Abstract
Recently, some mathematical models for the prediction on progress of carbonation of concrete were reported. These models take account for CO2 diffusion and chemical reaction between Ca(OH)2 and CO2. Based on the assumption that CO2 dif- fuses in the carbonation zone and reacts with Ca(OH)2 at the outer face of carbonation zone and non-carbonation zone. In this study, a mathematical model to predict the progress of carbonation of concrete has been established based on the reducing concentration of Ca(OH)2 in the carbonation progress zone, where Ca(OH)2 reacts with CO2 and Ca(OH)2 and CaCO3 coexist. Also, the pre- diction model of carbonation progress rate of concrete using the air permeability coefficient regarding to CO2 diffusion is devel- oped. As a result of this study, an expression, the model equation is obtained for the prediction of carbonation based on the time and interaction velocity between CO2 and Ca(OH)2 dependent air permeability coefficient. The prediction by the model satisfied the experimental data of the accelerated carbonation for painted concrete. Consequently, the model can predict the rate of car- bonation and the potential service life of concrete structure exposed to atmosphere.
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