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137. Influence of recycled vegetable fibres on the fresh properties of pastes formulated from self compacting concrete



Title: 137. Influence of recycled vegetable fibres on the fresh properties of pastes formulated from self compacting concrete
Author(s): A. El Hilali, E. Ghorbel, P. Gonnon
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: 907 - 914
Total Pages: 8
Nb references: 8
Language: English


Abstract: This paper deals with the influence of vegetable fibres on the rheological properties of pastes used in the formulation of self compacting concrete. Empirical tests such as spread and Marsh cone tests are used to characterise the effect of short recycled fibres on the water and superplasticizer demand. Five types of fibres are investigated differing in their geometrical properties and in their content of cellulose. The paste is composed by cement and calcareous fillers (BETOCARB® P2). All formulations are made by imposing a water paste ratio by mass. The results show that the water powder ratio by volume is linearly related to the relative slump . By introducing vegetable fibres a saturation of the relative slump is noticed. The quantity of cellulose influences significantly the quantity of water required to fill the voids in the powders system while the geometrical parameters does not play a notable role compared to the cellulose content. However, the length of the fibres affects the superplasticizer demand. The determination of the SP dosage is independent of the testing procedure. Finally, it has been established that increasing the cellulose content and decreasing the fibre length provide a paste with the best fluidity and flow ability.


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