Design and function of novel superplasticizers for more durable high performance concrete (superplast project)
BORGET, Pascal
Laboratoire de Physico-Chimie Macromoléculaire (UMR 7615) [LPCM]
Unité Chim Interfaces, U.C. Louvain
Laboratoire de Physico-Chimie Macromoléculaire (UMR 7615) [LPCM]
Unité Chim Interfaces, U.C. Louvain
GALMICHE, Laurent
Laboratoire de Physico-Chimie Macromoléculaire (UMR 7615) [LPCM]
Laboratoire de Photophysique et Photochimie Supramoléculaires et Macromoléculaires [PPSM]
Laboratoire de Physico-Chimie Macromoléculaire (UMR 7615) [LPCM]
Laboratoire de Photophysique et Photochimie Supramoléculaires et Macromoléculaires [PPSM]
LE MEINS, Jean-Francois
Laboratoire de Physico-Chimie Macromoléculaire (UMR 7615) [LPCM]
Laboratoire de Chimie des polymères organiques [LCPO]
Team 3 LCPO : Polymer Self-Assembly & Life Sciences
Laboratoire de Physico-Chimie Macromoléculaire (UMR 7615) [LPCM]
Laboratoire de Chimie des polymères organiques [LCPO]
Team 3 LCPO : Polymer Self-Assembly & Life Sciences
SWIFT, David S.
Heriot-Watt University [Edinburgh] [HWU]
Freeform Construction Laboratory [Loughborough]
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Heriot-Watt University [Edinburgh] [HWU]
Freeform Construction Laboratory [Loughborough]
Langue
en
Article de revue
Ce document a été publié dans
Cement and Concrete Research. 2008, vol. 38, n° 10, p. 1197-1209
Elsevier
Résumé en anglais
In this article we shall describe our quest and ultimate success in furthering our understanding of the action of superplasticizers on the rheology of cement and concrete. By specifically producing superplasticizers with ...Lire la suite >
In this article we shall describe our quest and ultimate success in furthering our understanding of the action of superplasticizers on the rheology of cement and concrete. By specifically producing superplasticizers with varied architectures, we have been able to show the important structural features of the macromolecules that lead to a successful superplasticizer or water reducing agent. Both polycarboxylate and lignosulfonate polymers have been investigated. Using both non-reactive model MgO powders, three different types of cement blends, the adsorption behaviour and the effect on the rheological properties of these two important superplasticizer families have been used to further develop a conceptual model for superplasticizer — cement behaviour. This paper will deal mainly with the conceptual model, the materials and methods used to asses the polymer adsorption behaviour and rheological properties of the systems studied. We shall briefly describe the adsorption of the polymers onto the different surfaces and their influence on surface charge and rheology and the influence of the various ionic species found in cement pore solutions that may influence polymer-cement affinity. The key factors are shown to be the effective adsorbed polymer thickness and the induced surface charge which can be influenced by the polymer architecture, the pore solution composition and the initial particle surface charge.< Réduire
Mots clés en anglais
Superplasticizer
Admixture (D)
Rheology (A)
Adsorption (C)
Dispersion (A)
Origine
Importé de halUnités de recherche