Interface between Near-Surface-Mounted Carbon Fiber- Reinforced Polymer and Concrete in Thermal Distress

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Title: Interface between Near-Surface-Mounted Carbon Fiber- Reinforced Polymer and Concrete in Thermal Distress

Author(s): Yail J. Kim and Abdul R. Namrou

Publication: Structural Journal

Volume: 113

Issue: 1

Appears on pages(s): 29-38

Keywords: carbon fiber-reinforced polymer (CFRP); elevated temperatures; interface; near-surface-mounted (NSM); resistance factor; thermal

Date: 1/1/2016

Abstract:
This paper presents the interfacial response of near-surfacemounted (NSM) carbon fiber-reinforced polymer (CFRP) strips embedded along a concrete substrate at elevated temperatures. Two types of bonding agents are used: ordinary and high-temperature epoxies. The residual behavior of the interface, including the characteristics of individual constitutive materials, is examined when subjected to a temperature range varying from 25 to 200°C (77 to 392°F). Test results reveal that the residual strength of the concrete and CFRP is not influenced by thermal exposure; however, that of the adhesive is affected. The performance of the interface bonded with the ordinary epoxy is better than that with the high-temperature one without thermal distress, while the latter becomes superior to the former with an increase in temperature. The interaction between the adhesive and concrete controls the interfacial capacity and corresponding failure mode, rather than the individual strength of the materials. Probability-based simulation that can complement the limitation of the experimental investigation in terms of sample numbers is conducted to develop design factors.