A STUDY OF THE EFFECT OF DEVIATION IN ASPHALT CONTENT AND GRADATION FROM JOB-MIX VALUES IN HOT MIXTURES

A LABORATORY STUDY WAS PERFORMED ON HOT BITUMINOUS MIXTURES TO DETERMINE IF ASPHALT IS ABSORBED INTO THE AGGREGATES OF THESE MIXTURES THAT IS NOT RECOVERABLE BY THE REFLUX EXTRACTION PROCEDURE. AGGREGATES FROM TWO GEOLOGICAL SOURCES, AN IGNEOUS-SANDSTONE GRAVEL AND A CRUSHED DOLOMITE, WERE USED. SPECIFIC AMOUNTS OF AGGREGATE AND ASPHALT CEMENT WERE MIXED, CURED FOR FOUR DAYS, AND THEN EXTRACTED. DIFFERENCES IN THE APPARENT ASPHALT CONTENT OF MIXTURES BASED ON EXTRACTION TESTS AND THE KNOWN CONTENT BASED ON WEIGHTS OF THE MIXED MATERIALS PROVIDED A MEASURE OF THE AMOUNT OF ASPHALT NOT RECOVERABLE BY MEANS OF EXTRACTION. ALTHOUGH THE DATA OF THIS STUDY ARE QUITE LIMITED, IT CAN BE CONCLUDED THAT SOME AGGREGATE TYPES MAY ABSORB ASPHALT IN HOT-BITUMINOUS MIXTURES WHICH IS NOT RECOVERED IN AN EXTRACTION TEST AND CAN RESULT IN INDICATED ASPHALT CONTENT OF THE MIXTURE IN EXCESS OF TOLERANCE LIMITS NOW IMPOSED BY SPECIFICATIONS FOR CONTROL OF ASPHALT CONTENT AT THE MIXING PLANT. /AUTHOR/

  • Supplemental Notes:
    • Hpr-1/3/ BpR-4, STATE-906
  • Corporate Authors:

    WISCONSIN STATE HIGHWAY COMMISSION

    MADISON, WI  United States 
  • Authors:
    • Dunn, K H
  • Publication Date: 1967

Subject/Index Terms

Filing Info

  • Accession Number: 00210376
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS, STATEDOT
  • Created Date: Jul 28 1994 12:00AM