Assessing the Use of Cement Kiln Dust in Sandy Soil Stabilization for Subgrade Construction
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Date
2025-04-17
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Uganda Christian University
Abstract
Sandy soils are characterized by their low bearing capacity and high permeability and are very prone to erosion. In geotechnical and construction applications, these soils present considerable challenges. Many stabilization techniques use energy-intensive substances like lime and cement, which present problems for the environment and the economy. This research investigate the feasibility of using cement kiln dust (CKD), an industrial by-product produced during the cement manufacturing process, as a
sustainable alternative for stabilizing sandy soils. Because CKD is high in calcium oxide and silica, it has potential pozzolanic properties that may improve soil cohesiveness and mechanical performance while resolving disposal-related waste management issues. This study assesses the geotechnical characteristics of CKD-stabilized sandy soils through laboratory tests, including the Proctor test, Unconfined Compressive Strength (UCS), California Bearing Ratio test, and permeability test. To find the ideal percentage for maximizing strength and durability, various percentages of cement kiln dust, ranging from 5% to 20%, were combined with sandy soil samples. After a 7-day curing period, the results showed a 45% improvement in UCS and a 58.5% improvement in CBR values, indicating that the optimum percentage of cement kiln dust to be added was 15%. Furthermore, the permeability significantly dropped by 93%, indicating improved soil. According to the MoWT general specifications for Road and Bridge Works 2005, the soil's PI, CBR swell and linear shrinkage were all determined to be within allowable limits.
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Undergraduate