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Article Dans Une Revue Cement and Concrete Research Année : 2014

Macrocrack propagation in a concrete specimen under sustained loading: study of the physical mechanisms

Résumé

This study presents a series of 4-point bending tests performed to describe the delayed behavior of unreinforced pre-cracked beams under low, moderate and high sustained loading levels. The deflection creep rate, the failure time and the load level were assessed. A linear relation, in a semi-log scale, was found for the deflection creep rate at high load levels. In addition, a linear relation, in a log-log scale, between the secondary deflection creep rate and failure time was observed. Besides, it was shown that the secondary creep deflection rate increases with the sustained loading level and the macrocrack propagation rate when macrocrack propagation occurs during the sustained loading. Physical mechanisms are proposed to explain these results and may be summarized as follows: the delayed behavior of an unreinforced cracked concrete specimen under sustained loading is mainly due to the cracking evolution, thus the creation of microcracks and/or the propagation of a macrocrack.
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Dates et versions

hal-01205526 , version 1 (25-09-2015)

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Pierre Rossi, Claude Boulay, Jean-Louis Tailhan, Eric Martin, Dominic Desnoyers. Macrocrack propagation in a concrete specimen under sustained loading: study of the physical mechanisms. Cement and Concrete Research, 2014, 63, pp. 98-104. ⟨10.1016/j.cemconres.2014.05.006⟩. ⟨hal-01205526⟩
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