REDUCTION IN TRANSVERSE PAVEMENT CRACKING BY USE OF SOFTER ASPHALT CEMENTS

TRANSVERSE PAVEMENT CRACKING IN CANADA IS CAUSED PRIMARILY BY LOW WINTER TEMPERATURES AND CAN BE DRAMATICALLY REDUCED OR ELIMINATED BY THE USE OF SOFTER GRADES OF ASPHALT CEMENT. EVIDENCE IS PROVIDED BY OBSERVATION AND PHOTOGRAPHS OF PAVEMENTS IN CANADA AND BY THE ANALYSIS OF PAVEMENT SAMPLES. SINCE SOFT ASPHALTS ARE COMPARABLE IN PRICE TO HARDER ASPHALT CEMENTS THERE SHOULD BE LITTLE OR NO INCREASE IN THE INITIAL INVESTMENT, WITH A SUBSTANTIAL SAVING IN MAINTENANCE COSTS. ASPHALT CEMENTS MUST ALSO PROVIDE PAVEMENTS WITH ENOUGH STABILITY FOR HOT WEATHER TRAFFIC, THUS SOUND JUDGEMENT IS REQUIRED WHEN DECIDING HOW SOFT AN ASPHALT CAN BE USED. BASED ON CONSIDERATIONS OF LOW TEMPERATURE TRANSVERSE PAVEMENT CRACKING, EVIDENCE IS PRESENTED THAT FIRMLY OPPOSES GRADING OF ASPHALT CEMENTS BY VISCOSITY AT 140 F AND SUPPORTS THEIR CONTINUED GRADING BY PENETRATION AT 77 F. /CGRA/

• Supplemental Notes:
  • Vol 13, pp 5-95, 32 FIG, 13 TAB, 21 PHOT
• Authors:
  • Mcleod, N W
• Publication Date: 1968-11

Media Info

• Serial:
  • Canadian Technical Asphalt Association, Proceeding
  • Publisher: POLYSCIENCE PUBLICATIONS INC.

Subject/Index Terms

• TRT Terms: Asphalt cement; Benefit cost analysis; Grading (Earthwork); Maintenance management; Pavement cracking; Reduction (Chemistry); Soil penetration test; Temperature; Transverse cracking; Viscosity
• Uncontrolled Terms: Grading; Maintenance costs
• Old TRIS Terms: Reduction
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00210584
• Record Type: Publication
• Source Agency: CANADIAN GOOD ROADS ASSOCIATION
• Files: TRIS
• Created Date: Apr 16 1970 12:00AM