SECTION OF PARKWAY IS RECYCLED

It has been found that old bituminous concrete pavements have a 100% salvage value even if they have to be removed. Tests have shown that high quality mixes can be obtained with salvaged material along with small quantities of new aggregate and asphalt cement. In early 1978, an effort was initiated to make certain improvements to a 3.7 mile section of George Washington Memorial Parkway, a dual highway in Montgomery County, Maryland. Work included drainage improvements, some wedge leveling course, and an open graded friction surface course. This included recycling approximately one mile of the parkway. Recycling consisted of removing 6-inches of bituminous concrete surfacing down to the aggregate surfacing. Crushed bituminous concrete was mixed with 50% new aggregate and 2.2% asphalt cement in a hot mix plant. The material produced by this method reached a temperature of about 220 F. This bituminous concrete was then placed on the newly graded compacted aggregate base in two 2 1/2-inch lifts to produce a 5-inch bituminous concrete base course.

  • Corporate Authors:

    Maryland Asphalt Association, Incorporated

    Baltimore Life Building, 901 North Howard Street
    Baltimore, MD  United States  21201
  • Publication Date: 1978-10

Media Info

  • Features: Photos;
  • Pagination: p. 8-9
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00188482
  • Record Type: Publication
  • Source Agency: Maryland Asphalt Paver
  • Files: TRIS
  • Created Date: Apr 12 1979 12:00AM