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Design and evaluation of high-volume fly ash (HVFA) concrete mixes, report D : creep, shrinkage, and abrasion resistance of HVFA concrete.
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    Final report.
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  • Abstract:
    The main objective of this study was to determine the effect on shrinkage, creep,

    and abrasion resistance of high-volume fly ash (HVFA) concrete. The HVFA concrete

    test program consisted of comparing the shrinkage, creep, and abrasion performance of

    two concrete mix designs with 70% cement replacement with Class C fly ash relative to a

    Missouri Department of Transportation (MoDOT) standard mix design.

    Modified versions of standard test methods were used for the shrinkage and creep

    portions of the study. Shrinkage was measured through a modified version of ASTM

    C157 “Standard Test Method for Length Change of Hardened Hydraulic-Cement Mortar

    and Concrete,” while creep was measured through a modified version of ASTM C512

    “Standard Test Method for Creep of Concrete in Compression.” Abrasion resistance was

    measured in accordance with ASTM C944 “Standard Test Method for Abrasion

    Resistance of Concrete or Mortar Surfaces by Rotating-Cutter Method.”

    In addition to comparisons between the three mix designs, the results were also

    compared to existing prediction models and previous research results on HVFA concrete.

    Both HVFA concrete mixes showed a significant decrease in shrinkage strain relative to

    the control concrete, which was very consistent with previous research. With regard to

    creep, both HVFA concrete mixes also showed improved performance over the control

    mix, again confirming previous research results. However, the control concrete exhibited

    improved abrasion resistance relative to the two HVFA concrete mixes, which coincided

    with the higher strength of the control mix. At later ages, the abrasion resistance of the

    HVFA concrete improved due to late age strength gain characteristic of this material.

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