In this study, the crack healing performance of concrete containing microbial - based self - healing agent for the purpose of crack crack healing was evaluated by the permeability test. As a result of the addition of the microbial culture solution to the mixed water at an alternative ratio, the permeability recovery rate increases as the substitution rate increases. It is necessary to develop a microbial concentrate and to study the application of mixed microorganisms for the purpose of increasing the rate of permeability recovery and decreasing the substitution rate of microbial solution.

The purpose of this study is to estimate the permeability coefficient of concrete using mass hydrophobation agent. Experiments were carried out by making concrete specimens with different amounts of mass hydrophobation agent. It is considered that the pores are filled in the internal structure of the concrete by the expansion of the mass hydrophobation agent.

The purpose of this study is to estimate the permeability coefficient of concrete using mass hydrophobation agent. Experiments were carried out by making concrete specimens with different amounts of mass hydrophobation agent. It is considered that the pores are filled in the internal structure of the concrete by the expansion of the mass hydrophobation agent.

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