Fibre-reinforced high-strength concrete

Sirje Vares, Tarja Häkkinen

    Research output: Book/ReportReport

    Abstract

    The publication comprises two experimental parts. In the first part, 14 different kinds of steel, polypropylene and polyacrylonitrile fibres are studied in order to make high-strength fibre-reinforced concrete. The effect of fibre type and volume on the load-deflection behaviour of FRC is studied and discussed. When the steel fibre volume fraction is low there is usually no significant increase in the "first crack" and flexural strengths, but the toughness of concrete can be significantly increased over that of plane matrix. Thin fibres with rather high specific surface area increase the most significantly the "first crack" strength of the composite. The effectiveness of increasing the fibre volume depends on the fibre type. Roughly speaking, the more effective the fibres are in terms of flexural strength, the more advantageous is the increase in fibre volume. On the other hand, the best fibres give the composite very good toughness already at low fibre contents. The fibre-spreading and slurry-infiltration method can be employed to make steel FRC with very high fibre content. The maximum obtainable fibre volume depends significantly on the stiffness and shape of the fibres. However, the mechanical properties of composites depend not only on the fibre volume content, but significantly on the properties of steel fibres. The relatively high specific surface area of the polymer fibres (PAN and PP) affects advantageously the "first crack" strength of the composite. The results indicate that the bending of PAN fibres to the high-strength matrix is too high in relation to their strength to provide the composite with good toughness. In the second part of the report the influence of aging on the load-deflection behaviour of different kinds of FRC is studied. Different matrices reinforced with steel or polypropylene fibre were subjected to aging and temperature and humidity changes. High-strength fibre-reinforced concrete composites, especially those reinforced by steel fibres can withstand large variation of temperature and humidity without the performance of fibres being significantly weakened.
    Original languageEnglish
    Place of PublicationEspoo
    PublisherVTT Technical Research Centre of Finland
    Number of pages104
    ISBN (Print)951-38-4398-X
    Publication statusPublished - 1993
    MoE publication typeNot Eligible

    Publication series

    SeriesVTT Publications
    Number160
    ISSN1235-0621

    Fingerprint

    Concretes
    Fibers
    Steel fibers
    Composite materials
    Toughness
    Cracks
    Specific surface area
    Bending strength
    Reinforced concrete
    Steel
    Polypropylenes
    Atmospheric humidity
    Aging of materials
    Polyacrylonitriles
    Infiltration
    Volume fraction
    Stiffness

    Keywords

    • fiber reinforcement
    • high strength concretes
    • composite materials
    • composite structures
    • experimentation
    • polypropylene fibers
    • polyarcylonitrile fibers
    • steel fibers
    • loads (forces)
    • deflection
    • flexural strength
    • mechanical properties
    • cracking (fracturing)
    • toughness
    • aging tests (materials)
    • durability

    Cite this

    Vares, S., & Häkkinen, T. (1993). Fibre-reinforced high-strength concrete. Espoo: VTT Technical Research Centre of Finland. VTT Publications, No. 160
    Vares, Sirje ; Häkkinen, Tarja. / Fibre-reinforced high-strength concrete. Espoo : VTT Technical Research Centre of Finland, 1993. 104 p. (VTT Publications; No. 160).
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    abstract = "The publication comprises two experimental parts. In the first part, 14 different kinds of steel, polypropylene and polyacrylonitrile fibres are studied in order to make high-strength fibre-reinforced concrete. The effect of fibre type and volume on the load-deflection behaviour of FRC is studied and discussed. When the steel fibre volume fraction is low there is usually no significant increase in the {"}first crack{"} and flexural strengths, but the toughness of concrete can be significantly increased over that of plane matrix. Thin fibres with rather high specific surface area increase the most significantly the {"}first crack{"} strength of the composite. The effectiveness of increasing the fibre volume depends on the fibre type. Roughly speaking, the more effective the fibres are in terms of flexural strength, the more advantageous is the increase in fibre volume. On the other hand, the best fibres give the composite very good toughness already at low fibre contents. The fibre-spreading and slurry-infiltration method can be employed to make steel FRC with very high fibre content. The maximum obtainable fibre volume depends significantly on the stiffness and shape of the fibres. However, the mechanical properties of composites depend not only on the fibre volume content, but significantly on the properties of steel fibres. The relatively high specific surface area of the polymer fibres (PAN and PP) affects advantageously the {"}first crack{"} strength of the composite. The results indicate that the bending of PAN fibres to the high-strength matrix is too high in relation to their strength to provide the composite with good toughness. In the second part of the report the influence of aging on the load-deflection behaviour of different kinds of FRC is studied. Different matrices reinforced with steel or polypropylene fibre were subjected to aging and temperature and humidity changes. High-strength fibre-reinforced concrete composites, especially those reinforced by steel fibres can withstand large variation of temperature and humidity without the performance of fibres being significantly weakened.",
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    author = "Sirje Vares and Tarja H{\"a}kkinen",
    note = "Project code: RAM0024051",
    year = "1993",
    language = "English",
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    Vares, S & Häkkinen, T 1993, Fibre-reinforced high-strength concrete. VTT Publications, no. 160, VTT Technical Research Centre of Finland, Espoo.

