MECHANISTIC PREDICTIONS OF THE PERFORMANCE OF PAVEMENTS IN THE SHRP LTPP PROGRAM

The calibrated mechanistic pavement performance prediction method developed in the SHRP A005 contract is an advance from the phenomenological prediction methods that have been used for the last two decades. The new methods make possible the use of material properties for specifications; simpler, more straightforward tests to determine these material properties; and permit the calibration of the models and specifications to local or regional conditions and materials; and are the basis of the new SHRP mix design procedure, SUPERPAVE tm. The new concepts that have been employed in the prediction models could not have been done without the capabilities of the latest generation of microcomputers. The new concepts used in the predictions of pavement distress include the following: (1) microcracking in fatigue crack initiation; (2) shearing stress propagation of fatigue cracks; (3) rutting due to both volumetric and shearing plastic strains; (4) use of fracture mechanics and fracture properties to predict crack initiation ;and propagation; (5) use of plasticity theory and plastic properties including cohesion and friction angles to predict rutting; (6) use of system identification methods to calibrate the prediction models; (7) both "forward" and "backward" calibration can be done.

Language

  • English

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 38-75

Subject/Index Terms

Filing Info

  • Accession Number: 00667773
  • Record Type: Publication
  • Report/Paper Numbers: VTI 1A, Part 4
  • Files: TRIS, ATRI
  • Created Date: Sep 29 1994 12:00AM