NONDESTRUCTIVE PAVEMENT EVALUATION: THE DEFLECTION BEAM

The prediction of the effects of vehicle motion on pavements is time dependent. Current 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 on by a vehicular input produces an output response. Relating the two is a time-dependent transfer function that contains within it the properties of the system. This function is obtained, in a mathematical sense, by suing Laplace transformations without the need to simulate respective material performance or to determine values for preselected descriptors. The time-dependent transfer functions can be used to predict the response and the performance of a pavement system when it is subjected to an imposed load. The investigation was carried out be extending transfer function theory in connection with a finite convolution procedure to define the time-dependent transfer functions of a pavement. Moving trucks and aircraft were used in full scale dynamic tests in service environments (six highway and two runway cross sections). It was shown that the time-dependent transfer functions obtained represent the characteristics of flexible pavements. Changes in parameters of the functions reflect changes in the performance and the condition of the pavement. /Author/

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/trr/1978/666/666-004.pdf
• Record URL:
  • https://scholar.google.com/scholar_lookup?title=NONDESTRUCTIVE+PAVEMENT+EVALUATION%3A+THE+DEFLECTION+BEAM&author=G.+Baladi&author=M.+Harr&publication_year=1978
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• Supplemental Notes:
  • This paper appeared in Transportation Research Record No. 666, Pavement Surface Properties, Evaluation, and Shoulders. Publication of this paper sponsored by Committee on Pavement Condition Evaluation. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
• Authors:
  • Baladi, G Y
  • Harr, M E
• Publication Date: 1978

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 19-26
• Monograph Title: Pavement surface properties, evaluation, and shoulders
• Serial:
  • Transportation Research Record
  • Issue Number: 666
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Aircraft; Deflection; Flexible pavements; Load tests; Mathematical models; Nondestructive tests; Pavement performance; Rolling contact; Test procedures; Transfer functions; Trucks
• Subject Areas: Aviation; Highways; Motor Carriers; Pavements; Vehicles and Equipment;

Filing Info

• Accession Number: 00189505
• Record Type: Publication
• ISBN: 0309028051
• Files: TRIS, TRB
• Created Date: Apr 12 1979 12:00AM