The evolution of physical and mechanical properties of concrete specimens under acid corrosion
WANG Hui1, HUANG Xin1,2*, JIN Guolong1,3
1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. College of Civil Engineering and Architecture, Xinjiang University, Urumqi 830047, Xinjiang, China; 3. China Shipbuilding NDRI Engineering Co., Ltd., Shanghai 200063, China
Abstract In order to analyze the influence of sulfuric acid corrosion on the mechanical properties of the deep water storage and sewage tunnel lining structure(short for “deep tunnel”), this research carried out sulfuric acid corrosion tests with initial pH=1 on the standard concrete specimens with a steel fiber volume ratio of 0% and 1%, and considered two corrosion conditions of single-face and all-face immersion. The surface pH value, mass change rate, uniaxial compressive strength and reaction products of concrete specimens under different corrosion time were systematically analyzed. The results showed that the concrete's strength changed nonlinearly with corrosion time. Because the addition of steel fiber resists the diffusion of sulfuric acid, the reaction process in the early stage of corrosion was slowed down and the reaction products were reduced. Therefore, the strength and quality of steel fiber concrete under acid corrosion immersion did not change as rapidly as that of plain concrete under the same condition. The mass increase rate of concrete specimens under all-face immersion was greater than that of specimens soaked on one side under the same conditions. Combined with XRD analysis, it could be seen that gypsum was formed after reaction. The contact area between all-face corrosion and sulfuric acid was larger, so the reaction products were generated faster, and the corresponding strength and mass increase were also faster.
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