A LABORATORY EVALUATION OF RUBBER-ASPHALT PAVING MIXTURES

Several rubber modified asphalts and their corresponding aggregate mixtures were evaluated in the laboratory with respect to their physical characteristics. Results obtained on the properties of those rubberized asphalt binders were compared to those of the original untreated asphalts. The data would seem to indicate that an acceptable cement can be expected provided the quantity of rubber additive is closely controlled. Bituminous mixtures were molded using the mechanical Marshall Hammer and also the Gyratory Compactor. The results obtained on the Gyratory compacted specimens would indicate that for the same binder content, rubberized asphalt mixes possessed higher Marshall stabilities, equal or lower flow values, and less tendency to flush or bleed. Certain rubberized asphalts showed a capability of being used at an asphalt level in excess of that found optimum for unmodified asphalt. In addition, no loss of compaction or adhesion was found for rubberized asphalt paving mixtures.

Subject/Index Terms

Filing Info

  • Accession Number: 00082857
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: #79 Final Rpt.
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Apr 8 1975 12:00AM