Changes in C3S hydration in the presence of cellulose ethers / J. Pourchez in Cement and concrete research, Vol. 40 N° 2 (02 ex.) (Fevrier 2010)  

Public ISBD [article]  inCement and concrete research > Vol. 40 N° 2 (02 ex.) (Fevrier 2010) . - pp. 179-188 Titre : Changes in C3S hydration in the presence of cellulose ethers Type de document : texte imprimé Auteurs : J. Pourchez, Auteur ; P. Grosseau, Auteur ; B. Ruot, Auteur Année de publication : 2010 Article en page(s) : pp. 179-188 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Cellulose ethers Hydration Adsorption Dissolution Nucleation Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : The influence of cellulose ethers (CE) on C3S hydration processes was examined in order to improve our knowledge of the retarding effect of cellulose ethers on the cement hydration kinetics. In this frame, the impacts of various cellulose ethers on C3S dissolution, C-S-H nucleation-growth process and portlandite precipitation were investigated. A weak influence of cellulose ethers on the dissolution kinetics of pure C3S phase was observed. In contrast, a significant decrease of the initial amount of C-S-H nuclei and a strong modification of the growth rate of C-S-H were noticed. A slowing down of the portlandite precipitation was also demonstrated in the case of both cement and C3S hydration. CE adsorption behavior clearly highlighted a chemical structure dependence as well as a cement phase dependence. Finally, we supported the conclusion that CE adsorption is doubtless responsible for the various retarding effect observed as a function of CE types. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TWG-4XK31Y3-2&_user=6 [...] [article] Changes in C3S hydration in the presence of cellulose ethers [texte imprimé] / J. Pourchez, Auteur ; P. Grosseau, Auteur ; B. Ruot, Auteur . - 2010 . - pp. 179-188. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 40 N° 2 (02 ex.) (Fevrier 2010) . - pp. 179-188 Mots-clés : Cellulose ethers Hydration Adsorption Dissolution Nucleation Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : The influence of cellulose ethers (CE) on C3S hydration processes was examined in order to improve our knowledge of the retarding effect of cellulose ethers on the cement hydration kinetics. In this frame, the impacts of various cellulose ethers on C3S dissolution, C-S-H nucleation-growth process and portlandite precipitation were investigated. A weak influence of cellulose ethers on the dissolution kinetics of pure C3S phase was observed. In contrast, a significant decrease of the initial amount of C-S-H nuclei and a strong modification of the growth rate of C-S-H were noticed. A slowing down of the portlandite precipitation was also demonstrated in the case of both cement and C3S hydration. CE adsorption behavior clearly highlighted a chemical structure dependence as well as a cement phase dependence. Finally, we supported the conclusion that CE adsorption is doubtless responsible for the various retarding effect observed as a function of CE types. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TWG-4XK31Y3-2&_user=6 [...]

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Current understanding of cellulose ethers impact on the hydration of C3A and C3A-sulphate systems / J. Pourchez in Cement and concrete research, Vol. 39 N° 8 (Août 2009)  

Public ISBD [article]  inCement and concrete research > Vol. 39 N° 8 (Août 2009) . - pp. 664–669 Titre : Current understanding of cellulose ethers impact on the hydration of C3A and C3A-sulphate systems Type de document : texte imprimé Auteurs : J. Pourchez, Auteur ; P. Grosseau, Auteur ; B. Ruot, Auteur Année de publication : 2009 Article en page(s) : pp. 664–669 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Cellulose ethers  Hydration  Adsorption  C3A  Calcium sulphate Résumé : The impact of cellulose ethers (CE) on C3A hydration was examined to support the understanding of the retarding effect of CE on cement hydration. In this sense, we successively studied the CE adsorption on ettringite and calcium hydroaluminates, and then the CE influence during C3A hydration in presence or absence of calcium sulphate. We emphasized a phase-specific adsorption of CE depending on CE chemistry. Besides, in addition of CE, we highlighted a gradual slowing down of C3A dissolution as well as ettringite and calcium hydroaluminates precipitation. Again, a great impact of CE chemistry and CE adsorption behaviour were noticed. Thus, HECs induce always a stronger adsorption on calcium hydroaluminates and a longer C3A hydration delays than HPMCs. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609001239 [article] Current understanding of cellulose ethers impact on the hydration of C3A and C3A-sulphate systems [texte imprimé] / J. Pourchez, Auteur ; P. Grosseau, Auteur ; B. Ruot, Auteur . - 2009 . - pp. 664–669. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 39 N° 8 (Août 2009) . - pp. 664–669 Mots-clés : Cellulose ethers  Hydration  Adsorption  C3A  Calcium sulphate Résumé : The impact of cellulose ethers (CE) on C3A hydration was examined to support the understanding of the retarding effect of CE on cement hydration. In this sense, we successively studied the CE adsorption on ettringite and calcium hydroaluminates, and then the CE influence during C3A hydration in presence or absence of calcium sulphate. We emphasized a phase-specific adsorption of CE depending on CE chemistry. Besides, in addition of CE, we highlighted a gradual slowing down of C3A dissolution as well as ettringite and calcium hydroaluminates precipitation. Again, a great impact of CE chemistry and CE adsorption behaviour were noticed. Thus, HECs induce always a stronger adsorption on calcium hydroaluminates and a longer C3A hydration delays than HPMCs. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609001239

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