MODIFIED BITUMENS FOR ROLLED ASPHALT

The article discusses the performance limitations of rolled asphalt made according to BS 594. The hot summers of 1975 and 1976 have led to some severe rutting of rolled asphalt. Factors affecting the stability of gap-graded mixes have been investigated by laboratory and field trials. A number of methods are available to improve the resistance to permanent deformation, the article deals with the simplest of these - the use of binders with reduced temperature susceptibility. Relative viscous strain and deformation are examined as a function of temperature and penetration index (pi). The effect of increasing the value of pi on other aspects of performance is discussed. It is recommended that a pi of about +2 could be used as a means of producing rolled asphalt with a high resistance to rutting. /TRRL/

• Corporate Authors:

  Embankment Press Limited

  Embankment House, 3 Caledonian Road
  London,   England 
• Authors:
  • Lucas, A G
• Publication Date: 1976-8

Language

• English

Media Info

• Features: Figures;
• Pagination: p. 4-5
• Serial:
  • Highways and Road Construction International
  • Volume: 44
  • Issue Number: 1800
  • Publisher: Embankment Press

Subject/Index Terms

• TRT Terms: Binders; Bitumen; Deformation; Gap graded aggregates; Gap grading; Pendulum tests; Rolled asphalt; Rutting; Stability (Mechanics); Standards; Temperature; Viscosity
• Geographic Terms: United Kingdom
• Old TRIS Terms: Tracking (Wheel)
• ITRD Terms: 4963: Bitumen; 5595: Deformation; 4597: Gap graded aggregate; 6285: Penetration; 4989: Rolled asphalt; 3081: Rutting (wheel); 187: Specification (standard); 5930: Stability; 6722: Temperature; 8119: United Kingdom; 5936: Viscosity
• Subject Areas: Highways; Materials; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 00145356
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: Apr 13 1977 12:00AM