Stabilization of an expansive clay by using zeolite and lime

Date

2023-09-16

Author

Çokça, Erdal
Demirbaş, Güneş

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Expansive clays are a worldwide problem that poses several challenges for civil engineers. Such clayss swell when given an access to water and shrink when they dry out. Expansive clays can be stabilized by using admixtures. In this study the effect of using zeolite and lime in reducing the swelling potential of an expansive clay is examined. According to the ASTM C-618 standard zeolite is considered as a pozzolanic material. Grain size distribution, Atterberg limits and swell percent of the zeolite-lime- expansive clay mixtures are determined. Specimens are cured for 7 and 28 days. As a result of the experimental study, it was seen that addition of zeolite and lime mixture decreased swelling potential of the artificially prepared expansive clay specimen. The swell percentage of the stabilized specimens are affected positively by curing. The decrease in swell potential is due to zeolite - lime - expansive clay reactions, In the first phase, Ca2+ cations of the lime replace the sodium (Na+) ions of expansive clay, this reaction reduces the thickness of the diffuse double layer which will cause flocculation and reduction in the plasticity of the soil. Hydration of lime with water liberates (OH)- ions which will cause increment in the pH of the soil solution, this will lead to increment in the solubility potential of silica and alumina and leads to a pozzolanic reaction and in the second phase, the cementing compound (CSH and CAH) gradually bonds the clay particles together. Curing positively affects the pozzolanic reactions.

URI

https://hdl.handle.net/11511/105739

Collections

Department of Civil Engineering, Conference / Seminar