The characteristics were studied (by the Marshall method) of emulsified asphalt mixtures treated with various amounts of cement cured at predetermined temperatures and periods of time. Two grades of emulsified asphalt were used: CSS-1 and CSS-1h. The crushed aggregate used (from a commercial source) had a rough texture with low absorption, and 85 percent of the material retained in the No. 4 sieve was fractured. Stability and flow analyses were performed on each cured specimen (cured at 40F, 50F, and 120F) at room temperature (70 to 72 F). Two specimens from each group were tested for moisture content by drying for a 24-hour period in a 302 F oven. A sample was immersed in water for visual observation. Immersion compression investigations were also performed. The study indicates that emulsified asphalt mixtures requre the addition of cement to prevent moisture-induced deterioration and provide immediate stability. Although emulsified asphalts derived from low penetration asphalt cements (CSS-1h), when used in emulsion mixes produced high stability mixes, it is felt that the resultant mixes would become brittle with age causing ravelling of the surface. Moisture, either natural or induced, is necessary to activate the cement. The water available from the emulsion is either inadequate or otherwise unusable. The study also shows that dense graded, cement modified, emulsified asphalt cold mixes when properly proportioned, placed and compacted appear to be satisfactory for local service and secondary roads with low traffic count.

Media Info

  • Features: Appendices; Figures; Photos; References; Tables;
  • Pagination: p. 110-131
  • Serial:
    • Volume: 43

Subject/Index Terms

Filing Info

  • Accession Number: 00125399
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 18 1975 12:00AM