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Effects of aggregate size on water retention capacity and microstructure of lime-treated silty soil

Abstract : Lime treatment is a common technique of improving the workability and geotechnical properties of soils. In this study, the aggregate size effects on the water retention capacity and microstructure of lime-treated soil were investigated. Two soil powders with different maximum aggregate sizes (D max = 0·4 and 5 mm) were prepared and stabilised by 2% lime (by weight of dry soil). Soil samples were prepared by compaction at dry side of optimum water content (w = 17%) with a dry density of 1·65 Mg/m 3. Suction and pore size distribution were determined after different curing periods. The results obtained show that: (a) the treated soil with smaller D max presents relatively smaller modal sizes and lower frequency of macropores (10–330 μm); (b) lime addition effectively improves the soil water retention capacity and decreases both the modal sizes of macro-and micropores gradually over time. Moreover, a higher air entry value and larger water retention capacity were also observed for a smaller D max value, in agreement with the pore size distributions.
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Submitted on : Tuesday, February 9, 2016 - 9:22:30 AM
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Yejiao Wang, Yu-Jun Cui, Anh Minh Tang, Chaosheng Tang, Nadia Benahmed. Effects of aggregate size on water retention capacity and microstructure of lime-treated silty soil. Géotechnique Letters, ICE Publishing, 2015, 5 (4), pp.269-274. ⟨10.1680/jgele.15.00127⟩. ⟨hal-01271314⟩

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