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Article Dans Une Revue Construction and Building Materials Année : 2023

Experimental study on the freezing-thawing behavior of compacted earth

Résumé

Most of compacted earthen constructions are located at temporary and seasonal frozen areas, consequently exposed to repeated freezing-thawing (F-T) environment induced by significant temperature fluctuations. The F-T cycles can cause severe damage to the compacted earthen materials and reduce the structure’s durability. In this paper, a series F-T tests were performed in order to study the damage mechanism of the compacted earthen materials subjected to F-T cycles. The experiments were carried out under two confining pressures ( 0 kPa and 50 kPa) and three freezing temperatures ( −5℃, −8℃ and −13℃), with a thawing temperature of 9℃. Evolution of elastic moduli and accumulation of irreversible strain at the end of each F-T processes were analyzed through cyclic loading–unloading tests under undrained condition. Results indicate that each F-T cycle could be characterized by main six stages, whose physical meaning has been explained through a thermodynamic approach. With increasing number of F-T cycles, a growth of the Young’s modulus was observed when the material was in a frozen state, and the opposite was found for the thawed state. This may be explained by an increase in macro-porosity as F-T cycles progress, which would be in line with the accumulation of residual deformation and the increase of freezing and thawing temperatures. The applied confining pressure was eventually found to provide a positive resistance against permanent deformation. This discovery can provide experimental support to the safety design of earthen wall situated in cold regions.
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Dates et versions

hal-04236874 , version 1 (11-10-2023)

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Youneng Liu, Antonin Fabbri, Henry K.K. Wong, Lassana Bakary Traore, Xin Li, et al.. Experimental study on the freezing-thawing behavior of compacted earth. Construction and Building Materials, 2023, 404, pp.133130. ⟨10.1016/j.conbuildmat.2023.133130⟩. ⟨hal-04236874⟩
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