The use of rheology in the selection of concrete with low environmental impact

Author(s): Lars Nyholm Thrane, Thomas Svensson, Claus Pade and Oldrich Svec
Paper category: Proceedings of the International RILEM Conference Materials, Systems and Structures in Civil Engineering 2016 Segment on Fresh Concrete
Editor(s): Lars N. Thrane, Claus Pade, Oldrich Svec and Nicolas Roussel
ISBN: 978-2-35158-184-1
e-ISBN: 978-2-35158-185-8
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 176-185
Total Pages: 10
Language : English

Abstract: Within the framework of today’s prescriptive norms and material specifications, the use of environmental friendly binders results in concrete mix designs with significantly reduced water to binder ratios leading to increased viscosity and stickiness, which may be seen as a hindrance to a wide-spread industrial implementation of this green concrete technology. As part of an ongoing Danish research project, a performance based design approach was applied for selection of two concrete mixtures for a new road bridge. With the aim of finding alternative low environmental impact paste combinations a parameter study was performed at mortar level to assess the effect of the paste composition on rheological properties, compressive strength and chloride penetration resistance. This paper focuses on the rheological properties measured using a newly developed 4C-mini-Rheometer for paste and mortar samples. The results revealed a significant effect of the paste composition. A simple procedure was then applied to determine the paste composition at which the plastic viscosity of the mortar was equal to or lower than the target value defined by the plastic viscosity of the reference mortar. A similar procedure was applied for strength and durability properties. Two candidate paste compositions fulfilling all requirements were selected for the road bridge as alternatives to a reference paste composition.

Online publication : 2016
Publication type : full_text
Public price (Euros) : 0.00

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