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The structure of the calcium silicate hydrate phases present in hardened pastes of white Portland cement/blast-furnace slag blends

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Abstract

The C-S-H gels present in both water- and alkali-activated hardened pastes of white Portland cement/blast-furnace slag blends have been studied by solid-state 29Si magic angle spinning nuclear magnetic resonance (NMR) spectroscopy and analytical transmission electron microscopy (TEM). Structural data are obtained by NMR for the semi-crystalline C-S-H gels in the alkali-activated systems and extended to the nearly amorphous gels in the water-activated systems by peak broadening; unambiguous chemical analyses are determined in the TEM. The following conclusions apply to both the semi-crystalline and nearly amorphous C-S-H gels: (1) aluminium substitutes for silicon at tetrahedral sites; (2) aluminium only substitutes for silicon in the central tetrahedron of pentameric silicate chains; (3) the results strengthen confidence in dreierkette-based models for the structure of C-S-H. Compositional similarities suggest that these conclusions will be true for OPC/slag blends, and possibly also for OPC/pulverized fuel ash blends indicating that the same structural model applies to C-S-H gels in a wide range of hardened cement pastes.

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Authors and Affiliations

  1. Materials Unit, Department of Civil Engineering, University of Leeds, Leeds, LS2 9JT, UK

    I. G Richardson

  2. Department of Materials, University of Oxford, Parks Road Oxford, OX1 3PH, UK

    G. W Groves

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  1. I. G Richardson
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  2. G. W Groves
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Richardson, I.G., Groves, G.W. The structure of the calcium silicate hydrate phases present in hardened pastes of white Portland cement/blast-furnace slag blends. Journal of Materials Science 32, 4793–4802 (1997). https://doi.org/10.1023/A:1018639232570

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