4.1 Article

New Approach for Characterization and Mitigation of the Swelling Phenomenon

期刊

FRONTIERS IN BUILT ENVIRONMENT
卷 8, 期 -, 页码 -

出版社

FRONTIERS MEDIA SA
DOI: 10.3389/fbuil.2022.836277

关键词

expansive clay; characterization; granular material; swelling pressure; mitigation; oedometer test; compression index; swelling index

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This article introduces a new method for characterizing expansive clays after oedometer tests, and validates a novel approach for mitigating the swelling phenomena. The mitigation solution involves placing a compacted granular layer as an interface between the expansive clay and the foundation, reducing the swelling effect significantly.
This article first introduces a new method of characterization of expansive clays after oedometer test results performed on intact saturated clay specimens. On the presumed expansive clays specimens, oedometer tests are preceded by the free swelling test from which the swelling pressure is measured. From current oedometer test results carried out on expansive and non-expansive clays, the ratio of compression index (C-c) by the swelling index (C-s) was determined. A threshold value of the ratio C-c/C-s was identified to distinguish between expansive clay specimens and non-expansive clay specimens. Second, a novel mitigation method of the swelling phenomena was validated by performing oedometer tests on expansive clay specimens preceding the measurement of swelling pressure. Oedometer tests performed on a 53% thickness clay specimen overlaid by a 47% thickness of sand showed a significant reduction of the swelling pressure compared to that measured on a full expansive clay specimen. The mitigation solution reduced the swelling effect by placing a compacted granular layer as an interface between the expansive clay and the foundation. This solution has been adopted and approved in forthcoming a lightweight building construction at the Faculty of Sciences of Tunis City.

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