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Materials 2018, 11(3), 346; https://doi.org/10.3390/ma11030346

Residual Tensile Strength and Bond Properties of GFRP Bars after Exposure to Elevated Temperatures

1
Ellis Engineering & Construction Management Services, LLC, Milwaukee, WI 53212, USA
2
Department of Civil and Environmental Engineering, University of Wisconsin, Milwaukee, WI 53211, USA
*
Author to whom correspondence should be addressed.
Received: 11 January 2018 / Revised: 22 February 2018 / Accepted: 24 February 2018 / Published: 27 February 2018
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Abstract

The use of fiber reinforced polymer (FRP) bars in reinforced concrete members enhances corrosion resistance when compared to traditional steel reinforcing bars. Although there is ample research available on the behavior of FRP bars and concrete members reinforced with FRP bars under elevated temperatures (due to fire), there is little published information available on their post-fire residual load capacity. This paper reports residual tensile strength, modulus of elasticity, and bond strength (to concrete) of glass fiber reinforced polymer (GFRP) bars after exposure to elevated temperatures of up to 400 °C and subsequent cooling to an ambient temperature. The results showed that the residual strength generally decreases with increasing temperature exposure. However, as much as 83% of the original tensile strength and 27% of the original bond strength was retained after the specimens were heated to 400 °C and then cooled to ambient temperature. The residual bond strength is a critical parameter in post-fire strength assessments of GFRP-reinforced concrete members. View Full-Text
Keywords: temperature effects; post-fire strength; glass fiber reinforced polymer bars; construction materials; reinforced concrete; high temperature properties temperature effects; post-fire strength; glass fiber reinforced polymer bars; construction materials; reinforced concrete; high temperature properties
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Ellis, D.S.; Tabatabai, H.; Nabizadeh, A. Residual Tensile Strength and Bond Properties of GFRP Bars after Exposure to Elevated Temperatures. Materials 2018, 11, 346.

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