Influence of Corrosion Inhibitor on Durability of Reinforced Concrete in Golmud Salt Lake Area

Abstract

Abstract: Corrosion inhibitors are usually used to alleviate steel corrosion in concrete, and whether the types of corrosion inhibitors have a certain impact on the concrete durability needs further research. Therefore, concrete mixed with Ca(NO₂)₂ (also known as CAN) and C₄H₁₁NO (also known as CN) were prepared, and field exposure tests were conducted on the two specimens in the Golmud salt lake area. The electrochemical experiment, ultrasonic testing and quality testing were conducted respectively every three months. The durability was analyzed from three aspects: steel corrosion in concrete, crack formation of concrete and quality loss of concrete. The results show that the internal steel of two groups reaches to a low corrosion state at 180 d, and the internal steel of groups A and B reach to a medium corrosion state and a low corrosion state at 810 d. At 810 d, the ω₁ (relative quality evaluation parametes) values of groups A and B are 0.42 and 0.46, and the ω₂ (relative dynamic modulus of elasticity evaluation parametes) values are 0.47 and 0.53, respectively. After 180 d of exposure, ω₁ and ω₂ values of group A are smaller than those of group B. At 810 d, the maximum cracks on the surface of groups A and B reach about 0.15 mm and 0.11 mm, respectively. Corrosion inhibitor CN improves the durability of concrete better than CAN。

Key words: concrete, durability, corrosion inhibitor, steel corrosion, electrochemistry, ultrasonic

CLC Number:

TU528

WANG Chengping, ZHANG Jiasheng. Influence of Corrosion Inhibitor on Durability of Reinforced Concrete in Golmud Salt Lake Area[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(3): 784-791.

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