New poly-phosphonic superplasticizers particularly suited for the manufacture of high performance SCC

Author(s): M. Bellotto, L. Zevnik
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: 269-276
Total Pages: 8
Language: English

The design of Self-compacting concrete (SCC) is essentially an empirical procedure, and the resulting concrete is sensitive to minor variations of the constituents. Moreover, especially for high performance SCC concretes with low water-to cement (w/c) ratio, the consistency is often “sticky”, i.e. concrete retains a relatively high viscosity at shear rates in the range of mild stirring, while having a low yield stress to flow under gravity. In this work we present a novel poly-phosphonic superplasticizer (Ph) which, while achieving a high water reduction, reduces the high-shear viscosity of SCC thus reducing its “stickiness”. Also the robustness of SCC is improved and its sensitivity to small variations of w/c is reduced. We hypothesize a mechanism to explain this behavior, based on rheological measurements on the concrete mortar and paste.

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