Effect of HMEC on the consolidation of cement pastes: Isothermal calorimetry versus oscillatory rheometry / A. M. Betioli in Cement and concrete research, Vol. 39 N° 5 (Mai 2009)  

Public ISBD [article]  inCement and concrete research > Vol. 39 N° 5 (Mai 2009) . - pp. 440–445 Titre : Effect of HMEC on the consolidation of cement pastes: Isothermal calorimetry versus oscillatory rheometry Type de document : texte imprimé Auteurs : A. M. Betioli, Auteur ; P.J.P. Gleize, Auteur ; D.A. Silva, Auteur Année de publication : 2009 Article en page(s) : pp. 440–445 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Oscillatory rheometry  Calorimetry  Cement paste  Cellulose ether Résumé : Chemical admixtures increase the rheological complexity of cement pastes owing to their chemical and physical interactions with particles, which affects cement hydration and agglomeration kinetics. Using oscillatory rheometry and isothermal calorimetry, this article shows that the cellulose ether HMEC (hydroxymethyl ethylcellulose), widely used as a viscosity modifying agent in self-compacting concretes and dry-set mortars, displayed a steric dispersant barrier effect during the first 2 h of hydration associated to a cement retarding nature, consequently reducing the setting speed. However, despite this stabilization effect, the polymer increased the cohesion strength when comparing cement particles with the same hydration degree. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S000888460900043X [article] Effect of HMEC on the consolidation of cement pastes: Isothermal calorimetry versus oscillatory rheometry [texte imprimé] / A. M. Betioli, Auteur ; P.J.P. Gleize, Auteur ; D.A. Silva, Auteur . - 2009 . - pp. 440–445. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 39 N° 5 (Mai 2009) . - pp. 440–445 Mots-clés : Oscillatory rheometry  Calorimetry  Cement paste  Cellulose ether Résumé : Chemical admixtures increase the rheological complexity of cement pastes owing to their chemical and physical interactions with particles, which affects cement hydration and agglomeration kinetics. Using oscillatory rheometry and isothermal calorimetry, this article shows that the cellulose ether HMEC (hydroxymethyl ethylcellulose), widely used as a viscosity modifying agent in self-compacting concretes and dry-set mortars, displayed a steric dispersant barrier effect during the first 2 h of hydration associated to a cement retarding nature, consequently reducing the setting speed. However, despite this stabilization effect, the polymer increased the cohesion strength when comparing cement particles with the same hydration degree. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S000888460900043X

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