After pointing out that good compaction increases durability, reduces deformation and increases stiffness and strength, the authors discuss present specifications and the methods used to measure the state of compaction. Studies of a number of factors that affect the state of compaction are reviewed: these include aggregate type, stiffness of working platform, binder content, compacture effort (including correlation between roller passes and level of compaction and their distribution across the laid width), traffic, roller speed, temperature, thick lift construction. Methods of increasing compaction on the nearside are laying the hard shoulder and nearside lane together and modifying the pattern of rolling operations. The relation between compaction and pavement performance is studied and a detailed investigation made of the deflection of the macadam base and its foundation, the dynamic modulus of the macadam and the tracking of cores at elevated temperatures. It is concluded that improving compaction improves pavement performance, and that it is possible to construct more economic macadam bases by reducing binder content and improving compaction. For the covering abstract of the seminar see IRRD abstract no 212145. /TRRL/

  • Corporate Authors:

    Asphalt and Coated Macadam Association, Limited

    25 Lower Belgrave Street
    London SW1,   England 
  • Authors:
    • Lister, N W
    • Powell, W D
  • Publication Date: 1974

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 54 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00097678
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Conf Paper
  • Files: ITRD, TRIS
  • Created Date: Sep 30 1975 12:00AM