Effects of Supplementary Cementitious Materials on Apparent Activation Energy

    Volume 7, Issue 9 (October 2010)

    ISSN: 1546-962X

    CODEN: JAIOAD

    Published Online: 2 September 2010

    Page Count: 16


    Poole, J. L.
    Wiss, Janney, Elstner Associates, Inc., Dallas, TX

    Riding, K. A.
    Dept. of Civil Engineering, Kansas State Univ., Manhattan, KS

    Juenger, M. C. G.
    Dept. of Civil, Architectural, and Environmental Engineering, The Univ. of Texas at Austin, Austin, TX

    Folliard, K. J.
    Dept. of Civil, Architectural, and Environmental Engineering, The Univ. of Texas at Austin, Austin, TX

    Schindler, A. K.
    Dept. of Civil Engineering, Auburn Univ., Auburn, AL

    (Received 7 December 2009; accepted 3 August 2010)

    Abstract

    The application of the Arrhenius equation to characterize the progress of cement hydration requires the use of an apparent activation energy (Ea) value to describe the temperature sensitivity of the combined hydration reactions. Supplementary cementitious materials (SCMs) such as fly ash, ground-granulated blast-furnace slag, and silica fume are an integral part of most concrete mixtures, but their impact on Ea has not been fully explored for a wide range of cement and SCM compositions and replacement levels. This information is important in order to predict heat from the hydration of concrete or strength development using the “maturity method.” This paper examines the effects of SCMs on the apparent activation energy (Ea). It was observed that increasing amounts of Class F fly ash and silica fume generally lowered Ea, but the effects of slag and Class C fly ash were dependent on the composition of the cement, particularly the aluminate, alkali, and soluble sulfate contents.


    Paper ID: JAI102906

    DOI: 10.1520/JAI102906

    ASTM International is a member of CrossRef.

    Author
    Title Effects of Supplementary Cementitious Materials on Apparent Activation Energy
    Symposium , 0000-00-00
    Committee C01