2015 CSCE Annual Conference Regina - Building on our Growth Opportunities

2015 CSCE Annual Conference Regina - Building on our Growth Opportunities Conference


Title
Bond Strength of GFRP Bars in Concrete at High Temperature

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Author(s)
Mr. Hamzeh Hajiloo, Queens University
Dr. Mark Green, Queen's University (Presenter)
Abstract

The polymer matrixes currently used for the fabrication of fibre reinforced polymer (FRP) reinforcing bars soften at temperatures approaching the glass-transition temperature (Tg) resulting in reduction of mechanical properties and loss of effectiveness in structural applications. In this paper, the effect of high temperature on the bond between one of the commercially available glass fibre reinforced polymer (GFRP) reinforcing bars and concrete is studied experimentally. Most of the previous experiments have been conducted on smaller sizes, while in many applications larger GFRP bars are used. The bond properties in the temperature range from 20 to 200 °C were studied for the bars of #5(16 mm nominal diameter). Test results showed a reduction of between 14 and 84 % in the bond strength as the temperature increased from 60 to 200 °C, respectively. At elevated temperatures, sand-coated bars showed a high sensitivity to high temperature in terms of bond strength since it relies mostly on the resin at the interface of the bar’s core and the sand coating.