Discussion of “Assessing concrete carbonation resistance through air permeability measurements” by R. Neves et al. [Construction and Building Materials 82(2015): 304–309

Abstract

In the original paper, the simple power function used correlates carbonation rate with air permeability in carbonated concrete rather than in non-carbonated concrete. However, the reported air permeability tests were conducted for non-carbonated concrete, which was not consistent with their theoretically-established function. This discussion modifies the original theoretical function through incorporation of a porosity-related term which connects air permeability in non-carbonated concrete with that in carbonated concrete. Consequently, a new analytical model to estimate carbonation resistance through air permeability in non-carbonated concrete is proposed and calibrated using experimental results reported in the original paper.