TECHNOLOGICAL PREPARATION OF HIGHWAY ASPHALTS FROM PETROLEUMS OF VARIOUS GROUPS /IN RUSSIAN/

ALL U.S.S.R. CRUDES HAVE A VERY LOW RATIO OF ASPHALTENES (A) TO RESINS (R) (A/R LESS THAN 0.4) WHICH REMAINS ALMOST UNCHANGED ON DISTRIBUTION OF DEASPHALTIZATION. FOR THIS REASON THE RESIDUE HAS TO BE CONCENTRATED TO A HIGH DEGREE TO OBTAIN AN ASPHALT (TO BE USED FOR ROAD BUILDING) WITH THE REQUIRED SOFTENING POINT. AS A RESULT THE ASPHALT HAS A LOW FROST RESISTANCE. A/R RATIO CAN BE INCREASED BY OXIDATION OF ASPHALTS WITH AIR AT HIGH TEMPERATURES. DURING OXIDATION THE OIL CONTENT (0) DROPS ABRUPTLY, WHILE THE RESIN CONTENT DOES NOT CHANGE GREATLY. TO PRODUCE OXIDIZED ASPHALT FROM CRUDES OF GROUP I, A STRAIGHT-RUN DISTRIBUTION RESIDUAL TAR FRACTION WITH A HIGH OIL CONTENT CAN BE USED, SO THAT THE REDUCTION OF THE OIL CONTENT IN OXIDATION IS COMPENSATED. TYPICAL TAR FRACTIONS OF THIS TYPE, OBTAINED BY CONCENTRATION OF THE CRUDES TO 50-60%, HAD THE FOLLOWING CHARACTERISTICS: A 4-7, R 30-33%; A/R LESS THAN 0.2, (A + R) /0 = 0.62. TO ASPHALTS OBTAINED BY OXIDATION OF THESE FRACTIONS, SURFACE-ACTIVE COMPOUNDS WERE ADDED TO INCREASE ADHESION TO INORGANIC MATERIALS USED IN ROAD BUILDING. THE COHESION WAS IMPROVED BY ADDING DISTRIBUTION RESIDUES FROM SYNTHETIC FATTY ACIDS PRODUCTION. THE FROST RESISTANCE OF THE RESULTING ASPHALTS (A/R = 0.5-0.8, (A + R)0 = 0.84-0.92) WAS GOOD BECAUSE OF THE HIGH OIL CONTENT (0 = 46-53%). ASPHALTS FROM CRUDES OF GROUP II ARE BEST PRODUCED BY COMBINED OXIDATION AND COMPOUNDING. A HEAVY PRODUCT WITH A HIGH RESIN CONTENT (E.G. R = 39%) IS OXIDIZED TO THE DESIRED VALUE OF A/R AND THEN DILUTED WITH A LIGHT PRODUCT HAVING A HIGH OIL CONTENT. /LCPC(A)/RRL/

  • Supplemental Notes:
    • No 8, pp 170-181
  • Corporate Authors:

    Nauch-issled Inst Pererab Nefti

    ,    
  • Authors:
    • Akmetova, R S
    • Fryazinov, V V
  • Publication Date: 1968

Subject/Index Terms

Filing Info

  • Accession Number: 00211120
  • Record Type: Publication
  • Source Agency: Road Research Laboratory /UK
  • Files: TRIS
  • Created Date: Jun 29 1971 12:00AM