Oriented aggregation of calcium silicate hydrate platelets by the use of comb-like copolymers

Luc Nicoleau, Torben Gädt, Livia Chitu, Günther Maier, Oskar Paris

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78 Scopus citations

Abstract

We present an in-depth study of the formation of stable suspensions of low density aggregates of calcium silicate hydrate (C-S-H) particles stabilized by comb-like copolymers. These suspensions exhibit fundamentally interesting properties such as gel formation at 1.4 vol% of particles. Furthermore, they constitute a novel class of hardening accelerators for cementitious systems. Stabilization of C-S-H particles by polyelectrolytes is essential for the synthesis of stable and active C-S-H suspensions. Comb-polymers consisting of charged monomers (acrylic acid or 2-(phosphonooxy)-ethyl-methacrylate) and poly(ethylene glycol) monomers direct C-S-H particle aggregation into fractal structures. The fractal nature of the aggregates has been characterized by TEM and SAXS. Based upon (U)SAXS data of different C-S-H suspensions, it is demonstrated that two-dimensional initial C-S-H particle aggregation favours the creation of structures with a high specific surface area which are particularly active as cement hardening accelerators.

Original languageEnglish
Pages (from-to)4864-4874
Number of pages11
JournalSoft Matter
Volume9
Issue number19
DOIs
StatePublished - 2013
Externally publishedYes

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