An improved method for measuring the permeability of compacted asphalt mixtures in the laboratory was developed. It eliminates the difficulties encountered with using a rubber membrane for sealing the specimen in a metal cylinder. In the new method, the specimen wall is coated with a one-part silicone rubber sealer that is applied as a paste with a spatula and is permanently flexible and waterproof. After the coating has cured and been checked for leaks, a known pressure difference is created by a vacuum across the specimen. The rate of air flow through the specimen is obtained at various differential pressure values. Flow rate is plotted against pressure difference, and the slope of the straight line portion of the curve is calculated. Permeability is calculated by using this slope value and the specimen height. The technique measures the true permeability, eliminates the possibility of specimen deformation during testing and the problems associated with other methods, permits no asphalt contamination, and is versatile with respect to aggregate gradation and asphalt grade. /Author/

Media Info

  • Media Type: Print
  • Features: Figures; Photos; References; Tables;
  • Pagination: pp 37-43
  • Monograph Title: Bituminous concrete materials, mixtures, and additives
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00185294
  • Record Type: Publication
  • ISBN: 0309026881
  • Files: TRIS, TRB
  • Created Date: Jan 13 1979 12:00AM