Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 73, Issue -, Pages 610-617Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2014.07.033
Keywords
Double-G fracture model; Post-fire; Normal strength concrete; Energy release rate
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Funding
- State Laboratory of Disaster Reduction in Civil Engineering [SLDRCE09-D-02]
- Young Scientist Project of Natural Science Foundation of China [NSFC: 51008235]
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According to the double-G fracture model (G means energy release rate), the residual fracture behavior of post-fire normal strength concrete is described. The initial fracture energy release rate and the unstable fracture energy release rate are termed to distinguish the different crack propagation stages. The difference between the two energy release rates, named as the cohesive energy release rate, is to be induced by taking into account the aggregate bridging interlock. In total ten temperatures and fifty specimens are considered. The double-G fracture parameters are then experimentally determined. Based on the assumed relationship among the three energy release rates, the calculated unstable fracture energy release rate is obtained. Finally the feasibility of the double-G fracture model is verified. (C) 2014 Elsevier Ltd. All rights reserved.
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