A comparative study of the volume stability of C–S–H (I) and Portland cement paste in aqueous salt solutions

Abstract

/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1007/s10853-006-1328-5 Science, 42, 16, pp. 6837-6846, 2007-08-01 A Comparative study of the volume stability of C-S-H (I) and Portland cement paste in aqueous salt solutions Dramé, H.; Beaudoin, J. J.; Raki, L. Journal of Materialshttp://irc.nrc-cnrc.gc.ca A Comparative study of the volume stability of C-S-H(I) and Portland cement paste in aqueous salt solutions NRCC-45612Dramé, H.; Beaudoin, J.J.; Raki, L.A version of this document is published in / Une version de ce document se trouve dans: Journal of Materials Science, v. 42, no. 16, August 2007, pp. 6837-6846 Doi: 10.1007/s10853-006-1328 The material in this document is covered by the provisions of the Copyright Act, by Canadian laws, policies, regulations and international agreements. Such provisions serve to identify the information source and, in specific instances, to prohibit reproduction of materials without written permission. Similarities were observed between the length change behavior of compacted C-S-H (I) and the swelling of smectite clays in contact with these osmotic media. The similarities are compatible with explanations of expansion provided by both the osmotic and the electrical double layer (EDL) theories. The relationship between the expansive behavior of C-S-H and both Na and Ca Montmorillonite in contact with aqueous salt solutions is discussed extensively in the context of its significance in cement science.

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

“…the position on the water isotherm is relevant to durability concerns. This has been observed previously [41]. The relatively larger hysteresis, seen in Figure 2(a), for the cement paste sample may suggest that it is more difficult for water molecules to re-enter interlayer regions of the C-S-H compared to Ca-montmorillonite and 1.4 nm tobermorite.…”

Effects of sodium/calcium cation exchange on the mechanical properties of calcium silicate hydrate (C-S-H)

“…0.25% expansion for different Ca/Si C-S-Hlayer in the presence of sodium cations[25]. Furthermore, the greater volume of C(Na)-S-H was consistent with the observed swelling of hydrated cement and C-S-H in the presence of sodium chloride[46] and provided further insights into the mechanisms of swelling in the presence of sodium. The expansion of the C-S-Hlayer caused by the incorporation of Na + was thought to be, in turn, observable at the macroscale and, thus, intrinsic to the swelling of hydrated cement in the presence of sodium.…”

C–S–H/polyaniline nanocomposites prepared by in situ polymerization

“…Two compositionally different C-S-H materials were studied having C/S molar ratios of 0.8 and 1.2. These representative stoichiometries were selected based on the chemical and physical differences observed for two categories of C-S-H obtained above and below a C/S ratio of about 1.1 [20][21][22]. The CaO was freshly calcined from the reagent grade calcium carbonate (Sigma-Aldrich) at 900°C.…”