Simulation of accelerated carbonation in concrete due to porosity and damage evolution
Damage in concrete induced by external loading accelerates the carbonation process.This study introduced porosity and dam-age variables to modify the diffusion coefficient in the medium transport equation,developing Papadakis's classical carbonation model.A concrete carbonation model was constructed with porosity and damage degree as independent variables under specific external environ-ments.A random aggregate model reflecting the microstructural characteristics of concrete was established,and the transport-reaction process of CO2 within concrete was simulated using the finite element method.The study explored the patterns of change in medium con-centration and porosity,as well as the development of carbonation and damage evolution processes under the combined effects of external loading and a moist-thermal environment.Results indicate that the action of external loading increases both the depth and non-uniformity of concrete carbonation.These findings reveal the mechanism of accelerated carbonation in concrete under loading,providing references for durability design and life prediction of concrete.
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维普
