PERFORMANCE OF HOT MIX ASPHALT USING COARSE AND SKIP GRADED AGGREGATES

The aggregate gradation of hot-mix asphalts (HMA) applied in southern Nevada prior to 1989 usually were above the maximum density line. Later, however, various asphaltic concrete pavements using an aggregate gradation curve falling below the maximum density line for any nominal size aggregate were placed in southern Nevada. The latter pavements have shown improved resistance to rutting and permanent deformation. In this paper, data from four mix design and performance projects in which the aggregate gradations range from continuous coarse graded to skip coarse graded are presented. Maximum rut depths were measured for all traffic lanes at major intersections, calculating average rut depth for each project. Rutting measurements were taken after at least one annual cycle of operation. These measurements reveal a 50 percent rutting reduction when the continuous coarse graded aggregate HMA was employed rather than the pre-1989 fine graded aggregate HMA. The rutting was further reduced by 50 percent when skip graded aggregate HMA was used in place of the continuous coarse graded HMA.

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00723367
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 28 1996 12:00AM