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23. Effect of sand particle size distribution on fluidity and passing ability of highly flowable mortars



Title: 23. Effect of sand particle size distribution on fluidity and passing ability of highly flowable mortars
Author(s): J.M. Tobes, A. López, G. Giaccio, B.E. Barragán, R. Zerbino
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: 163 - 168
Total Pages: 6
Nb references: 5
Language: English


Abstract: Self-compacting concrete (SCC) is designed attending to achieve sufficient filling ability only under the action of its own weight, without compaction, and presenting no segregation. It has been recognized that the amount of powder material should be capable of filling the voids of the granular skeleton and reducing the interparticle friction, so fluidity can be achieved and blocking minimized. In this sense, the finer particles of the sand should affect properties of fresh mortar and the optimum paste volume in SCC design. This paper analyzes the effect of sand particle size distribution on the fluidity of self-compacting mortars. Three natural sands with 21, 29 and 38% of particles smaller than 0.3 mm, cement with calcareous filler, and calcareous filler added separately, were used. Slump-flow and V-Funnel tests were carried out on mortars varying the paste content between 52 and 63%, and the adjusting the dosage of superplasticizer accordingly. The evolution of fluidity with time was also analyzed. As a result, it was observed that the influence of the finer particles of the sand is more significant when the fluidity of the mortar increases. For a same slump flow, the passing time through the V-funnel increases when the fineness of the sand increases.


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


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