THE IMPROVEMENT OF ROAD BITUMEN WITH OLD RUBBER

VERGUETUNG VON STRASSENBAUBITUMEN MIT ALTGUMMI

THE AUTHOR REPORTS ON INVESTIGATIONS INTO THE USE OF BINDER-MIXES HAVING 87.5% BITUMEN 200 AND 12.5% RUBBER-CONCENTRATE AND BITUMEN/SAND OR BITUMEN/FILLER MIXTURES WITH THE ADDITION OF OLD RUBBER CHIPS. THE BITUMEN AND OLD RUBBER WERE MIXED FOR 1 HOUR OR 30 MINUTES AT 425 K AND STORED FOR 2 HOURS AT THE SAME TEMPERATURE. AS AN EXPERIMENT AN ADDITION OF 0.75% SULPHUR AND 0.03% HEXAMETHYLENE-TETRAMINE WAS MADE TO ACCELERATE THE VULCANISATION PROCESS. FROM THE MEASURED VALUES FOR PENETRATION, SOFTENING POINT RING AND BALL, BREAKING POINT, DUCTILITY AND PENETRATION-INDEX NO QUALITATIVE IMPROVEMENT OF THE BITUMENS QUALITIES WERE RECOGNISABLE. A MORE FAVOURABLE INFLUENCE OF THE ADDITION OF RUBBER TO THE BEHAVIOUR OF BITUMEN AND BITUMINOUS MORTARS COULD BE DEMONSTRATED BY TESTING FOR DEPTH OF IMPACT IMPRESSION, NUMBER OF BLOWS, STRENGTH OF ADHESION AND DEFORMATION AND ELASTICITY OF THE BITUMEN/SAND OR BITUMEN/FILLER MIXES. IN THIS CONNECTION IT WAS ESTABLISHED THAT BECAUSE OF THE LINKING OF THE RUBBER WITH SULPHUR THERE WAS AN IMPROVEMENT IN THE DIMENSIONAL STABILITY OF THE MIX AND BECAUSE OF THE FINE LIMESTONE FILLER THE INFLUENCE OF THE RUBBER APPEARED GREATER. THE TOTAL DEFORMATION AND THE RESIDUAL DEFORMATION WAS LESS WHEN, INSTEAD OF B 200, A BITUMEN/RUBBER MIXTURE WAS USED. IN MANUFACTURING THE RUBBER-CONCENTRATE FROM OLD RUBBER HIGHLY AROMATIC BY-PRODUCTS FROM PETRO-CHEMICAL AND OIL OPERATIONS CAN BE USED AS SOLVENTS.

  • Authors:
    • LIEBISCH, G
    • Scholze, S
  • Publication Date: 1978-10

Language

  • German

Media Info

  • Pagination: 349-52
  • Serial:
    • Strasse
    • Volume: 18
    • Issue Number: 10/11

Subject/Index Terms

Filing Info

  • Accession Number: 01289395
  • Record Type: Publication
  • Source Agency: Forschungsgesellschaft für Straßen- und Verkehrswesen (FGSV)
  • Files: ITRD
  • Created Date: Nov 21 2010 1:45AM