Decing Salt-Scaling Resistance: Laboratory and Field Evaluation of Concrete Containing up to 70 % Class C and Class F Fly Ash

    Volume 2, Issue 7 (July 2005)

    ISSN: 1546-962X

    CODEN: JAIOAD

    Published Online: 8 June 2005

    Page Count: 12


    Naik, TR
    Director, UWM Center for By-Products Utilization, Milwaukee, WI

    Kraus, RN
    Assistant Director, UWM Center for By-Products Utilization, Milwaukee, WI

    Ramme, BW
    Manager, Land Quality, We Energies Environmental Department, Milwaukee, WI

    Chun, Y-M
    Postdoctoral Fellow, UWM Center for By-Products Utilization, Milwaukee, WI

    (Received 25 March 2003; accepted 20 April 2005)

    Abstract

    Laboratory mixtures, pilot mixtures, and field construction mixtures were made to evaluate salt-scaling resistance of concrete incorporating large amounts of either Class C fly ash obtained from several different sources or Class F fly ash. The laboratory mixtures that incorporated Class C fly ash up to a fly ash to cementitious materials ratio (FA/Cm) of 60 % by mass exhibited very slight to moderate scaling. Results from the pilot mixtures indicate that it is possible to produce structural-grade, salt-scaling resistant concrete using up to 56 % Class C fly ash. Specimens of a field mixture containing 50 % Class C fly ash showed moderate to severe scaling, and specimens of a field concrete with 40 % Class F fly ash showed slight to moderate scaling. These field mixtures exhibited satisfactory salt-scaling resistance in actual pavements. Comparisons of strength and scaling results suggest that it would be beneficial to allow sufficient time for high-volume fly ash concrete to develop strength before it is subjected to salt-scaling actions.


    Paper ID: JAI11912

    DOI: 10.1520/JAI11912

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    Author
    Title Decing Salt-Scaling Resistance: Laboratory and Field Evaluation of Concrete Containing up to 70 % Class C and Class F Fly Ash
    Symposium , 0000-00-00
    Committee D18