Volume 39, Issue 5 (September 2011)

    CT Image Entropy Analysis Technique for the Determination of Damage to Indirect Tensile Test of Asphalt Mixtures

    (Received 12 October 2010; accepted 15 April 2011)

    Published Online: 2011

    CODEN: JTEOAD

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    Abstract

    This study identifies how the microstructure system of asphalt mixture is influenced by moisture and the Indirect Tensile Test (IDT) using digital image analysis methods. Concepts such as digital image segmentation technology, CT (Computer Tomography) value, grey scale of the image, edge detection, and entropy are introduced and incorporated to describe the image characteristics. The impact of moisture and the IDT test on the mixture is analyzed on 24 scanning sections of two specimens. Two moisture conditions are designed to treat the specimens separately before the indirect tension test according to the specification. The original internal structures of the specimens and the corresponding internal structures after the IDT test are obtained through CT scanning. An edge detection process is conducted to find the micro point contact between the binder and the aggregate using a Laplacian arithmetic operator. Differences in the destruction degree of different moisture conditions in IDT are shown through image entropy calculation. A statistical hypothesis test method, the Student t-test, is introduced to examine the significance of the calculation results. From the viewpoint of statistics, the test and calculation results of the 24 sections of the two specimens are of representative significance.


    Author Information:

    Zhang, Qian
    Associate Professor, School of Civil Engineering, Xi’an Univ. of Architecture and Technology, Xi’an, Shaanxi

    Ma, Juan
    Graduate Student, School of Civil Engineering, Xi’an Univ. of Architecture and Technology, Xi’an, Shaanxi

    Bai, Yan
    Lecturer, School of Science, Xi’an Univ. of Architecture and Technology, Xi’an, Shaanxi


    Stock #: JTE103446

    ISSN: 0090-3973

    DOI: 10.1520/JTE103446

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    Author
    Title CT Image Entropy Analysis Technique for the Determination of Damage to Indirect Tensile Test of Asphalt Mixtures
    Symposium , 0000-00-00
    Committee D04