Over the last few years, the New York State Deparment of Transportation has been investigating the feasibility of using vibratory compaction on asphalt concrete. A total of 10 different roller models were used on three overlay contracts and seven new construction projects. The rollers represented a wide range of dimensional and operating characteristics, which initially led to greatly varying results. Discovery of two important operating parameters resulted in development of performance criteria applicable to any roller. These parameters--the spacing of drum impacts and their magnitudes--can be controlled by adjusting forward speed, drum frequency, and drum amplitude. Impact magnitude, termed unit total applied force, was correlated with layer thickness to produce the ranges necessary for each lift. As expected, the force necessary for adequate compaction increased with lift thickness, but on lifts thinner than 76 mm (3 in) the maximum force applied was found to be equally critical. When the force was too great, roller rebound occurred, which reduced densities. Vibratory rollers also compacted single-lift wearing courses and base courses--6.3 to 20.3 cm (2.5 to 8 in) thick respectively--more efficiently than conventional rolling. When operated properly, vibratory rollers were found to be effective in compacting asphalt concrete. Operating criteria were developed to determine the ability of any roller to compact a given lift thickness. /Author/

Media Info

  • Media Type: Print
  • Features: Figures; Maps; References; Tables;
  • Pagination: pp 46-53
  • Monograph Title: Bituminous concrete materials, mixtures, and additives
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00185296
  • Record Type: Publication
  • ISBN: 0309026881
  • Files: TRIS, TRB
  • Created Date: Jan 13 1979 12:00AM