THE INFLUENCE OF HAUL DISTANCE ON HARDENING OF ASPHALTIC BINDER IN HOT BITUMINOUS CONCRETE

RESULTS ARE PRESENTED OF A STUDY TO DETERMINE THE EFFECT OF HAULING DISTANCE ON ASPHALT HARDENING IN HOT ASPHALTIC CONCRETE MIXTURES. IN ADDITION TO DISTANCE /TIME/, THE FACTORS STUDIED WERE ASPHALT SOURCE, MIX TEMPERATURE AND LOCATION AND DEPTH IN THE HAULING TRUCK. ALL BUT TWO OF THE MIXTURES STUDIED WERE WEARING COURSE TYPES /GEORGIA TYPE E/ AND INCLUDED 60/70 PENETRATION ASPHALT FROM 3 REFINERY SOURCES. THE PRINCIPAL HARDENING CRITERION WAS VISCOSITY. MODIFIED STANDARD DUCTILITY TESTS AT 50 F AND INFRARED SPECTRA WERE USED AS OTHER HARDENING CRITERIA. THE FINDINGS INDICATED THAT ALL THREE ASPHALTS HARDENED DURING HAUL BUT TO DIFFERENT DEGREES AND THAT THE AMOUNT OF HARDENING DEPENDED ON HAUL TIME. IT WAS FOUND THAT MATERIAL NEAR THE SURFACE OF THE LOAD DID NOT HARDEN TO THE SAME EXTENT AS INTERIOR PORTIONS. MATERIAL LOCATED AT THE FRONT OF THE TRUCK ALSO TENDED TO SHOW LESS HARDENING. INFRARED SPECTRA REFLECTED HARDENING AS CHANGES IN THE 2.9, 5.9 AND 9.7 MICRON REGIONS OF THE SPECTROGRAMS. /BPR/

  • Supplemental Notes:
    • Hpr-1/2/, PART II, BPR NO 10, STATE' RESEARCH REF NO 6302
  • Corporate Authors:

    University of Georgia, Experiment

    Georgia Experiment Station
    Experiment, GA  United States 

    Georgia State Highway Department

    ,    
  • Authors:
    • Paquette, R J
    • Wright, P H
  • Publication Date: 1966-6

Subject/Index Terms

Filing Info

  • Accession Number: 00210350
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS, STATEDOT
  • Created Date: Nov 1 1994 12:00AM