NMR research on cement clinker and its structures in early age hydration

Abstract

Clinker has long been regarded as a critical factor for cement hydration and solidification. α-C₂S and β-C₂S in 2CaO·SiO₂(C₂S) phase and C₃S Monoclinic 1(C₃S M1) and C₃S Monoclinic 3 (C₃S M3) in 3CaO·SiO₂ (C₃S) phase were clearly recorded in the ²⁹Si MAS NMR spectra. The content of C₃S phase in the clinker deduced from the fine peak analysis coincides with the phase quantification analysis calculated by the Taylor-Bogue method based on XRF, which also accords to the statistical data in industrial production. NMR provides a proof that C₃S M1 and β-C₂S phases have a prior reaction in the early age hydration of clinker, and demonstrates that aluminum coordination changes from tetracoordinated 4CaO·Al₂O₃·Fe₂O₃(C₄AF) to hexacoordinated [Ca₂Al(OH)₆](SO₄)_0.3·3H₂O(Aft) in one day hydration and changes to the 3CaO·Al₂O₃·CaSO₄·nH₂O (Afm) in a seven-day hydration.

Keywords

NMR / clinker / cement / hydration

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