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Concrete reinforcement by steel fibers, a synthetic or hybrid fiber is usual. However, for self compac ting concrete (SSC) the fiber-reinforcement can decrease the workability. This is particularly true for pol ypropylene or vegetable fibers for which a significant loss of workability is expected due to the roughness of th eir surface. Such a surface state has contradictory effects on t he material properties: on one hand, it reduces the flow of fresh concrete and on the other hand, it improves the bon d between the fibers and the hardened cement matrix . In this paper, two types of fibers were used: natural fiber s (Diss fibers) and polypropylene fibers. The contr ibution focuses on studying the effects of these fibers on both the fresh hard SCC properties and hardened one s (flexural, compression test and restrained shrinkage). Results how a decrease of the fresh SSC characteristics i ncluding the flow and an increase of the flexural strength o f the hardened SSC reinforced by fibers vegetable f i ers also delay cracking of concrete.

synthèse

Caractérisation d’un Béton Autoplaçant avec Addition de Laitier Cristallisé et Renforcé par des Fibres de Polypropylène et de Diss = Characterization of a Self-Compacting Concrete with Addition of Crystallized Slag and Reinforced with Polypropylene and Diss Fibers