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Propriétés mécaniques de composites ciment-fibres organiques

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Résumé

Les performances mécaniques de composites à matrice cimentaire renforcée par différentes fibres courtes organiques sont analysées à partir de l'évolution de l'indice de ténacité pour deux pourcentages de renfort: le premier, variable, correspond à la fabrication d'un composite isocoût d'un composite ciment-fibres de verre mis en oeuvre par coulage-vibration; le second est fixe: 6% en poids de la matrice. Dans le premier cas, le comportement des composites est en général fragile; il devient ‘élastique-plastique’ avec les fibres de polypropylène et de polyvinylalcool. Dans le second cas, on obtient majoritairement des matériaux ‘écrouissables’ sauf avec les fibres de carbone et de polyaramide.

Summary

Six short organic fibres (polyamide, polyacrylonitrile, polypropylene, poly(vinyl alcohol), polyaramide and carbon) were used to reinforce cement based matrices. Two contents of reinforcement were investigated: one, variable in the range 0.35–1.40%, corresponding to a composite presenting the same cost as a glass fibre reinforced composite containing 2.5% glass fibres; and a second with a 6% content. Three-point flexure tests were performed and the indices of toughness were computed. The results indicate that the behaviour of the composites is brittle when the fibre content is low, except when polypropylene and poly(vinyl alcohol) fibres are used, or ductile for higher fibre contents, except when carbon and polyaramide fibres are used.

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Authors and Affiliations

  1. Laboratoire des Matériaux Minéraux, INSA de Lyon, 20, Avenue Albert Einstein, 69621, Villeurbanne Cedex, France

    V. Houget, J. Ambroise & J. Pera

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  1. V. Houget
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  2. J. Ambroise
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  3. J. Pera
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Houget, V., Ambroise, J. & Pera, J. Propriétés mécaniques de composites ciment-fibres organiques. Materials and Structures 28, 220–229 (1995). https://doi.org/10.1007/BF02473252

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