PREDICTION MODEL FOR CARBONATION OF CONCRETE STRUCTURE CONSIDERING HEAT AND MOISTURE TRANSFER

Abstract

In order to evaluate influences of rain on carbonation process of concrete structure, an analytical model was proposed for predicting carbonation process coupled with heat and moisture transfer, particularly liquid movement. The accelerated carbonation experiment under the isothermal condition in a literature was simulated by using the proposed model, in which the coefficients of moisture transfer and CO_2 diffusion were estimated by comparing the simulation results with the experimental results. By using the coefficients corresponding to the water cement ratio and the curing condition, this model can predict carbonation progress well. The simulation results also showed that the liquid transfer significantly influenced the carbonation process even under the rainless condition such as evaporating process after placing.