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A study of the pozzolanic reaction by solid-state 29Si nuclear magnetic resonance using selective isotopic enrichment

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Abstract

The hydration of a mixture of tricalcium silicate and silica has been studied by 29Si solid-state nuclear magnetic resonance, using selective enrichment of the reactants with 29Si in order to follow and compare the behaviour of the silicon nuclei originating from either source. This approach shows for the first time that the silicon atoms from the two components are not equilibrated throughout the hydration products but are preferentially located in distinct species. In particular, from the distinctive spectra observed when the silica only is enriched, it is concluded that the part of the calcium silicate hydrate gel formed which incorporates silicon from this source has a longer chain length and a slightly better-ordered structure than the remainder. The spectra obtained with selective enrichment are interpreted in terms of a model based on a dreierkette chain structure for C-S-H.

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Author notes

  1. A. R. Brough

    Present address: Department of Materials, University of Oxford, Oxford, UK

  2. I. G. Richardson

    Present address: Materials Unit, Department of Civil Engineering, University of Leeds, Leeds, UK

Authors and Affiliations

  1. Inorganic Chemistry Laboratory, University of Oxford, Oxford, UK

    A. R. Brough, C. M. Dobson & I. G. Richardson

  2. Centre for Advanced Cement Based Materials, University of Illinois at Urbana Champaign, Urbana, IL, USA

    I. G. Richardson & G. W. Groves

Authors
  1. A. R. Brough
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  2. C. M. Dobson
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  3. I. G. Richardson
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  4. G. W. Groves
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Brough, A.R., Dobson, C.M., Richardson, I.G. et al. A study of the pozzolanic reaction by solid-state 29Si nuclear magnetic resonance using selective isotopic enrichment. JOURNAL OF MATERIALS SCIENCE 30, 1671–1678 (1995). https://doi.org/10.1007/BF00351595

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  • DOI: https://doi.org/10.1007/BF00351595

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