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Advances in Concrete Construction Volume 2, Number 2, June 2014 , pages 145-162 DOI: https://doi.org/10.12989/acc.2014.2.2.015 |
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Fracture toughness of high performance concrete subjected to elevated temperatures Part 1 The effects of heating temperatures and testing conditions (hot and cold) |
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Binsheng Zhang, Martin Cullen and Tony Kilpatrick
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| Abstract | ||
| In this study, the fracture toughness KIC of high performance concrete (HPC) was determined by conducting three-point bending tests on eighty notched HPC beams of 500 mm x 100 mm x 100 mm at high temperatures up to 450oC (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. KIC for the hot concrete sustained a monotonic decrease tendency with the increasing temperature, with a sudden drop at 105oC. For the cold concrete, KIC sustained a two-stage decrease trend, dropping slowly with the heating temperature up to 150oC and rapidly thereafter. The fracture energy-based fracture toughness KIC\' 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. | ||
| Key Words | ||
| high performance concrete; high temperature; fracture toughness; test conditions | ||
| Address | ||
| Binsheng Zhang, Martin Cullena and Tony Kilpatrickb: School of Engineering and Built Environment, Glasgow Caledonian University, Glasgow G4 0BA, Scotland, United Kingdom | ||
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