Abstract

In this paper, cubic concrete specimens with the dimensions of 150mm×150mm×150mm were prepared. Artificial acid rain environment was simulated by the mixture sulfate and nitric acid solutions with pH level of 1.5/2.5 in the laboratory. The concrete specimens were immersed in the acid solution for the prescribed period. The meso-structure of the specimens experiencing various damage conditions was investigated by computerized tomography (CT).The distributions of the aggregate, mortar, and pore character in the concrete specimens were observed by Image Segmentation Technology. The mechanical properties of concrete under uniaxial compression load were studied. The strain distribution in concrete specimens with various damage states was examined. Based on RFPA2D, the failure and crack initiation/propagation of concrete under uniaxial compression load were examined. Failure modes of concrete specimens under various acidic damage states were determined. The evolution of meso-mechanics performance of concrete under various acidic damage states was discussed. Based on MIMICS, the 3D numerical model of the concrete specimens was reconstructed. The results indicate that concrete has various failure modes under various damage states. As the conditioning continued, the earlier crack initiation and severe crack propagation in the concrete specimens was obtained. The earlier crack initiation and severe crack propagation provide an innovative way to explain the degeneration of mechanical performance of concrete exposed to the acid environment.

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