An account is given of the development of PVC/TAR for use in road maintenance in Southern Africa. The nature of polyvinyl chloride and its effects on the properties of coke-oven tar are described. Procedures for preparing PVC/TAR blends and some practical aspects of the construction of surface treatments with this binder are mentioned. Promising results have been given by low-volatile PVC/TAR blends. The oldest, most successful sections were laid in October 1968 and are expected to give useful service. The oldest surviving full-scale work was laid in February 1969. Although the prime objective of adding PVC is to improve the durability of coke-oven tar, it is clear that PVC/TAR has a number of additional advantages such as reduction in initial whip-off with a consequent reduction in windscreen damage due to flying stones. Certain minor precautions are necessary in storage and handling. And it is shown that low-volatile blends are more resistant to thermal degradation of the PVC. There is a need to develop a PVC/TAR blend which can be applied successfully under winter conditions on the Highveld and to determine optimum construction techniques in using this binder. In many parts of Southern Africa PVC/TAR should be substantially cheaper than bitumen and only slightly more expensive than unmodified tar. /Author/TRRL/

  • Availability:
  • Corporate Authors:

    South African Institute of Civil Engineers

    P.O. Box 1187, 75 Marshall Street
    Johannesburg,   South Africa 
  • Authors:
    • Jamieson, I L
  • Publication Date: 1973-10

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: p. 265-271
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00082749
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Jul 24 1975 12:00AM