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Hydraulic performance and microstructure evolution of kneading compacted lime-treated silty soil permeated with low-ionic strength solution.

Abstract : Durability of lime-treated earthen structures is governed by the hydromechanical performances of the soil. However, fewer studies address the influence of pore solution's chemistry on the mechanism governing the hydraulic and microstructural evolution of the materials. The hydraulic and leaching performances of lime-treated soil, compacted by kneading, and subjected to circulations of demineralized water (DW) or a low ionic strength solution (LW) are studied. The evaluation is made in terms of pore volume flow (PVF), as it considers the soil and pore fluid interactions which govern the leaching mechanism. During the hydraulic conductivity test, 40 PVF of DW is circulated through the specimens within a duration, which is 20 times lower than the one obtained from the LW-subjected soil. Such an accelerated circulation dissolute minerals contained along the flow path in the soil matrix in a short time. This mechanism increases the volume of macropores greater than 500 Å diameter. Increased macropores, thus, increased the magnitude of the hydraulic conductivity in DW-subjected soil. Besides, due to a longer contact duration between the treated soil and the LW than in DW, a greater formation of the cementitious compounds occurred in the former compared to the latter.
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https://hal.archives-ouvertes.fr/hal-03629297
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Submitted on : Monday, April 4, 2022 - 11:38:32 AM
Last modification on : Monday, June 20, 2022 - 3:13:43 PM

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  • HAL Id : hal-03629297, version 1

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Geetanjali Das, Andry Razakamanantsoa, Dimitri Deneele, Gontran Herrier. Hydraulic performance and microstructure evolution of kneading compacted lime-treated silty soil permeated with low-ionic strength solution.. 20th International Conference on Soil Mechanics and Geotechnical Engineering 2022, May 2022, SYDNEY, Australia. 6 p. ⟨hal-03629297⟩

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