LABORATORY INVESTIGATION OF FLEXIBLE-PAVEMENT RESPONSE BY USING TRANSFER FUNCTIONS

Transfer-function theory was applied to examine the behavior of flexible highway pavements. A numerical computation was used to derive pavement response functions from impulse testing of three-layer models of flexible pavements. Analytical computations formed the basis for calculating deflections that result from static and repeated loads. It was hypothesized that more-significant parameters than are commonly used could be obtained under controlled laboratory conditions. By using nonlinear regression, the response functions were approximated by a mathematical model to include these parameters. The derived model was used as the input for the analytical computations. The adequacy of the developed model was verified by comparing predicted and measured deflections. A silty-sand subgrade, a crushed- aggregate base, and an asphalt-concrete surface were the components of the three-layer systems. Model pavements of two different surface-course thicknesses were tested statically and dynamically at three different stress levels. To permit the tests to be performed inside a constant- temperature room, the maximum possible size adopted for the model pavements was 0.8 x 9.8 x 9.6 m (32.5 x 32.5 x 23.25 in). Test temperatures were 10, 24, and 38 (c) (50, 75, and 100 deg (F). Deflections were measured at five locations. It was shown that time-dependent behavior of flexible pavements can be represented by response functions. The parameters in these functions are regarded as descriptors of pavement characteristics and have the capability of predicting pavement response. (Author)

Media Info

  • Media Type: Print
  • Features: Figures; Photos; References; Tables;
  • Pagination: pp 36-42
  • Monograph Title: Evaluation and analysis of flexible pavement components and properties
  • Serial:

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Filing Info

  • Accession Number: 00322995
  • Record Type: Publication
  • ISBN: 0309030684
  • Files: TRIS, TRB
  • Created Date: Apr 15 1981 12:00AM