The motion of vehicles over pavements makes the problem of predicting consequent effects time dependent. Present design procedures, however, account for this motion as a sequence of equivalent static conditions reduced to passes or coverages. A solution to this problem was obtained by verifying the following hypothesis: A pavement system operated upon by a vehicular input produces an output response. Relating the two is a time dependent transfer (TDT) function that contains within it the properties of the system. This function is obtained, in a mathematical sense, using Laplace transformations, without the need to simulate respective material performance or to determine values for preselected descriptors. The TDT functions can be employed to predict a pavement system's response and performance when subjected to an imposed load. The investigation was carried out by extending transfer function theory in connection with a finite convolution procedure to define the pavement's TDT functions. Full scale dynamic tests (moving trucks and aircraft) were performed in service environments (6 highway and 2 runway cross-sections). It has been shown that the TDT functions obtained do represent the characteristics of flexible pavements. Changes in parameters of the TDT function reflect changes in pavement performance and conditions.


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    Title :

    Nondestructive Testing and Evaluation of Flexible Highway Pavements


    Contributors:
    M. E. Harr (author) / G. Y. Baladi (author)

    Publication date :

    1977


    Size :

    178 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English







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