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Effect of high volume fly ash on mechanical properties of fiber reinforced concrete

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Abstract

This paper reports the effects of incorporating high volume fly ash in fiber reinforced concrete. Fly ash was mixed as a partial fine aggregate replacement of approximately one third of the fines volume. The fibers were polypropylene or steel fibers at a maximum proportion of 1% by volume of the concrete. The results showed that fiber reinforced concrete that included high fly ash volume achieved compressive and tensile strength values that are more than double those of concrete without fly ash. Values of other mechanical properties have also achieved significant increase due to fly ash addition. It is suggested that a large quantity of fly ash is necessary to enhance the efficiency of fiber reinforcement. Polypropylene fibers resulted in gains up to 50% while steel fibers achieved gains up to more than 100%. This enhancement is believed to be due to the microstructural modification and densification in the transition zone between the matrix and the fibers.

Résumé

Cet article décrit les effets de la cendre volante quand elle est incorporée, en grande quantité, à du béton enrobé de fibres. D'une part, la cendre volante est mélangée au béton de manière à remplacer le contenu en granulat fin qui équivaut à environ un tiers du volume des matériaux fins. D'autre part, le béton est enrobé de fibres, à base de polypropylène ou d'acier, dans une proportion maximale de 1% par volume de béton. Les résultats obtenus démontrent que, mélangé à une quantité volumineuse de cendre volante, le béton enrobé à l'aide de fibres offre, entre autres propriétés mécaniques, une résistance à des efforts de compression et de traction qui dépasse nettement le double de celle que l'on obtient avec du béton dépourvu de cendre volante. On en déduit qu'une grande quantité de cendre volante s'avère nécessaire pour améliorer l'efficacité du renforcement à base de fibres. En outre, l'utilisation de fibres de polypropylène permet d'atteindre une efficacité jusqu' à 50%, tandis que cette dernière excède 100% avec des fibres d'acier. Ces améliorations sont attribuées à la modification et à la densification microstructurelles qui ont lieu dans la zone de transition entre la matrice de béton et les fibres utilisées.

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  1. School of Aerospace, Civil and Mechanical Engineering, University of New South Wales, Australian Defence Force Academy, Canberra, Australia

    O. Kayali

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Kayali, O. Effect of high volume fly ash on mechanical properties of fiber reinforced concrete. Mat. Struct. 37, 318–327 (2004). https://doi.org/10.1007/BF02481678

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  • DOI: https://doi.org/10.1007/BF02481678

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