Journal
CEMENT AND CONCRETE RESEARCH
Volume 88, Issue -, Pages 170-183Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2016.04.006
Keywords
Cement paste; Calcium-silicate-hydrate (C-S-H); Hydration; Modeling; Phase volume fractions
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NMR relaxometry (Muller et al., 2012, 2013) quantifies the mass fractions of differently bound water in cement paste, as functions of hydration degree and water-to-cement ratio. We here reduce these findings to a single explanation: the density of C-S-H gel is solely governed by the specific precipitation space, across three hydration regimes: In regime I, solid C-S-H platelets (without gel porosity) precipitate on clinker surfaces. In regime II, C-S-H starts to include gel porosity. The forming gel densifies linearly with decreasing precipitation space. Thereby, regime III starts once the C-S-H gel has completely filled the capillary porosity. These findings allow for developing an analytical hydration model. It provides expressions for C-S-H gel densification and for the evolution of the volume fractions of clinker, of solid hydrates, as well as of the gel and capillary porosities, as functions of the water-to-cement ratio and the hydration degree; consistently representing published experimental data. (C) 2016 Elsevier Ltd. All rights reserved.
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