21. Role of the granular lattice solid fraction in the stability of self-compacting concrete (SCC)

Title: 21. Role of the granular lattice solid fraction in the stability of self-compacting concrete (SCC)
Author(s): S. Bethmont, J.L. Tailhan, L. D’Aloia Schwartzentruber, P. Rossi
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: 149 - 154
Total Pages: 6
Nb references: 2
Language: English

Abstract: The stability study of an isolated aggregate, immersed in the cement paste of a SCC mix, often leads to the conclusion that this particle is not stable even though the concrete itself is stable. Hence, a new experimental device has been developed at the LCPC to study the interactions between coarse aggregates also called "granular lattice effects".
A new and exhaustive experimental study was carried out by using this new device. Its main objectives were first, to bring to the fore the group effects and second, to take them into account in the description of the segregation phenomenon trough the definition of a new stability criterion, inspired by the case of an isolated particle.
Experimental results enabled to underline the positive and dominating role of the solid fraction of the granular lattice. It does not depend on the nature of the cement paste or on the lattice layout. Besides, numerical simulations were done by using a finite element program CESAR-LCPC: rigid cylinders (case of 2D simulations) are immersed in the fluid represented by an analogous elasto-plastic medium associated to a Von Mises criterion. These simulations enabled the visualization of the lattice before the occurrence of shear flow.

Online publication: 2009-06-16
Publication type : full_text
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