Gas permeability is a substantial parameter for understanding the durability performance of concrete and its micro‐structural densification. Nevertheless, it is very rate to deal with the effect of carbonation on the parameter. In this paper, it is introduced to define transport coefficient of carbonated concrete such as gas permeability coefficient Kg. These are expressed as time function considering hydration evolution of hardened cement paste. The definition of the material parameters is a prerequisite to simulate the deterioration of concrete as time elapsed

• 윤인석(인덕대학교 건설정보과 교수) | Yoon, In Seok