Stabilization Of Expansive Soil Used As Subgrade Material Using Cement Kiln Dust

Expansive soils are worldwide problems that pose several challenges to civil engineers. Suchrnsoils swell when given access to water and shrink when they dry out. The most common andrneconomical method for stabilizing these soils is using admixtures that reduce volumernchanges. This research work is aimed at evaluating the suitability of cement kiln dust forrnstabilization of expansive clay soils. The preliminary investigated expansive soil shows that itrnbelongs to A-7-5 class of soil according to the AASHTO soil classification system. Soilsrnunder this class are generally of poor engineering benefit. The soil was stabilized withrncement kiln dust with the proportions of 5%, 10%, 15%, 20%, 25% and 30% by dry weight ofrnthe soil. Atterberg limits, free swell, swell –pressure, compaction, UCS, linear shrinkage rnand CBR tests were conducted to evaluate the properties of the stabilized soil. All stabilizedrnsoil samples were cured for 7 days for Atterberg limit and compaction tests. For CBR test,rnthe samples were cured for 7, 14 and 28 days. For UCS test, however curing was done for 7rnand 14 days.rnAnalysis of the results shows that slight improvement was achieved on the geotechnicalrnproperties of the cement kiln dust stabilized soil. Cement kiln dust reduces the plasticityrnindex, swelling and MDD with increase in OMC and CBR with all higher cement kiln dustrncontents. Curing has significant effect on the geotechnical properties of cement kiln dustrnstabilized soil.

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