Effect of Calculation Methods on Cement Paste and Mortar Apparent Activation Energy

    Volume 1, Issue 1

    ISSN: 2165-3984

    CODEN: ACEMOAD

    Published Online: 1 September 2012

    Page Count: 19


    Siddiqui, Sarwar
    Candidate, Construction Materials Research Group, The University of Texas at Austin, Austin, Texas

    Riding, Kyle A.
    Assistant Professor, Civil Engineering, Kansas State University, Manhattan, KS

    (Received 7 November 2011; accepted 5 July 2012)

    Abstract

    Concrete hydration and strength development rates are a function of the concrete temperature, with higher temperatures leading to faster rates of reaction. The equivalent age maturity method is a commonly used method to model concrete property development under varying temperature curing conditions. The equivalent age maturity method requires the use of an activation energy value to account for the temperature sensitivity of the chemical reactions. Several experimental methods and calculation techniques are currently used to quantify the activation energy for concrete. This study compared the activation energy calculated using several different numerical methods from mortar strength, time of set, chemical shrinkage, and isothermal calorimetry paste and mortar experiments. The activation energy calculated from isothermal calorimetry experiments was found to be similar for paste and mortar. This indicates that aggregates have very little effect on the activation energy, which would permit the use of an activation energy calculated from cement paste to be used on concrete.


    Paper ID: ACEM20120011

    DOI: 10.1520/ACEM20120011

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    Author
    Title Effect of Calculation Methods on Cement Paste and Mortar Apparent Activation Energy
    Symposium , 0000-00-00
    Committee C01