Particle Distance Model to Describe the Rheological Behaviour of Self-Compacting Mortars Containing High Amounts of Additions

Title: Particle Distance Model to Describe the Rheological Behaviour of Self-Compacting Mortars Containing High Amounts of Additions
Author(s): S. Uebachs, W. Brameshuber
Paper category : conference
Book title: International RILEM Conference on Material Science
Editor(s): W. Brameshuber
Print-ISBN: 978-2-35158-110-0
e-ISBN: 978-2-35158-111-7
Publisher: RILEM Publications SARL
Publication year: 2010
Pages: 367 - 376
Total Pages: 10
Nb references: 11
Language: English

Abstract: Small variations in the water content of a concrete mix or in the water demand of the raw materials exert a decisive influence on the rheological properties of Self-Compacting Concrete (SCC). This effect is increased by the comparatively high amount of additions and the total binder content in these concretes, respectively. To analyse the effect of the water content on the rheological properties, a particle distance model was developed. It describes the relative viscosity as well as the gradient of the flow curve (linear, shear thickening or shear thinning behaviour) depending on the distance between the particles in the mix. Thus, the qualitative prediction of the rheological behaviour of an SCC is possible. For the rheological characterisation, self-compacting mortars were investigated with a rotational viscometer. The parameters investigated were the granulometry of the powder as well as the influence of the total water content of the mortars. For these examinations, ordinary Portland cements with different finenesses were applied. During the investigation programme mostly fly ashes were used as addition. They differ concerning their fineness and grain shape (dry or wet bottom furnace). One fly ash of each type was fractionated in defined grain size classes.

Online publication: 2010-12-02
Publication type : full_text
Public price (Euros): 0.00