Carbon dioxide sequestration on magnesium-based binders

Magnesium-based binders have attracted considerable interest for their potential for CO2 emissions reductions. Here, we initially introduce the chemical composition and hydration of these types of cement. The main reaction of carbon sequestration for the following cements—magnesium oxychloride, magnesium oxysulfate, magnesium phosphate, and magnesium silicate hydrate—is attributed to the transformation from reactive MgO into hydrated magnesium carbonates, which are similar to reactive magnesia cement binders. We thus discuss the carbonation mechanism of RMC-based materials and summarize the critical controlling factors. On this basis, carbonation influences on the mechanical performance of other magnesium-based binders and the key parameters controlling the carbonation process are presented.