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http://dx.doi.org/10.12989/acc.2014.2.2.145

Fracture toughness of high performance concrete subjected to elevated temperatures Part 1 The effects of heating temperatures and testing conditions (hot and cold)  

Zhang, Binsheng (School of Engineering and Built Environment, Glasgow Caledonian University)
Cullen, Martin (School of Engineering and Built Environment, Glasgow Caledonian University)
Kilpatrick, Tony (School of Engineering and Built Environment, Glasgow Caledonian University)
Publication Information
Advances in concrete construction / v.2, no.2, 2014 , pp. 145-162 More about this Journal
Abstract
In this study, the fracture toughness $K_{IC}$ of high performance concrete (HPC) was determined by conducting three-point bending tests on eighty notched HPC beams of $500mm{\times}100mm{\times}100mm$ at high temperatures up to $450^{\circ}C$ (hot) and in cooled-down states (cold). When the concrete beams exposed to high temperatures for 16 hours, both thermal and hygric equilibriums were generally achieved. $K_{IC}$ for the hot concrete sustained a monotonic decrease tendency with the increasing temperature, with a sudden drop at $105^{\circ}C$. For the cold concrete, $K_{IC}$ sustained a two-stage decrease trend, dropping slowly with the heating temperature up to $150^{\circ}C$ and rapidly thereafter. The fracture energy-based fracture toughness $K_{IC}$' was found to follow similar decrease trends with the heating temperature. The weight loss, the fracture energy and the modulus of rapture were also evaluated.
Keywords
high performance concrete; high temperature; fracture toughness; test conditions;
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