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Numerical simulation of carbonation depth of concrete structure with time and temperature

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Document pages: 16 pages

Abstract: In order to further understand the carbonation process of concrete structure, according to the law of CO2 mass conservation, the diffusion process of CO2 in concrete with time and temperature is simulated, and the two-dimensional mass transfer equation of CO2 diffusion in concrete is established. The concrete block is discretized into triangular elements, and the CO2 concentration at different positions is calculated by finite element method. The calculation algorithm is programmed on MATLAB platform. The model considers the time and temperature dependence and the difference of CO2 concentration at different locations of the structure. Then, accelerated carbonation tests were carried out with concrete blocks with different proportionstions to investigate the influence of the water-cement ratio and temperature on the concrete carbonation. The experimental results effectively verify the correctness of the finite element model, and the proposed finite element method reasonably simulates the concrete carbonation through calculating the carbonation in practical engineering compared with other methods in references. An experimental-numerical correlation has been performed. The ratio of carbonation depth at the corner of the concrete members to the other positions is about 1.35. The carbonation depth is increased about 1.9 times when the temperature changes from 20°C to 40°C.

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