The report presents the results of a study designed to develop polymer-modified road tars based on the addition of poly (methylmethacrylate) (pmma) to low-temperature tar. The method so described was to add scrap "perspex" turnings and selected commercial grades of methylmethacrylate copolymers and homopolymers to a low-temperature road-tar from Coalite and Chemical Products Ltd. It was concluded that "perspex" turnings and the selected "diakon" copolymer grades could not be satisfactorily incorporated in the low-temperature tar. Two homopolymers are reported as giving good blends; a tar containing one per cent acrylic granules dp 300 was shown to exhibit a high degree of elasticity and improved resistance to both low-temperatures and impact. At pmma concentrations of up to one per cent it was observed that the modified tar could be sprayed through a standard ashurst jet over the temperature range 120-145 deg C. A full-scale surface-dressing trial using tar containing acrylic granules dp 300 is described, carried out in September 1977 over approximately 1.5 km of the B6013 south of Higham Village in Derbyshire. The polymer-modified binder was prepared on the large scale with only minor difficulty, and was successfully sprayed through a normal spray-bar. It is indicated that the surface dressing has so far given good performance in service. /TRRL/

  • Corporate Authors:

    British Carbonization Research Association

    Carbonization Research Center
    Chesterfield, Derbyshire S4Z6J5,   England 
  • Publication Date: 1978-7

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 21 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00195517
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Report/Paper Numbers: Research Rpt. 50 Monograph
  • Files: ITRD, TRIS
  • Created Date: Aug 15 1979 12:00AM