Abstract
This work aims to determine the fundamental similarities and/or differences between OPC and OPC/slag paste hydrates. OPC and 35% slag pastes are investigated using five techniques: 29Si NMR, 27Al NMR, X-ray diffraction (XRD), infrared (IR) and synchrotron near edge X-ray absorption fine structure (NEXAFS) spectroscopy. 29Si NMR provides valuable information related to the formation of the C–S–H gel, the main hydrated phase of the cement paste. 27Al NMR is a useful tool to characterize calcium aluminates and aluminate hydrates such as ettringite and monosulphate hydrate. XRD identifies polycrystalline phases of the hardened cement paste, including ettringite, monosulphate and CaOH2. Vibrational frequencies in IR assist in identifying the silicate, sulphate and carbonate phases of the cement paste. As far as we are aware, Si K-edge NEXAFS has never been applied in cement research and its advantages and disadvantages are discussed. Using these techniques, a comparison between OPC and 35% slag paste hydrates is made, shedding light on differences in the amount and form of hydrated phases present, especially the absence of ettringite in the 35% slag paste.
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Acknowledgements
The authors gratefully acknowledge the Australian Research Council Discovery Grant No. DP0558463 for this research project. Part of this research was undertaken on beamline 14ID-01 at the Australian Synchrotron, Victoria Australia. The views expressed are those of the authors and not necessarily those of the owner or operator of the Australian Synchrotron. J Cashion, B Cowie and R Hocking all kindly provided assistance. Finally, the authors would like to gratefully acknowledge Dr Jenny Pringle from Monash School of Chemistry for assistance with all NMR experiments.
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Mendes, A., Gates, W.P., Sanjayan, J.G. et al. NMR, XRD, IR and synchrotron NEXAFS spectroscopic studies of OPC and OPC/slag cement paste hydrates. Mater Struct 44, 1773–1791 (2011). https://doi.org/10.1617/s11527-011-9737-6
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DOI: https://doi.org/10.1617/s11527-011-9737-6