"Square wheel" impact rollers, which are being used increasingly in southern Africa, have made possible certain improvements in construction techniques. Originally proven for compacting 'collapsing' soils, the roller has since been found to provide effective in situ compaction to depths of 2 to 4 M in uniform sands at low moisture contents, and to depths of greater than 0.5 M in cohesive materials, although experience of the latter is limited at present. This depth-effectiveness has permitted the use of thick lifts in construction and this in turn has permitted the use of larger rock sizes in fill. The depth effectiveness also achieves uniform density profiles over large areas and thus can reduce excavation requirements considerably it is essential to improve a non-uniform foundation. In desert and semi-desert areas, the technique has made year-round compaction programmes possible without having to import extra water. Limitations on the use of impact rollers are also discussed. /Author/TRRL/


  • English

Media Info

  • Features: Figures; References;
  • Pagination: p. 1-14
  • Serial:
    • Volume: 8
    • Issue Number: 1

Subject/Index Terms

Filing Info

  • Accession Number: 00164149
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS, ATRI
  • Created Date: Jun 28 1978 12:00AM