New developments in hot mix asphalt (HMA) technology promise to develop a pavement that will last a lifetime, or at least seem that way to passing motorists. An approach gaining favor with pavement design engineers uses the concept of full-depth asphalt (FDA) to ensure a pavement's ongoing structural performance. Conventional FDA pavement, which uses two layers of HMA over subgrade, has been used for years in the United States and abroad. Modified FDA pavement, which has been tested in Oregon and elsewhere, uses a flexible, asphalt-rich bottom layer that resists bottom-up fatigue cracking, a stiff middle load-bearing layer, and a top layer that resists rutting. Such pavements are very durable at the bottom, and any cracks that develop are confined to the surface layer. Recent surveys have shown that people have high expectations of a smooth ride, yet do not want to be inconvenienced by roadway reconstruction. Overwhelmingly, their priority is longer-lasting pavements. Warranties are a way to increase quality, provide a longer-life pavement, and get a good start on permanent pavement.

  • Authors:
    • Rasche, R
  • Publication Date: 2000-3


  • English

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Filing Info

  • Accession Number: 00792458
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 30 2000 12:00AM