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Journal of Materials Science

, Volume 32, Issue 18, pp 4793–4802 | Cite as

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

  • I. G Richardson
  • G. W Groves
Article

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.

Keywords

Nuclear Magnetic Resonance Nuclear Magnetic Resonance Spectrum Calcium Silicate Hydrate Tobermorite Harden Cement Paste 

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Copyright information

© Chapman and Hall 1997

Authors and Affiliations

  • I. G Richardson
    • 1
  • G. W Groves
    • 2
  1. 1.Materials Unit, Department of Civil EngineeringUniversity of LeedsLeedsUK
  2. 2.Department of MaterialsUniversity of OxfordParks Road OxfordUK

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