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The compositional and molecular character of the calcium silicate hydrates formed in the paste hydration of 3CaO·SiO2

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Abstract

Transmission electron microscopy has been used to determine the composition and characterize the molecular structure of the early calcium silicate hydrates formed in the paste hydration of 3CaO · SiO2. The initial surface hydrates were found to have a wide range of CaO/SiO2 compositions, consistent with the rapid and variable rate of dissolution of Ca2+ ions from only specific reactive surface sites. The very early surface hydrates appear disordered on a 1 nm scale. At later ages these become microheterogeneous, with more structurally ordered sheet-like fragments and regions developing within the disordered regions. Discrete 3 nm long and 1 nm thick fragments and more structurally ordered assemblies of these were observed. The basic molecular core structure was found to be a 1 nm thick sheet consisting of a protonated CaO x polyhedral layer sandwiched between short-chain silicate groups. In these paste hydrates, this layer extends for only 3 nm before disordering recurs.

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  1. E. Henderson

    Present address: Euroc Research AB, 22370, Lund, Sweden

Authors and Affiliations

  1. Department of Engineering Materials, University of Sheffield, S1 3JD, Sheffield, UK

    E. Henderson & J. E. Bailey

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  1. E. Henderson
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  2. J. E. Bailey
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Henderson, E., Bailey, J.E. The compositional and molecular character of the calcium silicate hydrates formed in the paste hydration of 3CaO·SiO2 . J Mater Sci 28, 3681–3691 (1993). https://doi.org/10.1007/BF01159854

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