SPRAYING CHARACTERISTICS OF A NITRILE-RUBBER-MODIFIED LOW-TEMPERATURE ROAD TAR FOR SURFACE-DRESSING APPLICATIONS

This report determines the temperature and pressure ranges over which a coalite low-temperature tar modified by the addition of nitrile rubber may be sprayed from conventional road surface dressing equipment. The laboratory's spray test unit fitted with a single 4.76 mm ashurst jet was used to determine the binder distribution over as wide a range oftemperature and pressure as practicable. The 42 evt tar, containing 1.6 per cent of the preferred grade of nitrile rubber, could be sprayed satisfactorily under the pressure and temperature conditions normal for this viscosity grade. Signs of the onset of poor distribution were detected at the lowest temperature and pressure, and it is recommended that the minimum spraying temperature for each grade of this rubberized tar be increased by 5 deg C. (TRRL)

• Corporate Authors:

  British Carbonization Research Association

  Carbonization Research Center
  Chesterfield, Derbyshire S4Z6J5,   England 
• Publication Date: 1980-7

Language

• English

Media Info

• Features: Figures; References;
• Pagination: 9 p.

Subject/Index Terms

• TRT Terms: Binders; Equipment; Low temperature; Physical distribution; Pressure; Rubber; Seal coats; Sprayers; Spreading; Tar; Temperature; Viscosity
• Uncontrolled Terms: Spraying
• Subject Areas: Construction; Freight Transportation; Highways; Materials; I31: Bituminous Binders and Materials; I52: Construction of Pavements and Surfacings;

Filing Info

• Accession Number: 00335241
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Report/Paper Numbers: Rpt. 83 Monograph
• Files: ITRD, TRIS
• Created Date: Oct 28 1981 12:00AM