Effect of High Temperature on Bond Strength of FRP Rebars

Katz, Ammon; Berman, Neta; Bank, Lawrence C.

doi:10.1061/(asce)1090-0268(1999)3:2(73)

Cited by 146 publications

(62 citation statements)

References 6 publications

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“…When used as reinforcement for concrete, the bond between the FRP rebars and the concrete, which is critical for overall member strength, depends not on the fibres but primarily on the properties of the polymer matrix. The polymer matrix can be expected to deteriorate very rapidly under exposure to high temperature, and it is thus possible that the bond between the FRP and the concrete could be lost at temperatures well below the critical temperatures quoted above (Katz et al, 1999). Current fire design guidelines do not appear to be concerned with the effects of bond degradation.…”

Section: Unresolved Issuesmentioning

confidence: 99%

Evaluation of Fire Endurance of Concrete Slabs Reinforced with Fiber-Reinforced Polymer Bars

Kodur

Bisby

2005

J. Struct. Eng.

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. Engineering, 131, 1, pp. 34-43, 2005-01-01 Evaluation of fire endurance of concrete slabs reinforced with FRP bars Kodur, V. K. R.; Bisby, L. A. Journal of Structural

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Section: Unresolved Issuesmentioning

confidence: 99%

Evaluation of Fire Endurance of Concrete Slabs Reinforced with Fiber-Reinforced Polymer Bars

Kodur

Bisby

2005

J. Struct. Eng.

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“…The bond strength of aramid fiber-PH FRP bars at high temperature was lower than that of carbon fiber-PH FRP bars, because the heat resistance of aramid fiber is lower than that of carbon fiber. It has been demonstrated by others that the bond strength of FRP bars strongly depends on the glass transition temperature (GTT) of a matrix resin (Freismanis et al1998, Katz et al 1999, Katz et al 2000, Mutsuyoshi et al 2004, and Dai et al 2006. In addition to the results of previously reported papers, the heat resistance of the fiber itself will be important when the heat resistance of the matrix resin is improved.…”

Section: Pull-out Testmentioning

confidence: 91%

Mechanical Properties of Newly Developed Heat-Resistant FRP Bars

Sumida¹,

Mutsuyoshi

2008

ACT

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This paper presents a basic research into newly developed heat-resistant fiber reinforced polymer (FRP) bars. The heat resistance of commercially available FRP bars is low because of the low heat resistance of the resins used for the matrix such as epoxy (EP), unsaturated polyester (USPE) and vinyl ester (VE). The authors investigated new heat-resistant resins suitable for the production of FRP bars, and resol type phenolic (PH) and M type cross-linked polyester-amide (CP) resins were selected for bar fabrication and testing. Six different types of FRP bars made with carbon fiber or aramid fiber and PH, CP or EP matrix resin were prepared. The heat resistance of each bar was evaluated by tensile tests during and after heating. To assert the durability of the bars, an alkaline resistance test was performed. Pull-out tests and flexural tests of concrete members reinforced with the newly developed FRP bars and those with steel bars were also performed at normal temperature (20°C) and high temperatures. The test results indicate that the heat resistance of the FRP bar specimens made with PH or CP matrix resin was higher than that of the specimens made with EP matrix resin, and that the heat resistance of reinforcing fiber was essential for improvement of the heat resistance of the matrix resin. Of particular note is the fact that the heat resistance of FRP bars made with carbon fiber and PH matrix resin was found to be almost the same as that of steel bars.

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“…The bond perhaps is the first mechanism likely to be affected at elevated temperature. A reduction of 40% in the bond strength of a steel bar was found at a temperature of 200 o C whereas FRP bars may loose 80 to 90% of the bond strength in the temperature range of 200-250 o C (Katz et al 1999). The mechanics of deterioration of bond in FRP and steel RC structures differ in various aspects (at high temperatures) but common bond deteriorating factors also exist.…”

Section: Bond Consideration At Elevated Temperaturesmentioning

confidence: 97%

“…The bond strength of FRP bars with concrete relies on the properties of the surface layer and more importantly on the polymer at the bar surface . The loss of bond strength in FRP reinforced structures is not caused by the deterioration in concrete material properties (Katz et al 1999). Two major factors that are likely to affect the bond of a FRP bar with concrete are given below.…”

Section: Bond Consideration At Elevated Temperaturesmentioning

confidence: 99%

Experimental Behaviour of Carbon FRP Reinforced Concrete Beams at Ambient and Elevated Temperatures

Rafi

Nadjai

2008

ACT

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The applications of fibre reinforced polymer (FRP) bars in buildings can provide a potential market for their use. Since buildings may be exposed to elevated temperatures, the behaviour of carbon FRP (CFRP) reinforced concrete (RC) beams was studied at high temperatures and compared with normal temperature behaviour. Steel RC beams were used as control specimens. The failure modes of beams at normal and elevated temperatures were found to be the same. The stiffness of cracked FRP RC was less than steel reinforced concrete at normal temperature whereas FRP reinforced beams were stiffer than steel RC beams at elevated temperatures.

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Effect of High Temperature on Bond Strength of FRP Rebars

Cited by 146 publications

References 6 publications

Evaluation of Fire Endurance of Concrete Slabs Reinforced with Fiber-Reinforced Polymer Bars

Evaluation of Fire Endurance of Concrete Slabs Reinforced with Fiber-Reinforced Polymer Bars

Mechanical Properties of Newly Developed Heat-Resistant FRP Bars

Experimental Behaviour of Carbon FRP Reinforced Concrete Beams at Ambient and Elevated Temperatures

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