Abstract
On a étudié l'effet de la longueur des fibres sur les propriétés mécaniques et physiques des ciments renforcés de fibres de cellulose. L'augmentation de la longueur de la fibre renforçante améliore la résistance à la flexion, l'énergie de rupture statique, la résistance au choc et n'a pratiquement aucune influence sur le module de Young, par contre elle diminue la densité du matériau. Les résultats expérimentaux concernant le module de Young, la résistance à la flexion et la densité sont bien en accord avec les prédictions théoriques. L'examen des surfaces de rupture a montré que le mécanisme de rupture dépend aussi de la longueur des fibres incorporées; on passe du mécanisme de fibres déchaussées pour de petites longueurs de fibres au mécanisme de fibres fracturées quand la longueur des fibres devient plus importante.
Summary
Cellulose fibres are considered to be satisfactory substitutes for asbestos fibres in cement in view of their low cost and good mechanical properties. A previous study has shown that cements reinforced with bleached fibres (processed) present the best properties. Since the length of fibres can vary considerably from 1 to 3 mm in a range where the examination of fracture surfaces under bending shows that there can be a variety of mechanisms from a debonding of fibres to fracture of the fibres themselves, this report concentrates on describing the influence of the length of fibres on the mechanical and physical properties of cellulose fibre-cement composites. Increasing the length of reinforcing fibres improves the resistance to bending, static fracture energy and resistance to impact, whereas it has practically no influence on the Young's modulus. On the other hand, it decreases the specific gravity of the material. The results concerning the Young's modulus, resistance to bending and specific gravity obtained through experimentation correlate well with the theoretical predictions.
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Morlier, P., Khenfer, M.M. Effet de la longueur des fibres sur les propriétés mécaniques des ciments renforcés de fibres cellulosiques. Materials and Structures 24, 185–190 (1991). https://doi.org/10.1007/BF02472984
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DOI: https://doi.org/10.1007/BF02472984