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Influence of surfactants on cement hydration at the concrete / formwork interface

Title: Influence of surfactants on cement hydration at the concrete / formwork interface
Author(s): E. Gueit, E. Darque-Ceretti, P. Tintillier, M. Horgnies
Paper category : conference
Book title: International RILEM Conference on Use of Superabsorbent Polymers and Other New Additives in Concrete
Editor(s): O.M. Jensen, M.T. Hasholt and S. Laustsen
Print-ISBN: 978-2-35158-104-9
e-ISBN: 978-2-35158-105-6
Publisher: RILEM Publications SARL
Publication year: 2010
Pages: 105 - 115
Total Pages: 11
Nb references: 8
Language: English

Abstract: The microstructure of the main cement hydrates in the first microns of the concrete surface affects the surface properties such as open porosity, hardness, staining, aesthetic, etc. In particular, variations in the amount and shape of calcium hydroxide crystals can induce attractive surface properties. Yet, the parameters and mechanisms that govern CH growth in concrete remain not fully understood. This study focuses on the use of aqueous solutions (made of water and non-ionic surfactant) at the concrete/formwork interface. In some cases, the presence of the surfactant promotes CH nucleation and growth at the concrete surface. Image analysis is used to quantify the amount of CH and shows that CH nucleation is promoted preferentially by hydrophobic surfactants. SEM observations reveal that the surfactant-induced crystals exhibit a specific layered structure made of large thin leaves. Finally, calorimetry measurements show that the surfactants do not modify the cement hydration kinetics.

Online publication: 2010-10-04
Publication type : full_text
Public price (Euros): 0.00

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