The microstructure of pastes of ] part of C3S blended with 1·3 parts of precipitated silica, and 1 part of ordinary Portland cement (OPC) blended with 1·4 parts of silica fume, hydrated for two months at 25°C and three months at 40°C respectively, have been studied by analytical transmission electron microscopy and solid state NMR. The hardened pastes were found to consist, solely in the case of C3S/silica and principally in the case of OPC/silica fume, of silica particles embedded in CSH gel with a Ca/Si ratio significantly less than unity. The gel contained silicate units in chains of approximately 8·5 units in average length. Similar pastes prepared with alkali addition differed little in microstructure, but the OPC/silica fume paste with alkali addition contained isolated regions of low calcium and high alkali content with a distinctive morphology.
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October 1989
Research Article|
October 01 1989
The hydration of C3S and ordinary Portland cement with relatively large additions of microsilica
S. A. Rodger
University of Oxford
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*
Department of Materials, University of Oxford, Parks Road, Oxford OXI 3PH, UK.
†
Formerly at Department of Materials, University of Oxford, now at BP Research Centre, Sunbury on Thames, Middlesex PWI6 7LN. UK.
Publisher: Emerald Publishing
Online ISSN: 1751-7605
Print ISSN: 0951-7197
© 1989 Thomas Telford Ltd
1989
Advances in Cement Research (1989) 2 (8): 135–140.
Citation
Groves GW, Rodger SA (1989), "The hydration of C3S and ordinary Portland cement with relatively large additions of microsilica". Advances in Cement Research, Vol. 2 No. 8 pp. 135–140, doi: https://doi.org/10.1680/adcr.1989.2.8.135
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