A review of Portland cement carbonation mechanisms in CO_2 rich environment.

摘要

Experimental results of Portland cement reactivity in CO_2 rich fluids have so far seemed inconsistent, providing different values of reaction rates for apparently similar experimental conditions. Coupled transport -reaction models allow reconciling experiment al evidence within a consistent framework. Experimental and numerical results suggest two classes of controlling mechanism. For Class G/H cements, either reactivity is Ca or CO_2 diffusion-limited, depending on the boundary conditions, or reactivity stops because of pore clogging by calcium carbonate formation.