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Internal vibration and viscous concrete: application and prediction of the radius of action

Author(s): G. Grampeix, N. Roussel, J. Dupoirier
Paper category: Conference
Book title: Rheology and processing of Construction Materials – 7th RILEM International Conference on Self-Compacting Concrete and 1st RILEM International Conference on Rheology and Processing of Construction Materials
Editor(s): Nicolas Roussel and Hela Bessaies-Bey
Print ISBN: 978-2-35158-137-7
e-ISBN: 978-2-35158-138-4
Publisher: RILEM Publications SARL
Pages: 123-130
Total Pages: 8
Language: English

The vibration applied to the fresh concrete has function to improve the filling of the formwork, to enable the bond strength between reinforcing steel bars and concrete and to increase the density of the material. However, many cases were reported recently where the applied vibration characteristics (frequency and amplitude) did not seem to be compatible with the casting of modern concretes with low Water/Cement ratio and strongly adjuvanted. In a first part, we empirically measure the radius of action of poker vibrators inside cementitious materials. Then, we validate a simple analytical model to predict the range of internal poker according to their mechanical properties and rheological properties of materials. These results validate the technological rules of engineers and show a maximum optimization of vibration with the equipment used in practice with viscous concretes. In aim to maintain the same performance, a technological modification seems necessary.

Online publication: 2013
Publication Type: full_text
Public price (Euros): 0.00

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