High Temperature Residual Properties of Externally-Bonded FRP Systems

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Title: High Temperature Residual Properties of Externally-Bonded FRP Systems

Author(s): S.K. Foster and L.A. Bisby

Publication: Special Publication

Volume: 230

Issue:

Appears on pages(s): 1235-1252

Keywords: fiber-reinforced polymers; fire; high-temperature residual properties; reinforced concrete; strengthening

Date: 10/1/2005

Abstract:
The use of externally-bonded FRP plates and sheets to strengthen existingreinforced concrete structures is now widely recognized. However, a primary concernthat still discourages the use of FRPs in some cases is their assumed susceptibility tofire. While recent studies have demonstrated that the overall performance ofappropriately designed and insulated FRP-strengthened reinforced concrete membersis satisfactory, the specific behavior of FRP materials at high temperature and afterexposure to high temperature remains largely unknown, particularly for externally-bonded FRP strengthening systems. As a first step in an effort to learn more about thehigh temperature properties of these systems, an initial series of tests is presented tostudy the high temperature residual properties of externally-bonded carbon and glassFRP systems for concrete. Axial tension tests, single-lap bond tests, thermogravimetricanalysis, and differential scanning calorimetry are all used to elucidate hightemperature residual performance. The potential consequences of these initial resultsfor the fire-safe design of FRP-strengthened reinforced concrete members arediscussed.