Recently, some mathematical models for the prediction on progress of carbonation of concrete were reported. These models were taking account of CO
2 diffusion and chemical reaction of Ca (OH)
2 and CO
2. These models were based on the assumption that CO
2 diffused in the carbonation zone and reacted with Ca (OH)
2 at the boundary face of carbonation zone and uncarbonation zone. In these models did not coexist. According to previous studies, however, it was know that Ca (OH)
2 and CaCO
3 do coexist in carbonation progress 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 CO
2 and Ca (OH)
2 and CaCO
3 coexist.
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