In situ Raman analysis of hydrating C₃A and C₄AF pastes in presence and absence of sulphate

L. BlackMaterials & Engineering Research Institute, Sheffield Hallam University, Howard Street, Sheffield, S1 1WB, UKCorrespondence[email protected]

C. BreenMaterials & Engineering Research Institute, Sheffield Hallam University, Howard Street, Sheffield, S1 1WB, UK

J. YarwoodMaterials & Engineering Research Institute, Sheffield Hallam University, Howard Street, Sheffield, S1 1WB, UK

J. PhippsSchlumberger Cambridge Research, High Cross, Madingley, Cambridge, CB3 0EL, UK

G. MaitlandDepartment of Chemical Engineering, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK

Abstract

Raman spectroscopy has been used to follow the hydration of C₃A and C₄AF, two of the principal components of ordinary Portland cement (OPC), in the absence and presence of calcium sulphate (gypsum). Raman spectroscopy enabled in situ, real time analysis of the hydrating pastes. Analysis of the pastes by X-ray diffraction complemented the Raman data and confirmed sample composition. Subtle changes in the Raman spectra of the different pastes illuminated differences in hydration behaviour between C₃A and C₄AF. The similarities and differences between the various systems are discussed. The influence of carbon dioxide on the hydration products has also received attention.

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In situ Raman analysis of hydrating C₃A and C₄AF pastes in presence and absence of sulphate

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In situ Raman analysis of hydrating C₃A and C₄AF pastes in presence and absence of sulphate