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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)

  • 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)
  • Received : 2013.11.25
  • Accepted : 2014.06.20
  • Published : 2014.06.25
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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

References

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