The rural roads in California's Delta region are built on alluvium that is always shifting, making it prohibitively expensive to repair them with conventional means. The California Department of Transportation (Caltrans)is experimenting with foamed or expanded asphalt used along with in-place base recycling. One stretch of road was near complete failure in late 2002, so it became a testing ground for the new method. Conventional reconstruction would have meant very limited life, but cold foaming gives another 10 years of operability. The expanded asphalt forms a mortar or glue that bonds particles. The technology sidesteps several aspects of conventional asphalt such as the use of solvents and the time waiting for the break for emulsions. The road was treated in two passes with the initial foamed surface compacted then rough-graded, compacted again and find graded. A rubberized chip seal was to be placed as a driving surface. It can carry traffic immediately. The project has served to introduce local agencies to the process.

  • Availability:
  • Supplemental Notes:
    • Special Recycling Section
  • Corporate Authors:

    James Informational Media, Incorporated

    2720 South River Road, Suite 126
    Des Plaines, IL  United States  60018-
  • Authors:
    • Kuennen, T
  • Publication Date: 2003-7


  • English

Media Info

  • Features: Photos;
  • Pagination: p. 16-19
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00961160
  • Record Type: Publication
  • Source Agency: UC Berkeley Transportation Library
  • Files: BTRIS, TRIS
  • Created Date: Aug 4 2003 12:00AM