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142. SCC mix design optimization for the casting of VHPC prebended composite beams



Title: 142. SCC mix design optimization for the casting of VHPC prebended composite beams
Author(s): S. Staquet, N. Roussel, L. D’Aloïa, R. Le Roy, F. Toutlemonde
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: 945 - 950
Total Pages: 6
Nb references: 9
Language: English


Abstract: An extensive experimental research has been carried out to extend the technique of prebended composite beams to VHPC. One-step was the casting of concrete around the bottom flange of two 13m-span steel girders. The thickness of the concrete situated below the bottom flange of the girder was only 55 mm. It was necessary to optimize a SCC. The concrete had to be as fluid as possible to ensure that it would fill the lowest part of the formwork under its own weight. It had to be a very stable mixture as the high strain rates generated by a flow in such a confined zone were able to separate the components of the concrete during casting. Our approach was to find the minimum fluidity that will guarantee the adequate filling of the formwork and assume that this minimum fluidity will ensure the maximum acceptable stability. Assuming that the concrete to be chosen will be stable, the numerical tools of non-Newtonian fluid mechanics have been used to simulate the casting phase. The results for two values of the rheological parameters and the value of the minimum fluidity needed to cast the beams are presented. The SCC mix design validation at the scale of the beam is detailed.


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


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