Volume 3, Issue 1

    Investigating Applicability of Complex Modulus and Creep Compliance Interconversion in Asphalt Concrete

    (Received 24 September 2013; accepted 26 December 2013)

    Published Online: 2014

    CODEN: ACEMOAD

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    Abstract

    Creep compliance, relaxation, and complex modulus are fundamental rheological properties used to characterize the viscoelastic behavior of asphalt concrete mixtures. These response functions can be determined either through the frequency domain test known as the complex modulus test (E*) or from time domain tests such as those for the creep compliance D(t) and relaxation modulus E(t). Theoretically speaking, all these functions should be transferred through mathematical interconversion techniques. In order to check the applicability of these mathematical methods to actual test data, complex modulus and static creep tests were carried out in this research on specimens with various volumetric properties. Sign-controlled Prony series representation was fitted to the actual experimental data. The data were then interconverted from frequency domain to time domain via the application of interconversion techniques. It was found that the functions resulting from interconversion methods were not necessarily in agreement with the test results. Differences in the nature of the test domain and specimen-to-specimen differences resulted in discrepancies between the relaxation modulus determined from the complex modulus and that from the static creep test. Finally, the combined error technique was applied to available data in order to minimize the existing deviation.


    Author Information:

    Ebrahimi, Milad
    Ph.D. Student, Dept. of Civil and Natural Resources Engineering, Univ. of Canterbury, Christchurch,

    Saleh, Mofreh
    Senior Lecturer, Dept. of Civil and Natural Resources Engineering, Univ. of Canterbury, Christchurch,

    Moyers Gonzalez, Miguel
    Senior Lecturer, Dept. of Mathematics and Statistics, Univ. of Canterbury, Christchurch,


    Stock #: ACEM20130103

    ISSN: 2165-3984

    DOI: 10.1520/ACEM20130103

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    Author
    Title Investigating Applicability of Complex Modulus and Creep Compliance Interconversion in Asphalt Concrete
    Symposium , 0000-00-00
    Committee D04