/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/10.1617/s11527-008-9439-x Materials and Structures, 42, 7, pp. 1003-1014, 2009 Formation and properties of C-S-H -PEG nano-structures Beaudoin, J. J.; Dramé, H.; Raki, L.; Alizadeh, R.http://irc.nrc-cnrc.gc.ca For m at ion a nd prope r t ie s of C-S-H -PEG na nost ruc t ure s NRCC-51315Beaudoin, J.J.; Dramé, H.; Raki, L.; Alizadeh, R. July 2009A version of this document is published in / Une version de ce document se trouve dans:Materials and Structures, 42, (7), pp. 1003-1014, DOI: 10.1617/s11527-008-9439-xThe 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. For more information visit http://laws.justice.gc.ca/en/showtdm/cs/C-42Les renseignements dans ce document sont protégés par la Loi sur le droit d'auteur, par les lois, les politiques et les règlements du Canada et des accords internationaux. Ces dispositions permettent d'identifier la source de l'information et, dans certains cas, d'interdire la copie de documents sans permission écrite. Pour obtenir de plus amples renseignements : http://lois.justice.gc.ca/fr/showtdm/cs/C-42 Formation and Properties of C-S-H -PEG Nano-Hybrids, Beaudoin et al. FORMATION AND PROPERTIES OF C-S-H -PEG NANO-STRUCTURESJames J. Beaudoin*, Harouna Dramé, Laila Raki and Rouhollah Alizadeh Institute for Research in Construction, National Research Council of Canada M-20, 1200 Montreal Road, Ottawa, Ontario K1A 0R6, Canada * E-mail: jim.beaudoin@nrc-cnrc.gc.ca, Tel: 613-993-6749; Fax: 613-954-5984 AbstractResults of an investigation of the intercalation potential of polyethylene glycol (PEG) with synthetic and pre-treated C-S-H are reported. The partial intercalation of PEG molecules in the interlayer of C-S-H is discussed. The effective and strong interaction of PEG molecules with the C-S-H surface was shown using XRD, 13 C CP and 29 Si MAS NMR, and DTGA. The position and character of the 002 low angle XRD peak of C-S-H are affected by drying procedures and concomitant chemical treatment preceding intercalation and the reaction temperature. Recovery of the initial 002 position after severe dryin...

A comparative study of the behavior of four types of smectite is reported: two with a low Fe content, SHCa-1 (hectorite from San Bernadino, California), SWy-1 (montmorillonite from Wyoming) and two nontronites NG-1 (from Hohen Hagen, Germany) and SWa-1 (Grant County, Washington). Cation exchange was performed with a freshly prepared 1 M Fe nitrate aqueous solution. Intercalation with the same solution partially neutralized with an anhydrous carbonate solution, giving a molar ratio of OH−/Fe = 2 was also studied. The modified clays were characterized by X-ray diffraction, N2 adsorption-desorption, Mossbauer spectroscopy, thermogravimetric analysis, atomic absorption spectroscopy, X-ray fluorescence and inductively coupled plasma analysis.In the cation exchange process, the goethite impurities grew with the Fe-rich clays but not with the Fe-poor clays. This exchange was also found to have no effect on the thermal stability and structure of the clay minerals with low Fe content, whereas it had a slight effect on the structure of the Fe-rich clays and on their thermal stability. The extent of the intercalation, however, appears to depend on the expandability of the clay layers to accommodate the Fe(III) polycations, and increases from the nontronites to montmorillonite and to hectorite. This intercalation treatment has only a slight effect on both the structure and the thermal stability of hectorite and montmorillonite. In contrast, the nontronites undergo a dramatic change in both their structure and thermal stability. The formation of Fe oxyhydroxide and oxide phases in both procedures becomes very important when the initial structural Fe content of the clay minerals is high, increasing from SHCa-1, SWy-1, SWa-1 to NG-1. The contribution of the structural Fe of the clays to the formation of the Fe oxyhydroxide is not negligible, because of partial leaching of Fe from the octahedral sheet of Fe-rich clays due to the low pH of the solutions.

No 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/10.1557/JMR.2008.0342 Research, 23, 10, pp. 2804Research, 23, 10, pp. -2815Research, 23, 10, pp. , 2008 Formation and characterization of calcium silicate hydratehexadecyltrimethylammonium nanostructure Beaudoin, J. J.; Dramé, H.; Raki, L.; Alizadeh, R. Journal of Materialshttp://irc.nrc-cnrc.gc.ca Formation and characterization of calcium silicate hydrate-hexadecyltrimethylammonium nanostructure NRCC-50845Beaudoin, J.J.; Drame, H.; Raki, L.; Alizadeh, R. 2008-10-20A version of this document is published in / Une version de ce document se trouve dans: Journal of Materials Research, v. 23, no. 10, 2008, .pp 1-12.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. For more information visit http://laws.justice.gc.ca/en/showtdm/cs/C-42Les renseignements dans ce document sont protégés par la Loi sur le droit d'auteur, par les lois, les politiques et les règlements du Canada et des accords internationaux. Ces dispositions permettent d'identifier la source de l'information et, dans certains cas, d'interdire la copie de documents sans permission écrite. Pour obtenir de plus amples renseignements : http://lois.justice.gc.ca/fr/showtdm/cs/C-42 Formation and Characterization of C-S-H -HDTMA Nano-Hybrids, Beaudoin et al. FORMATION AND CHARACTERIZATION OF CALCIUM SILICATE HYDRATE

/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.