Abstract
Drying shrinkage is one of the most important inducements to concrete cracking in long structures. To investigate the phenomenon of non-uniform shrinkage and the influence of concrete mix proportion on drying shrinkage, the theory of non-linear moisture diffusion was applied to model shrinkage in the long reinforced concrete structure with the original mix proportion and the optimised one. The three-dimensional numerical simulation was implemented based on the thermal–structural coupled analysis by ANSYS, considering the solution analogy between the moisture field and the temperature field. The moisture field and shrinkage induced stress field in concrete were calculated. The results show that the minimum relative humidity is greater, and the maximum humidity gradient is smaller in the structure with the optimised mix proportion than that in the structure with the original one due to the slower moisture diffusion. Consequently, the optimisation of mix proportion improves the cracking resistance prominently, for the cracking time and crack propagation are delayed significantly.
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