47. Development of a concrete rheometer fitted with hydraulic pressure transducers

Title: 47. Development of a concrete rheometer fitted with hydraulic pressure transducers
Author(s): S. Amziane, T. Lecompte, J.C. Tchamba, Ch. Lanos
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: 323 - 328
Total Pages: 6
Nb references: 8
Language: English

Abstract: This study presents original results about the rheological measurement of concrete mixes including SCC and focuses on the evaluation of their mechanical and physical behavior under shearing stress. A vane rheometer was developed to characterize fresh cement based material. In addition to classical concrete rheometer, two special hydraulic pressure transducers were fitted to the container to monitor the pore water pressure variation while shearing the material.
Experiments on an SCC mixture allow a new approach of understanding the SCC behaviour at fresh state. More precisely, the aim of the pressure measurement was to show the importance of the water pressure variation of concrete while shearing. The test data showed the volume variations of the material. Moreover, there is a correlation between the evolution of hydraulic pressure and the torque applied on the vane. Actually, the pore water pressure variation inside the multi phase fluid mixes during shearing seems to influence greatly their shear resistance. Further more, a recent lateral pressure concrete model has shown the correlation between the magnitude of lateral pressure and yield stress variation. This is the consequence of thixotropy on the evolution of the lateral stress during and after casting.

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