Gas permeability of concrete in relation to its degree of saturation

摘要

Permeability, along with diffusion and absorption, is used to quantify durability characteristics of a concrete. The measured value of gas permeability of concrete Depends strongly on its degree of saturation. Moreover, When the size of pores is of the same order of magnitude As the mean free path of molecules of the percolating gas, There is some molecular flow which violate the assump- Tins of the Darcy's law. As a result, the coefficient of per- Meability varies with the applied pressure.