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    Volume 38, Issue 2 (March 2015)

    Condition Assessment of Cementitious Materials Using Surface Waves in Ultrasonic Frequency Range

    (Received 14 January 2014; accepted 4 December 2014)

    Published Online: 2015

    CODEN: GTJODJ

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    Abstract

    Surface waves propagating in a medium provide information about the mechanical properties and condition of the material. Variations in the material condition can be inferred from changes in the surface wave characteristics. Multichannel analysis of surface waves (MASW) is a well-established surface wave method used for determination of the shear-wave profile of the soil layers near the surface. The MASW test configuration is also applicable to assess the condition of construction materials using appropriate frequency range. Previous studies on the detection of surface-breaking cracks in concrete elements, using the dispersion and attenuation of ultrasonic waves, were successful; however, a complete damage assessment of the whole element was not in the scope of these studies. In this study, different wave characteristics, such as Rayleigh wave velocity, wave attenuation, and phase velocity dispersion, are investigated to evaluate their sensitivity to the damage in a medium. The condition of a test specimen, which is a half-space medium made of cement and sand, is evaluated using ultrasonic transducers for different damage cases. The recorded signals are processed using the Fourier and wavelet transforms to determine the surface wave characteristics. A new dispersion index (DI) is introduced, which represents the global correlation between the dispersion of phase velocity and damage level. All features are found to be capable of reflecting the damage in the test medium with different levels of sensitivity. Among the investigated parameters, the proposed dispersion index shows high sensitivity and linear correlation with the damage.


    Author Information:

    Kırlangıç, Ahmet Serhan
    Research Fellow, School of Engineering, Cranfield Univ., Cranfield, Bedford, Bedfordshire,

    Cascante, Giovanni
    Professor, Dept. of Civil Engineering, Univ. of Waterloo, Waterloo, ON

    Polak, Maria Anna
    Professor, Dept. of Civil Engineering, Univ. of Waterloo, Waterloo, ON


    Stock #: GTJ20140011

    ISSN:0149-6115

    DOI: 10.1520/GTJ20140011

    Author
    Title Condition Assessment of Cementitious Materials Using Surface Waves in Ultrasonic Frequency Range
    Symposium ,
    Committee C09