Durability of cracked fibre reinforced concrete exposed to freeze-thaw and deicing salt

Ernst Jan De Place Hansen

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    Durability studies are carried out by subjecting FRC-beams to combined mechanical and environmental load. Mechanical load is obtained by subjecting beams to 4-point bending until a predefined crack width is reached. Specimens sawn from the beams after unloading are exposed to freeze-thaw and deicing salt. The concrete has a water-powder ratio of 0.38 including both fly ash and silica fume. Both steel fibres (ZP, 0.4 vol%) and polypropylene fibres (PP, 1 vol%) are used as well as main reinforcement. The freeze-thaw test emphasizes the need for a critical evaluation of the mix design and mixing methods when designing FRC-structures. The scaling is increased by a factor 5 to 10 when adding fibres to the concrete while the air content is below 4% by volume. The variation of the scaling increases when adding fibres. Capillary water uptake in uncracked specimens of FRC was 20-30% higher at 1°C than at 20°C for both ZP- and PP-fibres, while the temperature had no effect on the water uptake in plain concrete.(This abstract is a short version of the published abstract)
    Original languageEnglish
    Title of host publicationConstruction and Environment. CIB World Building Congress 1998, Gävle, Sweden, 7-12 June
    Place of PublicationRotterdam
    PublisherInt. Council for Building Research Studies and Documentation CIB
    Publication date1998
    Publication statusPublished - 1998
    EventCIB World Building Congress 1998 - Gävle, Sweden
    Duration: 1 Jan 1998 → …


    ConferenceCIB World Building Congress 1998
    CityGävle, Sweden
    Period01/01/1998 → …

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