Computers and Concrete

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Effect of high temperature on the bond performance between steel bars and recycled aggregate concrete

  • Yan, Lan-Lan (Faculty of Science, East China University of Technology) ;
  • Liang, Jiong-Feng (Faculty of Civil & Architecture Engineering, East China University of Technology) ;
  • Zhao, Yan-gang (Department of Architecture, Kanagawa University)
  • Received : 2018.08.17
  • Accepted : 2019.03.05
  • Published : 2019.03.25
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Abstract

The use of recycled aggregate concrete for the purpose of environmental and resource conservation has gained increasing interest in construction engineering. Nevertheless, few studies have reported on the bonding performance of the bars in recycled aggregate concrete after exposed to high temperatures. In this paper, 72 pull-out specimens and 36 cubic specimens with different recycled coarse aggregate content (i.e., 0%, 50%,100%) were cast to evaluate the bond behavior between recycled aggregate concrete and steel bar after various temperatures ($20^{\circ}C$, $200^{\circ}C$, $400^{\circ}C$, $600^{\circ}C$). The results show that the recycled aggregate concrete pull-out specimens exhibited similar bond stress-slip curves at both ambient and high temperature. The bond strength declined gradually with the increase of the temperature. On the basis of a regression analysis of the experimental data, a revised bond strength mode and peak slip ratios relationship model were proposed to predict the post-heating bond-slip behavior between recycled aggregate concrete and steel bar.

Keywords

Acknowledgement

Supported by : Chinese National Natural Science Foundation

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