Use of expanded clay in road embankments built on clay is becoming increasingly common. Its density is usually 300 kg/cu M, but in design calculations a future density of 600 kg/cu M is allowed for. Recent investigations indicate, however, that maximum density is only 450-550 kg/cu M. In-situ and laboratory tests were performed in order to determine the actual final density. Evaluation of the results shows that, in a road embankment, well graded expanded clay of 0-32 mm size does not increase above 500 kg/cu M. The conditions for this to be true are: (1) the material must be well drained, (2) dry density on delivery must not exceed 300 kg/cu M. It is also recommended that, (3) the specially heavy 0-4 mm fraction should be removed on delivery, (4) to avoid excessive compaction, the expanded clay should be single-size, (5) to prevent penetration of pavement material and gravel on slopes into the expanded clay, this should be as well graded as possible. In view of the above, the 4-30 mm fraction appears most suitable for embankments. In order that the total production may be utilised, however, the 10-20 mm fraction or the 10-30 mm fraction, with 70 per cent minimum within 10-20 mm, can be used. /TRRL/

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  • Corporate Authors:

    Svenska Vag-Och Vattenbyggaren Riksforband

    Regeringsgaten 98
    S-11139 Stockholm,   Sweden 
  • Authors:
    • Ismael, E
    • Janzon, A
  • Publication Date: 1978


  • Swedish

Media Info

  • Features: Figures; Photos; Tables;
  • Pagination: p. 56-59
  • Serial:
    • Vag-Och Vattenbyggaren
    • Volume: 24
    • Issue Number: 1
    • Publisher: Svenska Vag-Och Vattenbyggaren Riksforband
    • ISSN: 0042-2177

Subject/Index Terms

Filing Info

  • Accession Number: 00184396
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Jan 13 1979 12:00AM