Abstract
An expansive soil (black cotton soil) treated with up to 10 % cement kiln dust (CKD), a waste obtained from the manufacture of cement, was evaluated for use as a flexible pavement construction material. Laboratory tests were carried out on specimens compacted with British Standard light, British Standard light or standard Proctor (relative compaction = 100 %) energy. Results obtained show that the index properties of the soil improved with CKD treatment. Peak unconfined compressive strength of 357.07 kN/m2 and California bearing ratio (CBR) of 7 % as well as resistance to loss in strength of 44 % were recorded at 10 % CKD treatment. Reduction in the particle sizes with curing period was observed when samples were viewed through the scanning electron microscope. The study showed that CKD can be beneficially used to improve the subgrade of lightly trafficked roads and as admixture in lime stabilization during construction of flexible pavements over expansive soil.
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Salahudeen, A.B., Eberemu, A.O. & Osinubi, K.J. Assessment of Cement Kiln Dust-Treated Expansive Soil for the Construction of Flexible Pavements. Geotech Geol Eng 32, 923–931 (2014). https://doi.org/10.1007/s10706-014-9769-0
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DOI: https://doi.org/10.1007/s10706-014-9769-0