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Advances in Concrete Construction
  Volume 2, Number 2, June 2014, pages 145-162

Fracture toughness of high performance concrete subjected to elevated temperatures Part 1 The effects of heating temperatures and testing conditions (hot and cold)
Binsheng Zhang, Martin Cullen and Tony Kilpatrick

    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
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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