Corrosion Mechanism of Acid Rain on Surface Structure of Concrete
YUAN Xiaolu1,*, LI Beixing2, ZHU Wenkai2, ZHANG Yaming2, WANG Kai2
1 Key Laboratory of Geological Hazards on Three Gorges Reservoir Area (China Three Gorges University), Ministry of Education, Yichang 443002, Hubei, China 2 China State Key Laboratory of Silicate Materials for Architecture, Wuhan University of Technology, Wuhan 430070, China
Abstract: The surface structure of concrete is important to influence the durability of concrete and the protective layer of reinforcing bars under acid rain. However, there is a lack of research on the corrosion mechanism of acid rain on the surface structure of concrete. The concrete properties including the accumulative acid consumption, the neutral depth, the mass and the strength were measured. The experimental results about these concrete properties were applied with X-ray diffraction, scanning electron microscope and the theoretical analysis, to study the corrosion mechanism of concrete surface structure subjected to acid rain. Results indicate that the concrete surface structure has high porosity and much hardened cement paste, which makes acid rain corrode faster. Some Ca(OH)2 in the hardened cement paste are dissolved, and the others react to form CaSO4·2H2O. Calcium silicate hydrate, calcium aluminate hydrate and ettringite decompose into CaSO4·2H2O,Al2O3·nH2O and CaSO4·2H2O, among which Al2O3·nH2O dissolves by reacting with H+. Increase of sand content ratio and the addition of polypropylene fibers significantly promote the resistance of concrete to the corrosion of acid rain, by improving the surface structure of concrete.
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2022, Vol. 36 
