Sand stabilisation using foamed asphalt - a laboratory performance study

The shortage of high quality aggregates and increased traffic in many areas in the arabian gulf have created a need for stabilising local available desert sands for use as pavement base and subbase. The effects of different variables on foamed asphalt mix design were investigated in a laboratory study. The study included an evaluation of asphalt foam properties and a range of local sand types. The variables tested were foamed asphalt content, moisture content, curing condition, type and content of fines and testing temperature. The susceptibility of foamed asphalt mixes to moisture damage was found to be significantly reduced by limestone powder in amounts needed to modify the fine fraction of sand gradation. Also, the addition of hydrated lime or portland cement in amounts up to 3 per cent by weight of sand resulted in a significant improvement of resistance to moisture deterioration. Structural evaluation of foamed asphalt mixes was compared with that of other hot sand asphalt mixes commonly used as base material in kuwait under local environmental conditions. Based on subgrade deformation damage criteria, a structural equivalency ratio of 1:1 was obtained. From an analysis of permanent deformation under local service pavement temperatures, using the shell creep procedure, foamed asphalt base layers showed 40 to 50 per cent less rutting than that predicted for hot sand asphalt layer of the same thickness. It appears that properly designed foamed asphalt sand mixes have adequate stability to resist excessive permanent deformations under traffic loads in regions with relatively high service temperatures (a).

Language

  • English

Media Info

  • Pagination: 50-62
  • Monograph Title: Study on bitumen with a view to improving road surfacing
  • Serial:
    • Volume: 13
    • Issue Number: 3

Subject/Index Terms

Filing Info

  • Accession Number: 01427836
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ATRI
  • Created Date: Aug 24 2012 2:31PM