Evaluation of Time Independent Rheological Models Applicable to Fresh Self-Compacting Concrete

By D. Feys, R. Verhoeven, G. de Schutter. 2007

139 citations recorded by the source corpus.

Abstract Self-Compacting Concrete is a new type of concrete which is more liquid compared to traditional concrete and which does not need any form of external compaction. As a result this type of concrete is suitable for a new placing technique: pumping SCC from the bottom in the formwork and letting it rise in the formwork due to the applied pressure. In order to understand the phenomena occurring during pumping operations, the rheological properties of SCC must be investigated and controlled. Tests have been performed with two different rheometers, which are described in this paper. For the Tattersall Mk-II rheometer, a calibration procedure has been worked out to eliminate secondary flows in the rheometer. Test results indicate that SCC is a thixotropic liquid, having a yield stress, showing shear thickening and having varying properties in time due to the occurring chemical reactions. In this paper, the time dependent effects will not be described. When trying to apply a rheological model to the obtained results, only the modified Bingham model seems appropriate. Applying the Bingham model results in the generation of negative yield stresses while the Herschel-Bulkley model has a parameter with a variable dimension and has a major mathematical restriction. The rheological properties of fresh SCC can be described with the modified Bingham model. A suitable parameter to describe shear thickening is defined as the ratio of the second order term in the shear rate of the modified Bingham model to the linear term (= c/m).

Subfields: Building and Construction, Civil and Structural Engineering, Fluid Flow and Transfer Processes

View Paper: https://www.semanticscholar.org/paper/7c42bf95b0109e406213ae6b4cd297ea9a77df85

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Citations in the corpus

Lubrication layer properties during concrete pumping (2013, methodology): “More information and details on the measuring and data transformation procedures for the Brookfield DV-II and ConTec Viscometer 5 can be found in [26–28].”
Fresh self compacting concrete, a shear thickening material (2008, methodology): “Mathematical analysis of the modified Bingham model indicates that the parameter c/μ is linked with the flow index n in Herschel–Bulkley, and as a result, this parameter describes shear thickening [13,21].”
Extension of the Reiner–Riwlin equation to determine modified Bingham parameters measured in coaxial cylinders rheometers (2013, background): “3) is not the best model to describe non-linear behaviour [21, 24, 25].”
Why is fresh self-compacting concrete shear thickening? (2009, methodology): “A discussion about the advantages or disadvantages of these two models has been given in [14] and [16], inwhich one of the arguments was to find the physical meaning of all terms in the equations.”