Through Pore Size Distribution and Kinetics of the Carbonation Reaction of Portland Cement Mortars

Through pores of hardened cement mortars were studied by gas transfer experiments. The permeabilities were the same for N 2 and H 2 . The pore size distribution of through pores was examined by back diffusion; the method was simplified by combining H 2 and N 2 gases. The permeability calculated from these results agreed with the experimental values of N 2 and H 2 . The neutralization rate of hardened cement was expressed as L 2 =kθ(t‐t i ). The rate of neutralization was determined by the gas diffusion of both CO 2 and H 2 O.