoft Excel Analysis Tool Pak Software
Package to determine the levels of significance of effect of cement/ and LBWA on the properties of the soil. The effects of cement and
LBWA from the results obtained were not statistically significant on the compaction characteristics. Based on the results obtained from
the study, it is recommended that an optimal mix of 2% OPC/6% LBWA be used for the modification of lateritic soil and should not be
placed more than 2 hours after mixing for the construction of sub-base and base of lightly trafficked roads.
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