Why Thin Overlays Are So Cost-Effective

The Ohio, Michigan, and North Carolina Departments of Transportation explain why they have chosen to put down thinner asphalt overlays in this article. Thinner budgets are part of the answer, but there is also long service life and low life-cycle cost; improved quality of ride; the ability to maintain grade and slope with minimal drainage impact; the ability to withstand heavy traffic and high shear forces. The author reports on the type of pavements each state DOT uses and why. He describes two special mix designs and how they gained popularity in Ohio. One is a blend of asphalt sand and masonry sand with 8.5 percent binder content; the other is a blend of 0.5 inch top-size coarse aggregate and sand-size particles with a minimum binder content of 6.4 percent. A silicon dioxide requirement for both types ensures good friction characteristics.

  • Authors:
    • Brown, Daniel C
  • Publication Date: 2009-9

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 01159527
  • Record Type: Publication
  • Source Agency: UC Berkeley Transportation Library
  • Files: BTRIS, TRIS, ATRI
  • Created Date: Apr 13 2010 7:52PM