Anti-Corrosion Techniques of Bridge Pile Foundation Concrete in High-Concentration Sulfate Environment

Abstract

Abstract: As the demand for sulfate resistance of pile foundation concrete of a highway bridge in the Southwest of China, the influences of anti-corrosion techniques on concrete compressive strength, corrosion resistance coefficient of compressive strength and sulfate-ion transport under 10% (mass fraction)-sulfate solution were investigated. The mechanism of anti-corrosion techniques was analyzed by air-void structure and micro morphology. The results show that the corrosion resistance of "expansive agent with supplementary cementitious materials" admixtures is excellent in the early stage but serious in the later period, and the corrosion resistance of "salt crystallization inhibition" admixtures is better in the long term. Supplementary cementitious materials and "expansive agent with supplementary cementitious materials" admixtures delay the corrosion of sulfate mainly by improving the compactness and optimizing the pore size distribution, while "salt crystallization inhibition" admixtures not only optimize the pore structure of concrete to a certain extent, but also inhibit the formation of crystalline expansion products.

Key words: anti-corrosion technique, bridge engineering, pile foundation concrete, mechanical property, sulfate attack, microstructure

CLC Number:

TU528

MU Song, GUO Zheng, LIU Guangyan, ZHOU Ying, XIE Deqing, CAI Jingshun, LIU Kai. Anti-Corrosion Techniques of Bridge Pile Foundation Concrete in High-Concentration Sulfate Environment[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(4): 1213-1219.

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