The most important variable concerning a paving contractor during the compaction process is the time available to achieve the desired level of density. Once the asphalt concrete course has cooled below a certain temperature, additional compaction gains additional density. The mixture must be compressed to required air void content before asphalt cement in the material cools and significantly increases in viscosity. This causes an increase in mixture stiffness and increases resistance to compaction. The time available for compaction is the subject of this article. Six variables were found to have an effect on the rate of cooling of a layer of asphalt concrete placed on top of another existing layer of the same type of material: layer thickness, air temperature, base temperature, initial mix laydown temperature, wind velocity, and solar radiant flux (cloud cover).

Media Info

  • Features: References;
  • Pagination: p. 20-24
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00389990
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: Nov 30 1984 12:00AM