The most often experienced failure mode of seal coats are chip embedment and loss of cover aggregate in the wheel path. Several factors are identified as contributing to the failure of seal coats, the most important of which is binder and aggregate quality. A significant side benefit of a seal coat is increased skid resistance which will be lost if the seal coat fails. Strength and durability of the asphalt binder can be improved by additives. Those discussed are: rubber, block co-polymers, thermoplastic polymers and metal complexes. Durability and retention of aggregate can be improved by pre-coating or use of larger aggregate. Alternatives to the present seal coat method are discussed and relative costs are presented. these include open graded and dense graded friction courses, modified single and double surface treatments, sprinkle treatment, surface texturing, calined bauxite and epoxy resin binder. (A)

  • Corporate Authors:

    Alberta Transportation and Utilities

    250, 11044-82 Avenue
    Edmonton, Alberta T6G 0T2  Canada 
  • Authors:
    • CHICHAK, M F
  • Publication Date: 1989-6


  • English

Media Info

  • Pagination: 16 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00674426
  • Record Type: Publication
  • Source Agency: Transportation Association of Canada (TAC)
  • Files: ITRD
  • Created Date: Mar 8 1995 12:00AM