Enhanced analysis for early age hydration of cement using Si-NMR and high-speed and ultrasensitive XRD

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When industrial waste is utilized as the raw material for cement, C3A, which is a mineral of four major constitutes of cement increases because the industrial waste condenses high amount of aluminum. In this study, the hydration behavior of C3A, of which hydration rate is very fast, was in- vestigated by using a high-speed, ultra-sensitive XRD in combination of amorphous phase analysis with 27Al MAS NMR, and elucidated the reaction mechanism of C3A in more detail using thermodynamic phase equilibri-um and surface complexation models. The change in properties of C-S-H formed by the hydration reaction of C3S with the increase of Al content in the cement was also analyzed by using 29Si MAS NMR. In addition, the influence of increase of C3A content on the fluidity of cement paste was also investigated to evaluate the limitation of industrial waste usage in cement production.