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The Carbonation of Cement-Based Materials with Different Aggregate Content

The aggregate occupies most of the volume of the concrete; it significantly affects the diffusion of CO2 in the concrete. In this study, we adopted the accelerated carbonation test to investigate the effect of the aggregate content and paste thickness on the carbonation resistance of cement-based materials. Results showed that for the mortar specimens, 44% was the critical percolation sand volume. Within the critical volume, the dilution and tortuosity effects were in the dominant position; while over the critical volume, the interfacial transition zone (ITZ) and percolation effects were in the dominant position. For the concrete specimens, the paste thickness had good correlation with the concrete carbonation depth: the paste thickness increased and the carbonation depth showed a decrease tend; otherwise, the paste thickness decrease and the carbonation depth showed an increase tend.