Design and function of novel superplasticizers for more durable high performance concrete (superplast project) |
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Authors: | Yves F Houst Paul Bowen Annika Kauppi Pascal Borget Laurent Galmiche Jean-François Le Meins Françoise Lafuma Irene Schober David S Swift Bernt O Myrvold Kåre Reknes |
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Affiliation: | a ?cole polytechnique fédérale de Lausanne (EPFL), Laboratoire de technologie des poudres (LTP), 1015 Lausanne, Switzerland b Institute for Surface Chemistry, YKI AB, Box 5607, SE-114 86 Stockholm, Sweden c Physico-Chimie des Polymères et des Milieux Dispersés, umr 7615, ESPCI, 10 rue Vauquelin 75231 Paris cedex, France d Sika Technology, Tüffenwies 16, 8084 Zürich, Switzerland e Heriot-Watt University, School of the Built Environment, Edinburgh, EH14 4AS, UK f Borregaard LignoTech, P.O. Box 162, N-1701 Sarpsborg, Norway g Skanska Sverige AB, Råsundavågen 2, SE-169 83 Solna, Sweden h Université Catholique de Louvain, Unité de chimie des interfaces, Croix du Sud 2/18, B-1348 Louvain-La-Neuve, Belgium i École Normale Supérieure de Cachan, PPSM UMR 8531 CNRS, 61, Av. du Président Wilson, 95235 Cachan Cédex, France j Laboratoire de Chimie des Polymères Organiques (LCPO), UMR CNRS 5629-ENSCPB, 16 Avenue Pey Berland, 33607 PESSAC Cedex, France k Loughborough University, Freeform Construction Laboratory, Leicestershire, LE11 3TU, UK l Unicon, Norway |
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Abstract: | 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. |
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Keywords: | Dispersion (A) Rheology (A) Adsorption (C) Admixture (D) Superplasticizer |
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