WATER SUSCEPTIBILITY OF BASE GRAVEL MATERIALS . THIRD INTERNATIONAL CONFERENCE ON BEARING CAPACITY OF ROADS AND AIRFIELDS. PROCEEDINGS, NORWEGIAN INSTITUTE OF TECHNOLOGY, TRONDHEIM, NORWAY, JULY 3-5 1990. VOLUMES 1-2

This paper describes research using microscopic thin section preparation of roadbase gravel specimens to investigate the influence of grain size distribution and the total amount of fines upon their water infiltration capabilites and hence potential loss of strength during the spring thaw. In particular, the investigation attempts to determine: (a) the amount of fines less than 75 micro m that a roadbase gravel can tolerate before losing strength; and (b) how the fine ratio influences strength. Both Hovinmoen and Hjera gravel was used to produce roadbase materials between 5.5 to 10.4% by weight. Optimal amounts of Epoxy was added to these gravels and each specimen was compacted to dry densities corresponding to a standard Proctor compaction (2.0-2.1 g per cubic cm). The thin sectors show that the fines did influence the way in which the matrix of epoxy and gravel particles were arranged in the pores and around larger particles. Three types of structure were discernible. When fines content of less than 75 micro m is: (a) less than 70%, a well drained pore system exists; (b) between 7 and 9%, the pore channel system is narrower and less interconnected but drainage capability still exists; and (c) greater than 9%, where the grain structure gets densily packed, the pore system lacks integration, and drainage capability is lost. The conclusion is that in order to classify a roadbase gravel by its water surceptibility, the amount of fine less than 75 micro m should be used. (TRRL)

  • Availability:
  • Corporate Authors:

    Tapir

    Trondheim University, Gloeshaugen
    Trondheim-NTH,   Norway 
  • Authors:
    • HAUCK, C
  • Publication Date: 1990

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00612270
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • ISBN: 82-519-1033-1
  • Files: ITRD, TRIS
  • Created Date: Aug 31 1991 12:00AM