VACUUM METHOD OF EXTRACTING ASPHALT FROM BITUMINOUS-AGGREGATE MIXTURES

THE VACUUM METHOD OF ASPHALTIC MIX EXTRACTIONS HAS BEEN COMPARED WITH THE CURRENTLY SPECIFIED CENTRIFUGE METHOD OF AASHO T-164. AREAS INVESTIGATED INCLUDE RELATIVE ACCURACY OF THE TWO METHODS, AMOUNT OF ASH CORRECTION NECESSARY WHEN USING DIFFERENT FILTER PAPERS FOR THE VACUUM METHOD, PROBABLE ERRORS (STANDARD DEVIATIONS), TESTING TIMES, AND EQUIPMENT COSTS. THE ACCURACY OBTAINED WITH THE VACUUM METHOD IS COMPARABLE TO THAT OF THE CENTRIFUGE METHOD. A RETENTION FACTOR WILL PROBABLY HAVE TO BE USED WITH ASPHALT EXTRACTIONS. WITH THE PROPER VACUUM FILTER PAPER, THE ASH CORRECTION IS CONSIDERABLY LESS THAN 0.1% ASPHALT AND FOR PRACTICAL PURPOSES CAN BE NEGLECTED. SOME ASPHALTIC MIXES WERE FOUND TO PLUG THE FILTER, IN WHICH CASE A FILTERING AID, CELITE, ELIMINATED THE PROBLEM. A STATISTICAL ANALYSIS PERFORMED ON DATA FROM ONE AND TWO OPERATORS SHOWED STANDARD DEVIATIONS OF ABOUT 0.15% ASPHALT CONTENT WITH THE VACUUM EXTRACTION PROCEDURE. /AUTHOR/

  • Supplemental Notes:
    • 14 Pp, 2 FiG, 3 TAB, 3 TAB, 4 PHOT, 4 REF
  • Corporate Authors:

    Alaska Department of Highways

    Pouch Z
    Juneau, AK  USA  99801
  • Authors:
    • Hamilton, R A
    • Lloyd, C J
  • Publication Date: 1970-6

Subject/Index Terms

Filing Info

  • Accession Number: 00211567
  • Record Type: Publication
  • Files: TRIS, STATEDOT
  • Created Date: Mar 20 2003 12:00AM