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Advances in Materials Science and Engineering
Volume 2013, Article ID 143208, 13 pages
http://dx.doi.org/10.1155/2013/143208
Research Article

Average Fracture Energy for Crack Propagation in Postfire Concrete

College of Civil Engineering, Tongji University, Shanghai 200092, China

Received 20 September 2013; Accepted 20 October 2013

Academic Editor: Filippo Berto

Copyright © 2013 Kequan Yu 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.

Abstract

Wedge-splitting tests of postfire concrete specimens were carried out in the present research to obtain the load-displacement curves. Ten temperatures varying from room temperature to 600°C were employed. In order to calculate the accurate fracture energy, the tails of load-displacement curves were best fitted using exponential and power functions. Three fracture energy quantities (fracture energy , stable fracture energy , and unstable fracture energy ) with their variation tendency and their mutual relationship were determined to predict energy consumption for the complete fracture propagation. Additionally, the stable fracture work was also calculated. All these fracture parameters sustain an increase-decrease tendency which means that the fracture property of postfire concrete shares the same tendency.