Stabilization of expansive soils using silica fume and lime

Date

2023-9

Author

Güzel, Hayri

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The issue of expansive soils is a global concern that presents numerous complexities for professionals in the field of civil engineering. When exposed to water, these types of soils exhibit swelling and undergo shrinkage upon drying. The prevailing and cost-effective approach to stabilize these soils involves the utilization of admixtures that effectively mitigate volumetric alterations. This study aims to investigate the impact of incorporating silica fume and lime on mitigating the swelling potential and improving the unconfined compression characteristics. The preparation of the expansive soil has been done in the laboratory by mixing kaolinite and bentonite. The expansive soil has been modified with silica fume at different weight percentages. The determination of grain size distribution, consistency limits, compaction characteristics, swelling percentage, and unconfined compressive strength, deformation modulus of the mixtures have been conducted. The specimens have been undergoing a curing process ranging from 7 and 28 days. The experimental study revealed the impact of silica fume and lime on the swelling potential and unconfined compression characteristics of artificially prepared expansive soil specimens under laboratory conditions. The research findings show that the inclusion of silica fume and lime in the samples resulted in a threefold increase in unconfined compression strength compared to samples without additives. Additionally, the swelling potential dropped to one-fifteenth of no additive sample swelling potential, and the deformation modulus increased by a factor of five.

Subject Keywords

Expansive soil, Soil stabilization, Swelling potential, Silica fume, Lime

URI

https://hdl.handle.net/11511/105353

Collections

Graduate School of Natural and Applied Sciences, Thesis