A LABORATORY AND FIELD STUDY ON THE USE OF ELASTOMERS IN HOT-MIX EMULSIFIED ASPHALTS

EXPERIMENTAL DATA ON FOUR PAVING MIXTURES AFTER 0, 1, AND 2 YEARS IN SERVICE ARE EXAMINED. MIXTURE A IS AN EMULSIFIED HOT-MIXED ASPHALTIC MIXTURE WITH NO LATEX ADDITIVE. MIXTURES B AND C ARE EMULSIFIED HOT- MIXED ASPHALTIC MIXTURES WITH 1.5 AND 3% RUBBER ADDITIVE. AN 85- TO 100- PENETRATION ASPHALT CEMENT WITH NO ADDITIVES WAS USED IN THE CONTROL MIXTURE D. THE SIGNIFICANCE OF RUBBER ADDITIVES IN THE MIXTURE BEHAVIOR WAS INVESTIGATED BY PERFORMING COMPRESSIVE STRENGTH, CREE, FLEXURAL FATIGUE, FLEXURAL STRENGTH, AND MARSHALL STABILITY TESTS ON ASPHALTIC MIXTURES. THE EXTRACTED AND RECOVERED BINDERS WERE ALSO TREATED FOR PHYSICAL CHARACTERISTICS. THE FOLLOWING ARE CONCLUSIONS REACHED FROM THIS STUDY. (1) THE EVALUATION OF ENGINEERING PROPERTIES OF MIXTURES AT 0 YEAR IN SERVICE INDICATES THAT MIXTURE C WITH 3% ADDITIVE IS SUPERIOR TO THE OTHER MIXTURES. (2) THE EVALUATION OF ENGINEERING PROPERTIES AFTER 1 YEAR IN SERVICE INDICATES AN AGE-HARDENING TEND FOR MIXTURE D. MIXTURS A, B, AND C SHOW SLIGHT AGE-SOFTENING EFFECTS. (3) THE EVALUATION OF ENGINEERING PROPERTIES AFTER 2 YEARS IN SERVICE INDICATES THAT MIXTURE D HAS CONTINUED ITS AGE-HARDENING TREND. MIXTURE A WITH NO ADDITIVE FOLLOWS AN AGE-SOFTENING TREND. RUBBERIZED MATERIALS IN B AND C APPEAR TO BE APPROACHING THEIR INITIAL ENGINEERING CHARACTERISTICS. (4) MIXTURE C, WITH 3% RUBBER ADDITIVE, HAS REMAINED SUPERIOR TO THE OTHER MIXTURES AS RELATED TO TEMPERATURE SUSCEPTIBILITY. THIS MIXTUE IS THE LEAST TEMPERATURE-SUSCEPTIBLE, AND MIXTURE D IS THE MOST TEMPERATURE-DEPENDENT. THE SUPERIORITY OF MIXTURE C IS ALSO APPARENT FROM FLEXURAL STRENGTH AND FLEXURAL FATIGUE DATA. /AUTHOR/

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 33-41
  • Monograph Title: Asphalt mixture characterization and asphalt grading
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00211771
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Apr 2 1973 12:00AM