    Fibre-reinforced high-strength concrete. / Vares, Sirje; Häkkinen, Tarja.

    Espoo : VTT Technical Research Centre of Finland, 1993. 104 p. (VTT Publications; No. 160).

    Research output: Book/ReportReport

    TY - BOOK

    T1 - Fibre-reinforced high-strength concrete

    AU - Vares, Sirje

    AU - Häkkinen, Tarja

    N1 - Project code: RAM0024051

    PY - 1993

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    N2 - The publication comprises two experimental parts. In the first part, 14 different kinds of steel, polypropylene and polyacrylonitrile fibres are studied in order to make high-strength fibre-reinforced concrete. The effect of fibre type and volume on the load-deflection behaviour of FRC is studied and discussed. When the steel fibre volume fraction is low there is usually no significant increase in the "first crack" and flexural strengths, but the toughness of concrete can be significantly increased over that of plane matrix. Thin fibres with rather high specific surface area increase the most significantly the "first crack" strength of the composite. The effectiveness of increasing the fibre volume depends on the fibre type. Roughly speaking, the more effective the fibres are in terms of flexural strength, the more advantageous is the increase in fibre volume. On the other hand, the best fibres give the composite very good toughness already at low fibre contents. The fibre-spreading and slurry-infiltration method can be employed to make steel FRC with very high fibre content. The maximum obtainable fibre volume depends significantly on the stiffness and shape of the fibres. However, the mechanical properties of composites depend not only on the fibre volume content, but significantly on the properties of steel fibres. The relatively high specific surface area of the polymer fibres (PAN and PP) affects advantageously the "first crack" strength of the composite. The results indicate that the bending of PAN fibres to the high-strength matrix is too high in relation to their strength to provide the composite with good toughness. In the second part of the report the influence of aging on the load-deflection behaviour of different kinds of FRC is studied. Different matrices reinforced with steel or polypropylene fibre were subjected to aging and temperature and humidity changes. High-strength fibre-reinforced concrete composites, especially those reinforced by steel fibres can withstand large variation of temperature and humidity without the performance of fibres being significantly weakened.

    AB - The publication comprises two experimental parts. In the first part, 14 different kinds of steel, polypropylene and polyacrylonitrile fibres are studied in order to make high-strength fibre-reinforced concrete. The effect of fibre type and volume on the load-deflection behaviour of FRC is studied and discussed. When the steel fibre volume fraction is low there is usually no significant increase in the "first crack" and flexural strengths, but the toughness of concrete can be significantly increased over that of plane matrix. Thin fibres with rather high specific surface area increase the most significantly the "first crack" strength of the composite. The effectiveness of increasing the fibre volume depends on the fibre type. Roughly speaking, the more effective the fibres are in terms of flexural strength, the more advantageous is the increase in fibre volume. On the other hand, the best fibres give the composite very good toughness already at low fibre contents. The fibre-spreading and slurry-infiltration method can be employed to make steel FRC with very high fibre content. The maximum obtainable fibre volume depends significantly on the stiffness and shape of the fibres. However, the mechanical properties of composites depend not only on the fibre volume content, but significantly on the properties of steel fibres. The relatively high specific surface area of the polymer fibres (PAN and PP) affects advantageously the "first crack" strength of the composite. The results indicate that the bending of PAN fibres to the high-strength matrix is too high in relation to their strength to provide the composite with good toughness. In the second part of the report the influence of aging on the load-deflection behaviour of different kinds of FRC is studied. Different matrices reinforced with steel or polypropylene fibre were subjected to aging and temperature and humidity changes. High-strength fibre-reinforced concrete composites, especially those reinforced by steel fibres can withstand large variation of temperature and humidity without the performance of fibres being significantly weakened.

    KW - fiber reinforcement

    KW - high strength concretes

    KW - composite materials

    KW - composite structures

    KW - experimentation

    KW - polypropylene fibers

    KW - polyarcylonitrile fibers

    KW - steel fibers

    KW - loads (forces)

    KW - deflection

    KW - flexural strength

    KW - mechanical properties

    KW - cracking (fracturing)

    KW - toughness

    KW - aging tests (materials)

    KW - durability

    M3 - Report

    SN - 951-38-4398-X

    T3 - VTT Publications

    BT - Fibre-reinforced high-strength concrete

    PB - VTT Technical Research Centre of Finland

    CY - Espoo

    ER -

    Vares S, Häkkinen T. Fibre-reinforced high-strength concrete. Espoo: VTT Technical Research Centre of Finland, 1993. 104 p. (VTT Publications; No. 160).