PHYSICAL PROPERTIES OF BINDER RECOVERED FROM SAND/SULPHUR/BITUMEN AND SAND/LIMESTONE FILLER/BITUMEN MIXES

The dominant physical change leading to reduced bitumen durability is related to excessive stiffening or hardening. Bituminous mixes treated with sulphur have been said to be more resistant to weathering particularly at low temperatures. This paper describes a four year research project on the effects of adding sulphur to bituminous mixes. Sand/sulphur/bitumen (SSB) mixes at different sand/sulphur ratios were cast using sand/limestone filler/bitumen (SLB) as a control. Specimens were flown to Jordan and exposed to local weathering conditions, the bitumen then extracted and tested for binder content, penetration, ring and ball softening point and viscosity. After 28 days the binder content of the SSB mixes showed a significant increase but after 6, 12, 18 and 24 months no further increases occurred. The SLB mix showed no change. The penetration of the binder recovered from SSB and SLB mixes showed significant decrease with weathering which varied with sulphur content. Ring and ball softening point increased with weathering with the highest sulphur content having the highest softening point. With SLB mixes softening point depended on the percentage of air voids. The hardness of the binder was also found to vary with depth but the higher the sulphur content the less the variation.

  • Corporate Authors:

    INSTITUTE OF ASPHALT TECHNOLOGY

    PAPER MEWS PLACE, 290 HIGH STREET
    DORKING, SURREY  United Kingdom  RH4 1QT

    INSTITUTE OF ASPHALT TECHNOLOGY

    PAPER MEWS PLACE, 290 HIGH STREET
    DORKING, SURREY  United Kingdom  RH4 1QT
  • Authors:
    • YOUSEF, M
    • Farouki, O T
  • Publication Date: 1990-11

Language

  • English

Media Info

  • Features: References;
  • Pagination: p. 30-33
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00609906
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Jun 30 1991 12:00AM