Zhang, Z;
Wang, Q;
Zhang, M;
Huang, Z;
Zhuang, S;
(2020)
A new understanding of the effect of filler minerals on the precipitation of synthetic C–S–H.
Journal of Materials Science
, 55
pp. 16455-16469.
10.1007/s10853-020-05185-2.
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Abstract
The filler effect is the most important physical mechanism of mineral admixtures in the early hydration of cement whose chemical properties greatly affect the precipitation of C–S–H. In this study, calcite, strontianite, magnesite, dolomite, quartz, whewellite and whitlockite were selected as the fillers. The morphology and reaction kinetics of synthetic C–S–H precipitated on the surfaces of different fillers were studied via electron microscopy observations and electrical conductivity and ion concentration measurements. The precipitation rate of C–S–H has a positive correlation with the affinity of Ca2+ for adsorption on the fillers, which can be explained by the nucleation barrier of C–S–H. Extremely ordered honeycomb-like morphology of the C–S–H is found on calcite and strontianite surfaces, while less regular leaf-like or honeycomb-like C–S–H is found on whewellite and whitlockite. The ordered C–S–H pattern is related to the lattice cleavage of the ionic compound filler. In the case of quartz, C–S–H prefers growth along the tangential direction, which is quite different from the normal-direction growth on ionic compounds. The in-plane growth of C–S–H on quartz is believed to be induced by a layer of loosely physically adsorbed Ca2+.
| Type: | Article |
|---|---|
| Title: | A new understanding of the effect of filler minerals on the precipitation of synthetic C–S–H |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1007/s10853-020-05185-2 |
| Publisher version: | https://doi.org/10.1007/s10853-020-05185-2 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | filler; synthetic C-S-H; morphology; microstructure; kinetics |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10113581 |
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