Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
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Weathering of a lime-treated clayey soil by drying and wetting cycles
Abstract Lime treatment induces several time-dependent physico-chemical processes (cation exchange, pozzolanic reactions, etc.) that result in the bonding of soil particles. This treatment can reduce the swelling properties of clays and improve their strength. Nevertheless, these positive effects of lime-treatment could be altered by weathering in the very long term. In this paper, the effects of successive drying/wetting cycles on the hydro-mechanical properties of a lime-treated clayey soil are considered. Quicklime-treated samples were subjected to successive controlled-suction (osmotic technique) drying/wetting cycles; and also severe hydric cycles corresponding to an alternation of oven drying and saturation. The effect of quicklime dosage and curing time were considered. The results show a progressive increase of the swelling properties of the material and a progressive loss of strength with increasing number of drying/wetting cycles. The extent of the degradation is directly related to the amount of added quicklime and the amplitude of the suction cycles. Mercury intrusion porosimetry tests show that successive cycles lead to a progressive change of the micro-fabric, thus explaining partly the degradation of macroscopic properties. This study shows that weathering by successive drying/wetting cycles is likely to significantly alter the properties of a lime-treated soil, thus weathering effects should be accounted for the long term design of treated soil structure.
Graphical abstract Display Omitted
Highlights Stress sensitivity is used to quantify structure effects of cementitious bonds. Hydric cycles extent and lime content are determinant for the treated-soil weathering. Hydric cycles decrease the mechanical performance of the lime-treated swelling soil. Microstructural change partly explains degradation of the lime-treated swelling soil.
Weathering of a lime-treated clayey soil by drying and wetting cycles
Abstract Lime treatment induces several time-dependent physico-chemical processes (cation exchange, pozzolanic reactions, etc.) that result in the bonding of soil particles. This treatment can reduce the swelling properties of clays and improve their strength. Nevertheless, these positive effects of lime-treatment could be altered by weathering in the very long term. In this paper, the effects of successive drying/wetting cycles on the hydro-mechanical properties of a lime-treated clayey soil are considered. Quicklime-treated samples were subjected to successive controlled-suction (osmotic technique) drying/wetting cycles; and also severe hydric cycles corresponding to an alternation of oven drying and saturation. The effect of quicklime dosage and curing time were considered. The results show a progressive increase of the swelling properties of the material and a progressive loss of strength with increasing number of drying/wetting cycles. The extent of the degradation is directly related to the amount of added quicklime and the amplitude of the suction cycles. Mercury intrusion porosimetry tests show that successive cycles lead to a progressive change of the micro-fabric, thus explaining partly the degradation of macroscopic properties. This study shows that weathering by successive drying/wetting cycles is likely to significantly alter the properties of a lime-treated soil, thus weathering effects should be accounted for the long term design of treated soil structure.
Graphical abstract Display Omitted
Highlights Stress sensitivity is used to quantify structure effects of cementitious bonds. Hydric cycles extent and lime content are determinant for the treated-soil weathering. Hydric cycles decrease the mechanical performance of the lime-treated swelling soil. Microstructural change partly explains degradation of the lime-treated swelling soil.
Weathering of a lime-treated clayey soil by drying and wetting cycles
Stoltz, Guillaume (Autor:in) / Cuisinier, Olivier (Autor:in) / Masrouri, Farimah (Autor:in)
Engineering Geology ; 181 ; 281-289
15.08.2014
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Weathering of a lime-treated clayey soil by drying and wetting cycles
| Online Contents | 2014
Weathering of a lime-treated clayey soil by drying and wetting cycles
| British Library Online Contents | 2014
Long Term Behavior of Lime-Treated Clayey Soil Exposed to Successive Drying and Wetting
| British Library Conference Proceedings | 2014