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Advances in Materials Science and Engineering
Volume 2014 (2014), Article ID 452763, 8 pages
Research Article

Toughness Calculation of Postfire Normal Concrete

1College of Civil Engineering, Tongji University, Shanghai 200092, China
2College of Urban Construction and Administration, Yunnan University, Kunming 650091, China

Received 5 October 2013; Revised 7 January 2014; Accepted 7 January 2014; Published 19 February 2014

Academic Editor: Filippo Berto

Copyright © 2014 Qingyang Chen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Fracture tests of postfire normal concrete with ten temperatures up to 600°C are implemented. Residual fracture toughness using analytical method is determined. Two situations are divided at critical load when calculating the cohesive fracture toughness. The initial and critical fracture toughness could be calculated from the complete load-crack opening displacement curves. Finally, the validation of double-K fracture model to the postfire concrete specimens is proved.