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Effect of freeze-thaw damage on corrosion and bond slip behavior of reinforcement in reinforced concrete

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Document pages: 12 pages

Abstract: This paper mainly studies the corrosion behavior of reinforcement in various reinforced concrete under freeze-thaw environment. The influence of concrete cover thickness is also discussed. In addition, the bond slip behavior of reinforced concrete after freeze-thaw damage and reinforcement corrosion is also introduced. The results show that the freeze-thaw damage intensifies the corrosion of reinforcement in concrete, and the corrosion of reinforcement in concrete is more obvious after serious freeze-thaw damage. Compared with ordinary concrete, air entrained concrete and waterproof concrete have better corrosion resistance to reinforcement in the same freeze-thaw environment. In addition, increasing the thickness of concrete cover is also an effective method to improve the resistance of concretee to steel corrosion. The bond-slip behavior of reinforced concrete with corroded steel decreases with the increase of freeze-thaw damage, especially for the concrete that suffered high freeze-thaw cycles. Moreover, there exists a good correlation between the parameters of bond-slip and freeze-thaw cycles. The steel corrosion and bond-slip behavior of reinforced concrete should be considered serious under freeze-thaw cycles environment, which significantly impact the durability and safety of concrete structure.

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