34. On-line mixing end-point detection for SCC by power consumption measurement

Title: 34. On-line mixing end-point detection for SCC by power consumption measurement
Author(s): B. Cazacliu, E. Brunquet
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: 239 - 244
Total Pages: 6
Nb references: 10
Language: English

Abstract: The evolution of concrete characteristics with the mixing time is related by empirical relations to the mixing power time evolution when a threshold mixing time is exceeded. This threshold mixing time corresponds to the transition of the material into the mixer from a granular cohesive material to a granular paste. The corresponding point in the mixing power to mixing time chart - the fluidity point - is associated to a sharp decrease in the power rate.
Several on-line detection methods of the fluidity point are presented at the time of an experimental campaign. It consists on sixty batches of different composition produced in a laboratory scale 1 concrete mixing plant. The analyses focuses on the twelve SCC produced.
The other batches, mainly of HPC, confirm the observed evolutions.
For a given industrial situation (mixer, loading sequences) the fluidity points for different batches are situated on a master curve. Once the fluidity point determined, the following evolution of the mixing power with time can be predicted for a given batch. This prediction may improve the choice of the mixing end-point, batch per batch.

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