Stabilization of Expansive Soil Used as Subgrade Material Using Cement Kiln Dust
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Date
2017-09
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Addis Ababa University
Abstract
Expansive soils are worldwide problems that pose several challenges to civil engineers. Such
soils swell when given access to water and shrink when they dry out. The most common and
economical method for stabilizing these soils is using admixtures that reduce volume
changes. This research work is aimed at evaluating the suitability of cement kiln dust for
stabilization of expansive clay soils. The preliminary investigated expansive soil shows that it
belongs to A-7-5 class of soil according to the AASHTO soil classification system. Soils
under this class are generally of poor engineering benefit. The soil was stabilized with
cement kiln dust with the proportions of 5%, 10%, 15%, 20%, 25% and 30% by dry weight of
the soil. Atterberg limits, free swell, swell –pressure, compaction, UCS, linear shrinkage
and CBR tests were conducted to evaluate the properties of the stabilized soil. All stabilized
soil samples were cured for 7 days for Atterberg limit and compaction tests. For CBR test,
the samples were cured for 7, 14 and 28 days. For UCS test, however curing was done for 7
and 14 days.
Analysis of the results shows that slight improvement was achieved on the geotechnical
properties of the cement kiln dust stabilized soil. Cement kiln dust reduces the plasticity
index, swelling and MDD with increase in OMC and CBR with all higher cement kiln dust
contents. Curing has significant effect on the geotechnical properties of cement kiln dust
stabilized soil.
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Keywords
Expansive Soil, Cement Kiln Dust, Stabilization, Subgrade Material