INVESTIGATING THE EFFECT OF CEMENT KILN DUST QUARRY DUST ON THE STABILIZATION OF LATERITE SOILS
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Date
2025-12-11
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Uganda Christian University
Abstract
The research carried out according to this text was aimed at improving the properties poor grade laterite soils using Cement kiln dust and Quarry dust so as to match up to the required physical and mechanical properties of a G45 material for the subbase layer of a road. Lateritic soils are a leached residue formed by the natural process of laterization in tropical and subtropical regions around the world and are often used as materials for roads. The Cement kiln dust used was a waste product of the process of manufacture of cement and the quarry dust was derived from crushed granite stone. The laterite soils sampled in this research carried out were retrieved from Ntawo Borrow pit and were characterized by a very low California Bearing Ration (CBR), high plasticity index and high CBR swell. This report highlights the methodology followed to improve the quality of the soils to meet the required standards for a G45 material according to the MoWT general specifications for roads and bridge works. The different tests carried out provided satisfactory results in the blend where 15% cement kiln dust was used with 15 % quarry dust in which the California Bearing Ration was increased from 27% to 57%, the Plasticity index was reduced from 20.0% to 8.9%, and the CBR swell was reduced from 0.54% to 0.35%. These were all up to standards for a subbase material hence Cement kiln dust and quarry dust can indeed be efficiently used for stabilization of laterite soils. This is therefore an important research that incorporates industrial waste materials into construction of roads which promotes sustainability while also enhancing the strength of soil.
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Under graduate research