USE OF FWD DATA FOR PREDICTION OF BONDING BETWEEN PAVEMENT LAYERS

In this paper, a new back-analysis method is suggested to assess the bonding condition between bituminous layers in addition to the pavement layer stiffnesses, from Falling Weight Deflectometer (FWD) test results. The shear bond stiffness at the interface is considered as a variable affecting the FWD deflections and therefore back-calculated in a similar manner to a layer stiffness. A sensitivity analysis carried out on theoretical pavements showed that, assuming full bonding between bituminous layers instead of the actual values will change the FWD back-analyzed bituminous and sub-base stiffnesses by up to 50% and will not affect the sub-grade stiffness. Case studies are presented describing the evaluation of several flexible pavements using the new back-analysis process. Poor bonding was suspected between the bituminous layers due to several reasons. Re-testing the above pavements after 6 months indicated an improvement of bonding condition between bituminous layers after traffic and at higher temperatures.

Language

  • English

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Filing Info

  • Accession Number: 00800358
  • Record Type: Publication
  • Files: TRIS, ATRI
  • Created Date: Oct 11 2000 12:00AM