This article presents results of tests carried out by the National Board of Public Roads and Waterways on the compaction of subbases, frost blanket courses, and the unbound section of base courses. The tests showed that: (1) the maximum dry density can be determined on the basis of the particle size distribution. Formulae, developed specially for these tests, enable the dry density to be rapidly determined on site; (2) if the aggregates contain a higher proportion of shale than normal, the effect of the shale on dry density must be investigated separately; (3) the determination of the optimum moisture content of the aggregates in the sub-base and frost blanket if not important in practice; an average figure can be used; (4) the sand volumeter method can give very in accurate figures; great care must be used in its application; (5) the degree of compaction at the upper part of the subbase was markedly greater than at depth of 20 or 30 cm; (6) during compaction some resoftening was observed; (7) the properties of the material used, thickness of the courses, and quality of the subgrade affect the degree of compaction; and (8) several methods should be used if an accurate determination of the degree of compaction is to be obtained.

  • Corporate Authors:

    Finnish Road Association

    Vironkatu 6
    00170 Helsinki 17,   Finland 
  • Authors:
    • Annila, M
  • Publication Date: 1973


  • Finnish

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 292-304
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00265244
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Feb 27 1975 12:00AM