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Stabilization of Expansive Soil by Improving the Engineering Properties Using Lime and Fly Ash

Soil stabilization stands as a vital process aimed at enhancing the structural qualities of expansive soil to bolster its stability. This involves meticulous compaction control, appropriate mixture ratios, and the introduction of suitable additives and stabilizing agents. Numerous infrastructure endeavors, including roads, railways, water reservoirs, and land reclamation ventures, demand substantial volumes of earth materials. However, regions featuring expansive soil, unfit for construction purposes, necessitate stabilization interventions. Utilizing local resources like sand, silt, lime, and fly ash can effectively stabilize such soil. The current research study centers on investigating the effectiveness of lime and fly ash as additives or stabilizers to heighten the engineering attributes of expansive soil. The research project systematically assesses the impact of lime and fly ash on crucial soil engineering properties, encompassing liquid limit, plastic limit, compaction characteristics, and the California Bearing Ratio (CBR). The experimentation involves varying proportions of lime (ranging from 3% to 12%) and fly ash (ranging from 10% to 40%) within the expansive soil. Outcomes indicate that the introduction of lime elevates the liquid limit, Maximum Dry Density (MDD), and CBR, while diminishing the plastic limit, and Optimum Moisture Content (OMC) of the soil. On the other hand, the inclusion of fly ash reduces the liquid limit, plastic limit, and OMC of expansive soil, concurrently increasing the MDD and CBR values. The primary aim of this research endeavor revolves around determining the viability of lime and fly ash as modifiers or stabilizers for expansive soil in the context of road construction. The study strives to pinpoint the optimal quantities of lime and fly ash that yield optimal performance, particularly in terms of CBR, when the soil functions as a subgrade in highway projects. The findings affirm that the amalgamation of lime and fly ash effectively stabilizes expansive subgrade soils, presenting an economically efficient solution. The results underscore that the incorporation of lime and fly ash augments the geotechnical qualities of expansive soil, rendering it a feasible choice for roadwork and other construction undertakings.

Soil Stabilization, Expansive Soil, Fly Ash, Lime Stabilization, Sustainability, Waste Materials, Clay Soil

Naimul Haque Nayem. (2023). Stabilization of Expansive Soil by Improving the Engineering Properties Using Lime and Fly Ash. International Journal of Engineering Management, 7(2), 27-34.

Copyright © 2023 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License ( which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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