Adsorbing polymers and macroscopic viscosity of concentrated cement pastes

Author(s): J. Hot, N. Roussel
Paper category: Conference
Book title: Rheology and processing of Construction Materials – 7th RILEM International Conference on Self-Compacting Concrete and 1st RILEM International Conference on Rheology and Processing of Construction Materials
Editor(s): Nicolas Roussel and Hela Bessaies-Bey
Print ISBN: 978-2-35158-137-7
e-ISBN: 978-2-35158-138-4
Publisher: RILEM Publications SARL
Pages: 197-204
Total Pages: 8
Language: English

Abstract: 
Low water to cement ratio concretes are becoming more common in either the field of high strength concretes or low environmental impacts concretes. Although it is industrially feasible to reduce the yield stress of these materials in order to obtain some self-compacting properties by adding adequate amounts of super-plasticizers (SP) in the system, the viscosity of these concretes stays extremely high and may affect the casting processes. Recently, in industrial practice, some polymers were identified as having a viscosity reducing effect for a given slump flow value.

The work presented here aims at identifying some potential physical mechanisms at the origin of this decrease in viscosity. We focus here on the measurement of the part of viscosity that is not due to colloidal interactions. Our results show indeed that SP affect the residual viscosity, i.e. the apparent viscosity without yield stress contribution, of cement pastes.

Online publication: 2013
Publication Type: full_text
Public price (Euros): 0.00