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This paper presents a study on the carbonation curing of hydraulic (i.e., ordinary portland cement, OPC) and non-hydraulic (i.e., calcium silicate based cement, CSC) cementitious materials. The primary components of CSC are low-lime calcium silicates such as rankinite, wollastonite, and pseudowollastonite. The major difference between CSC and OPC system is that the CSC system generates strength from the carbonation reaction while strength development of OPC system depends on the hydration reaction. Nonetheless, CSC can be used to prepare concrete with mechanical properties similar to that of OPC. Thermogravimetric analysis (TGA) was used to monitor the rate of carbonation of the paste samples. The CO2 sequestration capacity of OPC was found to be slightly (~3%) higher than that of the CSC.

Carbonation Reaction Kinetics, CO2 Sequestration Capacity, and Microstructure of Hydraulic and Non-Hydraulic Cementitious Binders