LABORATORY INVESTIGATION OF THE USE OF FOAMED ASPHALT FOR RECYCLED BITUMINOUS PAVEMENTS

Recent advances in foamed-asphalt technology have created new interest in the subject. A series of studies of foamed asphalt was conducted in Indiana. The results of one of these studies are described. The study had three objectives. The first was to determine the foaming characteristics of a selection of asphalts commonly used in construction in Indiana. Foaming characteristics in terms of expansion ratio and half-life were recorded. The second objective was to evaluate the performance of three of these asphalts as binders for a recycled bituminous paving mixture using (a) the gyratory and the Marshall compactive methods and (b) the Marshall stability testing procedure. The third objective was to evaluate the effect of curing time and moisture on the stability of a recycled mix. Three asphalts were chosen for the study based on their foaming characteristics. A foaming temperature of 325 deg F (160 deg C) and an added water content of 2 percent were selected as the best conditions for optimum foam volume and half-life. Excellent Marshall stability values were obtained with 0.5 and 1.0 percent foamed asphalt added to the recycled mixtures. Curing time had a marked effect on the lower additions of foamed asphalt. The effect of water decreases with increased amounts of foamed asphalt. (Author)

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 80-87
  • Monograph Title: Asphalt materials, mixtures, construction, moisture effects and sulfur
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00390795
  • Record Type: Publication
  • ISBN: 0309035546
  • Files: TRIS, TRB
  • Created Date: Dec 30 1988 12:00AM