20. A step towards the design of stable self compacting concrete

Title: 20. A step towards the design of stable self compacting concrete
Author(s): L. D’Aloia Schwartzentruber, S. Bethmont, L. Ladouceur, 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: 143 - 148
Total Pages: 6
Nb references: 6
Language: English

Abstract: A recent study has enabled to take into account interactions between coarse aggregates in the description of the segregation phenomenon. The results exhibited the dominating role of the lattice solid fraction and that of the shear yield stress of the suspending phase, through the definition of a new stability criterion.
An attempt to apply these new results to the design of stable SCC is presented here. It is also based on the definition of the suspending phase inspired by the French MBE ("mortier de béton équivalent" also called "concrete equivalent mortar"). The main principle at the basis of MBE design is applied to the design of finer mortars characterized by a smaller maximum particle size: 315µm, 1mm and 2mm. These fine mortars are referred to as MME ("Mortiers de MBE equivalent"). It has been shown that the rheological behaviour of MME(s) is well correlated to that of the concrete itself. An experimental study was carried out on several SCC mixtures. The rheological behaviour of their MME(s) was characterized and the stability of SCC was estimated by the sieve test. The application of the new stability criterion has displayed that the MME whose maximum particle size is 1 millimetre, could be taken as the suspending phase of SCC. Hence, stable SCC should be design through an experimental approach based on the easier design of a fine mortar.

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