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Title: Macrocrack propagation in concrete specimens under sustained loading: Study of the physical mechanisms

Abstract

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.

Authors:
; ; ; ;
Publication Date:
OSTI Identifier:
22395921
Resource Type:
Journal Article
Journal Name:
Cement and Concrete Research
Additional Journal Information:
Journal Volume: 63; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0008-8846
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CONCRETES; CRACKING; CRACKS; CREEP

Citation Formats

Rossi, Pierre, E-mail: pierre.rossi@lcpc.fr, Boulay, Claude, Tailhan, Jean-Louis, Martin, Eric, and Desnoyers, Dominic. Macrocrack propagation in concrete specimens under sustained loading: Study of the physical mechanisms. United States: N. p., 2014. Web. doi:10.1016/J.CEMCONRES.2014.05.006.
Rossi, Pierre, E-mail: pierre.rossi@lcpc.fr, Boulay, Claude, Tailhan, Jean-Louis, Martin, Eric, & Desnoyers, Dominic. Macrocrack propagation in concrete specimens under sustained loading: Study of the physical mechanisms. United States. doi:10.1016/J.CEMCONRES.2014.05.006.
Rossi, Pierre, E-mail: pierre.rossi@lcpc.fr, Boulay, Claude, Tailhan, Jean-Louis, Martin, Eric, and Desnoyers, Dominic. Mon . "Macrocrack propagation in concrete specimens under sustained loading: Study of the physical mechanisms". United States. doi:10.1016/J.CEMCONRES.2014.05.006.
@article{osti_22395921,
title = {Macrocrack propagation in concrete specimens under sustained loading: Study of the physical mechanisms},
author = {Rossi, Pierre, E-mail: pierre.rossi@lcpc.fr and Boulay, Claude and Tailhan, Jean-Louis and Martin, Eric and Desnoyers, Dominic},
abstractNote = {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.},
doi = {10.1016/J.CEMCONRES.2014.05.006},
journal = {Cement and Concrete Research},
issn = {0008-8846},
number = ,
volume = 63,
place = {United States},
year = {2014},
month = {9}
}