Investigations on Water Vapor Adsorption-Desorption of Cementitious Materials and Its Induced Permeability under Isothermal Steady-State Flow

H2O(g) adsorption-desorption of cementitious materials and their permeability is a vital indicator for their durability designs, which significantly affects the occurrences of corrosion, carbonization and freeze-thawing, but its quantitative characterization has yet to be investigated in depth. In this study, H(2)O((g) )adsorption-desorption of cementitious materials with various w = cratios (0.35-0.55)and its induced permeability were investigated using a self-created cup apparatus under isothermal steady-state flow and compared with N-2 gas permeability by the modified Cembureau method. The results showed that the cementitious materials with a low w = c ratio have stronger water-holding characteristics, and there is an obvious inflection point in the adsorption curve [i.e., relative humidity (RH) = 70%]center dot H(2)O((g) )permeability measurement of cementitious materials was successfully carried out using a self-created cupapparatus, which is fundamentally an exponential function relationship to its N-2 gas permeability. The conversion relation is helpful to enhance the multimedium evaluations of durability for cementitious materials.DOI:10.1061/JMCEE7.MTENG-16442.(c) 2023American Society of Civil Engineers.