Mechanical and bond properties of new generation of carbon fibre reinforced polymer reinforcing bars for concrete structures
| Autor: | Kader Laoubi, B. Tighiouart, Burong Zhang, Brahim Benmokrane, Isabelle Lord |
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| Rok vydání: | 2002 |
| Předmět: | |
| Zdroj: | Canadian Journal of Civil Engineering. 29:338-343 |
| ISSN: | 1208-6029 0315-1468 |
| Popis: | This paper presents laboratory test results on the mechanical properties and bond strength of new generation of carbon fibre reinforced polymer (CFRP) reinforcing bars used as nonprestressed reinforcement for concrete structures. Two types of CFRP reinforcing bars, namely, 9-mm-diameter CFRP ribbed bars and 9.5-mm-diameter CFRP sand-coated bars, were investigated. Tensile tests and pullout bond tests were conducted to evaluate the tensile properties and bond strength of the CFRP bars in comparison with that of the steel bar. Experimental results showed that the tensile stress-strain curves of the CFRP bars were linear up to failure. The ultimate tensile strength of the two types of CFRP bars was at least 1500 MPa, three times that of steel bars. The modulus of elasticity of two types of the CFRP bars was 128145 GPa, about 6575% that of steel. Furthermore, both types of the CFRP bars exhibited almost the same bond strength to concrete similar to steel bars. The minimum bond development length for the two types of CFRP bars seemed to be equal to about 20db for the sand-coated bars and 30db for the ribbed bars.Key words: fibre reinforced polymer (FRP), carbon FRP (CFRP), bar, mechanical properties, tensile strength, embedded length, pullout, bond strength, concrete structures. |
| Databáze: | OpenAIRE |
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