CO2 mineralization of cement-based materials by accelerated CO2 mineralization and its mineralization degree: A review

After the CO 2 mineralization reaction of cement-based materials, on the one hand, the microstructure of the materials is improved, and the hardening performance is improved. On the other hand, CO 2 is effectively stored and good environmental benefits are generated. This paper reviews the thermodynamic and kinetic models of mineralization of cement-based materials. Secondly, the variation of pore structure and the durability of cement-based materials after CO 2 mineralization were reviewed. Then, the factors influencing mineralization degree in ordinary Portland cement system, non-hydrated silicate system, active magnesia system and recycled concrete waste were reviewed. On this basis, the fundamental problem of limiting the degree of mineralization of cement-based materials was identified, i.e., the CO 2 mineralized product layer limits the dissolution of Ca 2+ and the diffusion of CO 2 .