Dimensional change and elastic behaviour of layered silicates and Portland cement paste

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DOIResolve DOI: http://doi.org/10.1016/j.cemconcomp.2009.09.004
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TypeArticle
Journal titleCement and Concrete Composites
Volume31
Issue9
Pages34
SubjectDimensional change, modulus of elasticity, Portland cement paste, ca-montmorillonite, tobermorite, nanostructure, durability, calcium silicate hydrate; Cement/Concrete
AbstractThe role of water in hydrated Portland cement paste (hpc) is germane to understanding the nature of nanostructure ? property relationships of the material. The irreversible dimensional changes of hpc and phase pure C-S-H that occur on wetting and drying are dissimilar to those observed for other silicate minerals of interest to cement science. This irreversibility in hpc is also observed for the modulus of elasticity parameter. Length change, mass change and modulus of elasticity isotherms (including drying-wetting cycles) were determined for specimens of hpc, Ca-montmorillonite and 1.4 nm tobermorite. Length change and modulus of elasticity versus mass loss curves were also obtained for phase pure C-S-H (C/S= 0.8,1.0 and 1.5). All the isotherms exhibit significant irreversible behaviour. Similarities and differences in the nature and character of the isotherms and the relevance of the C-S-H data are discussed. Inferences are made with respect to the nanostructural nature of hpc, its dimensional response in aqueous media and the correspondence in behaviour of synthetic C-S-H and that formed in hpc. It is apparent that hpc has unique characteristics that are responsible for stability.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number51183
20120
NPARC number20373951
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Record identifier52e7ac8a-3315-47c5-9775-3d54aab3078d
Record created2012-07-23
Record modified2016-05-09
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