A new class of organosilane-modified polycarboxylate superplasticizers with low sulfate sensitivity

Abstract : It is well-established that a competitive adsorption exists between polycarboxylate superplasticizers (SP) and sulfate ions solubilized in the interstitial solution of cement paste, which may cause a loss of the dispersing properties. This has been explained by competitive weak ionic interactions between functional carboxyl groups and sulfate ions with cement grains. In this study, SPs including trialkoxysilane functional groups have been synthesized. Adsorption and dispersing properties of these SPs were evaluated in the presence of different concentrations of Na(2)SO(4) added in aqueous solution. It appeared that a partial substitution of carboxyl groups by trialkoxysilane in the polymer makes them more resistant to sulfate ions. We suggested that the high adsorption capacity of these SPs results from the formation of strong bonds between hydroxysilane groups and calcium silicate hydrate phases. The improved compatibility of these new silylated SPs has been demonstrated through the formulation of two different concrete equivalent mortars.
Type de document :
Article dans une revue
Cement and Concrete Research, Elsevier, 2012, 42 (1), pp.166-172. 〈10.1016/j.cemconres.2011.09.006〉
Liste complète des métadonnées

http://hal.upmc.fr/hal-01576468
Contributeur : Bruno Publis_simm <>
Soumis le : jeudi 24 août 2017 - 13:09:56
Dernière modification le : jeudi 11 janvier 2018 - 06:23:18

Fichiers

Wei_Article_110615.pdf
Fichiers produits par l'(les) auteur(s)

Identifiants

Collections

Citation

Wei Fan, François Stoffelbach, Jutta Rieger, Laure Regnaud, Angélique Vichot, et al.. A new class of organosilane-modified polycarboxylate superplasticizers with low sulfate sensitivity. Cement and Concrete Research, Elsevier, 2012, 42 (1), pp.166-172. 〈10.1016/j.cemconres.2011.09.006〉. 〈hal-01576468〉

Partager

Métriques

Consultations de la notice

122

Téléchargements de fichiers

107