The history of past policies is briefly reviewed, and the procedures and operations are outlined of the Kossuth County paving program. The construction operations consisted of 7 phases. (1) Salvaging recyclable material was initiated by a Cat 14 motor grader with rear mounted ripper to scarify the pavement to a depth of 4.5 inches. The material was then broken up and hauled to the plant site for crushing. (2) One half of the roadway containing only gravel-clay base was scarified (to 4 inches), windrowed, moved and stockpiled on top of the unscarified base. The remaining half was worked in the same manner. (3) Widening of the roadbed followed. (4) The subbase construction was a routine procedure using the salvaged windrowed gravel base. (5) According to specifications, the salvaged asphalt was now crushed to a maximum size of 2 inches. The percentage of virgin asphalt to be added was determined. (6) Processing of the recycled asphalt consisted of the mixing operation and the lay down operation. (7) The final surfacing placed upon the recycled base was a standard 3-inch Type B Class I Asphaltic Concrete. The factors that must be considered in projects of this nature, relate to pavement performance, economics, environment, and conservation. It is observed that the recycled material is nearly as good as new, and any potential problems may be resolved. The costs involved in this project are discussed and the ways in which recycling could be an economical process are pointed out. Pollution is is noted to be a problem while conservation of fuel is an advantage associated with this project.

  • Corporate Authors:

    Iowa Department of Transportation

    Iowa Highway Research Board, 800 Lincoln Way
    Ames, IA  United States  50010
  • Authors:
    • Henely, R P
  • Publication Date: 1975-11

Media Info

  • Features: Tables;
  • Pagination: 29 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00131069
  • Record Type: Publication
  • Created Date: Apr 21 1976 12:00AM