Compaction capabilities of static steel and pneumatic and vibratory rollers for asphalt concrete pavements were evaluated using nuclear gages. The performance of these rollers was compared using the results of permeability tests and determinations of apparent migration of fine aggregate and asphalt toward the surface of the asphalt concrete. The test method used for the evaluation consisted (briefly), of selecting a 300-ft. test section one lane wide which will become an integral part of the highway under construction; one minute nuclear density readings were taken after each successive coverage until 95 percent relative compaction is reached or until no appreciable increase in density is obtained by additional rolling. Thirty density measuremnts are then made on randomly selected locations throught the 300-ft. test section. For compactor acceptance, the minimum mean relative compaction for each 100-ft. test section must be 95 percent, and none of the individual tests can be below 92 percent. Other reasons for rejection include ridges, indentations or other objectionable marks on the asphalt concrete after final rolling has been completed. Vibratory rollers which met the requirements are the Essick VR0540RE, Bomag-B.W. 200, Vibro-Plus-CC-50-A, Tampo (RS-288-A) and the Essick (VR-42-RE). Nine other vibratory rollers (all contained a single steel vibrating drum steel or pneumatic drive wheels) failed to meet the requirements. The investigation showed that the use of vibratory rollers produced lower asphalt concrete permeabilities than those obtained using pneumatic rollers either partially or exclusively. Vibratory rollers may cause slight migration of asphalt and/or asphalt coated fines to the surface. Vibratory rollers that operate at frequencies lower than 1700 RPM will leave undulations, giving the surface a "wash board" appearance. The double vibratory drum rollers tested have provided higher asphalt concrete densities with fewer than all the other types of compactors tested. Vibratory rollers using pneumatic drive wheels were not satisfactory due to "pick up" and/or final appearance of the pavement.

  • Corporate Authors:

    University of Minnesota, Minneapolis

    155 Experimental Engineering Building
    Minneapolis, MN  United States  55455
  • Authors:
    • Cechetini, J A
  • Conference:
  • Publication Date: 1974

Media Info

  • Features: Appendices; Figures; Photos; References; Tables;
  • Pagination: p. 384-416
  • Serial:
    • Volume: 43

Subject/Index Terms

Filing Info

  • Accession Number: 00125409
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 18 1975 12:00AM