Mechanism of interaction between hydration–carbonation of C2S

Abstract

The physical and microscopic properties of γ-C2S and β-C2S under hydration, carbonation, and hydration–carbonation cycle reactions were investigated. The hydration–carbonation cycle reaction facilitated the carbon sequestration of C2S, and the generation of CaCO3 filled the pores of the matrix and enhanced the matrix density in the carbon fixation reaction process. In the subsequent hydration and reaction process, the formation of hydration products increased the number of pores in the matrix and reduced the matrix density. Post-hydration, γ-C2S slurry became powder and had no mechanical strength. However, after carbonation reaction and two carbonation–hydration cycles, γ-C2S exhibited better mechanical properties than β-C2S.