REFLECTION CRACKING MODELS: REVIEW AND LABORATORY EVALUATION OF ENGINEERING FABRICS

A review of recent theoretical models for analyzing reflection cracking in pavements is presented. Four models are applicable to asphalt overlays of jointed-concrete pavements, and one model deals with asphalt overlays of existing flexible pavements. Both mechanistic and phenomenological models are reviewed, together with a critique of each model's shortcomings. A two-dimensional finite-element analysis of flexible overlay stress for jointed-concrete slabs subjected to seasonal and daily temperature changes is presented. The analysis shows that, contrary to some existing models, curling temperature gradients (cold or slab surface relative to bottom) produce joint openings that induce only tension stress in the overlay. A technique is presented for equating daily (curling) thermal loads to seasonal thermal loads in terms of equivalent maximum overlay stress. The finite-element analysis suggests that a reflection cracking model must consider the ratio of loading and temperature dependency of the asphalt overlay modulus in any stress calculation. Laboratory testing is currently being conducted to verify reflection cracking models and assess performance of geotextiles and stress-absorbing membrane interlayer systems to reduce cracking. (Author)

Media Info

  • Media Type: Print
  • Features: Figures; References;
  • Pagination: pp 18-25
  • Monograph Title: Engineering fabrics in transportation construction
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00381702
  • Record Type: Publication
  • ISBN: 0309035597
  • Files: TRIS, TRB
  • Created Date: Mar 30 1984 12:00AM