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Geotechnical and Geological Engineering

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09-11-2017 | Original paper

Influence of Drying on the Stiffness and Strength of Cement-Stabilized Soils

Authors: Alain Le Kouby, Antoine Guimond-Barrett, Philippe Reiffsteck, Anne Pantet

Published in: Geotechnical and Geological Engineering | Issue 3/2018

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Abstract

Nowadays, improving the strength and deformation properties of soft soils by deep soil mixing is a commonly used technique. There is also an increasing interest in the use of this technique for foundation/structural elements and excavation retaining walls applications. The compressive strength and elastic modulus of the soil mix material are key parameters in the design of these structures. However, there is very limited information available on the impact of exposure to air drying (in the case of retaining wall) on the strength and stiffness of cement stabilized soils. The aim of this study is to investigate the effects of different curing conditions (immersion in water, cycles of wetting and drying, continuous air drying) on the mechanical properties of soils treated with cement in the laboratory. Free–free resonance tests and unconfined compression tests were performed on specimens of silt and sand treated with blastfurnace slag cement. Strength increases more rapidly than stiffness between 7 and 30 days. The strength of stabilized soils submitted to cyclic wetting and drying before the cement hydration process is complete continues to increase. As long as the periods of drying do not induce microcracks, the stiffness of the treated soil specimens also increases with time. However, the stiffness is lower than for the specimens cured in water indicating a disruptive effect of the imposed wetting–drying cycles on stiffness. Continuous exposure to air drying inhibits strength development due to insufficient water for hydration. Significant stiffness decreases were observed on specimens of stabilized silt and are attributed to microcracking.

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Title: Influence of Drying on the Stiffness and Strength of Cement-Stabilized Soils
Authors: Alain Le Kouby
Antoine Guimond-Barrett
Philippe Reiffsteck
Anne Pantet
Publication date: 09-11-2017
Publisher: Springer International Publishing
Published in: Geotechnical and Geological Engineering / Issue 3/2018
Print ISSN: 0960-3182
Electronic ISSN: 1573-1529
DOI: https://doi.org/10.1007/s10706-017-0401-y

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