45. Effect of pigments on the rheological properties of mortars for self-compacting concrete

Title: 45. Effect of pigments on the rheological properties of mortars for self-compacting concrete
Author(s): A. López, J.M. Tobes, M.C. Torrijos, B.E. Barragán, G. Giaccio, R. Zerbino
Paper category : conference
Book title: 5th International RILEM Symposium on Self-Compacting Concrete
Editor(s): G. De Schutter and V. Boel
Print-ISBN: 978-2-35158-047-9
e-ISBN: 978-2-35158-088-2
Publisher: RILEM Publications SARL
Publication year: 2007
Pages: 309 - 314
Total Pages: 6
Nb references: 6
Language: English

Abstract: The development of self-compacting concrete appears as a promising alternative for new applications of coloured concrete. This paper presents studies on mortars performed with the aim of analyzing the effects of pigments on the fluidity and filling ability of cement pastes and mortars, respectively. Grey and white portland cements, calcareous filler and polycarboxylic ether based superplasticizers were used. Three iron oxide pigments, colour yellow, red and black, were employed in different doses, as a replacement of calcareous filler by volume. Mini-slump and Marsh cone tests were performed on cement pastes to obtain the saturation dosage of the superplasticizer. At mortar level, engineering test such as slump flow and V-Funnel were carried out, and fundamental rheological parameters measured by means of a BML viscometer. It has been observed that the type and proportion of pigment modifies the rheological behaviour, especially the cohesion, and varies the demand of superplasticizer.
The changes in flowability also depend on the type and amount of pigment incorporated as well as on the cement used, with greater losses along time for the case of white cement.

Online publication: 2009-06-16
Publication type : full_text
Public price (Euros): 0.00