RESPONSIVE BEHAVIOR OF FLEXIBLE PAVEMENTS

The primary responses of flexible pavements are defined using both elastic and viscolastic models, and it is shown that either elastic or viscoelastic or a combination of these theories may be used to formulate the mechanistic model to predict primary responses of flexible pavements when they are subjected to certain types of loading and environmental conditions. Two prototype pavements were tested under constant temperature and moisture conditions (care was taken to eliminate as much variability of the inplace material properties as possible). Thus different modes of loading were utilized in the testing program. Two mathematical models formulated from layer system theory were selected to simulate the behavior of the 2 prototype pavements. A three-layer linear viscoelastic-elastic computer program (VESYS I) and a pseudo non-linear elastic program (CHEV 5L W/ITERATION) were utilized to compute pavement surface deflections. A comparison of these values was then made with those measured in testing the two pavements. The asphalt characteriztaion procedures are detailed. Actual measured pavement deflections due to static and dynamic loadings were compared with predicted values. The results of the study show that linear visco-elastic theory does in general represent the time dependent behavior experienced by pavements under three different loading conditions. However, the predictive capability of the program is better under static and dynamic Type B loading than for Type A loadings. The instantaneous elastic deformation which takes place under static loading and the resilient deformation which takes place under dynamic loading was shown to be affected by the non-linearities of the pass-layer materials. The results of this research indicate that the pavement response to all modes of loading utilized in this study is time-dependent in nature and, all indications are that it is for the most part viscoelastic. Non-linearities are also evidenced for certain modes of loading.

  • Supplemental Notes:
    • Proceedings of the meeting held in Houston, Texas, February 1973.
  • Corporate Authors:

    University of Minnesota, Minneapolis

    155 Experimental Engineering Building
    Minneapolis, MN  USA  55455
  • Authors:
    • Kenis, W J
  • Conference:
  • Publication Date: 1973

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 542-563
  • Serial:
    • Volume: 42

Subject/Index Terms

Filing Info

  • Accession Number: 00127340
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 16 1975 12:00AM