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Concrete deck material properties.
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  • Abstract:
    The two-fold focus of this study was (a) to develop an understanding of the mechanisms responsible for causing

    cracking in the concrete; and (b) to study the influence of the local materials on the performance of NYSDOT’s HP

    concrete mixture. Recommendations for minimizing the premature cracking in HP concrete decks related to restrained

    volumetric contraction are developed from the results of this investigation. It is important to reduce the total

    temperature rise and the temperature gradient across the steel girder to minimize the level of tensile stress in concrete

    in the first few days after casting, while the concrete goes through the heating and cooling produced by hydration heat.

    The local materials for use in HP concrete should be carefully evaluated. The type of coarse aggregate used in the

    mixture produces significant differences in the strength and elastic modulus of concrete. Differences in cementitious

    material contribute to significant differences in autogenous and drying shrinkage. Recommendations pertaining to

    cementitious materials are: (a) If silica fume is used, it should only to be added separately to the mix, unless the

    reactivity of blended silica fume is established and found comparable to silica fume addition; (b)Only the use of Type

    I/II or Type II cement should be permitted; and (c) When ground granulated blast furnace slag is used, it should be

    evaluated to ensure that it does not provide high early reactivity.

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