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Internally cured concrete for pavement and bridge deck applications.
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Internally cured concrete for pavement and bridge deck applications.
  • Publication/ Report Number:
    BDV31-977-11 ; U.F. Project No: 00110686 ;
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  • Abstract:
    A laboratory and field testing program was conducted to evaluate the performance and usability of internally

    cured concrete (ICC) using lightweight aggregates for bridge decks and concrete pavement slabs under Florida

    conditions. The laboratory testing program evaluated three standard mixes (SM) and three corresponding ICC mixes

    with the same water-cementitious (w/c) ratios and cementitious materials contents. The ICC mixes were produced

    by replacing a part of the fine aggregate with a pre-wetted lightweight aggregate (LWA). The quantity of LWA used

    was an amount that would supply 7 lb of absorbed water per 100 lb of cementitious materials used. The amounts of

    water-reducing admixtures needed for the ICC mixes to achieve the same workability of the fresh concrete were less

    than those for the standard mixes with the same w/c ratios. The compressive strength, flexural strength, elastic

    modulus, splitting tensile strength, and coefficient of thermal expansion of the ICC mixes were lower than those of

    the standard mixes with the same w/c ratio. The ICC mixes showed substantially greater resistance to shrinkage

    cracking than the standard mixes as observed from the results of the restrained shrinkage ring test.

    Two ICC test slabs and one SM test slab were constructed to evaluate the performance of ICC in pavement

    slabs. The results of the critical stress analysis showed that at a critical loading condition, the computed stress-to-

    strength ratios for the ICC slabs were lower than that for the SM slab. Visual inspection of the SM slab after heavy

    vehicle simulator (HVS) loading showed that some hairline cracks could be seen next to the wheel path. These

    hairline cracks could be caused when micro shrinkage cracks developed into hairline cracks after the slab was loaded

    repetitively by the HVS wheel load. No visible cracks were observed from the two ICC test slabs.

    Based on the results of the critical stress analysis and the visual inspection of the three test slabs, the ICC test

    slabs appeared to have better performance than the standard-mix slab. A field testing program to further assess the

    performance and benefits of ICC mixes in bridge deck and pavement applications is recommended

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