VISCOSITY PENETRATION CONSIDERATIONS IN RELATION TO ASPHALT SPECIFICATIONS

TESTS RELATED TO RHEOLOGICAL BEHAVIOR MAY BE CONSIDERED AS THE MOST IMPORTANT PART OF AN ASPHALT SPECIFICATION. THE RHEOLOGICAL CHARACTERISTIC OR VISCOSITY OF AN ASPHALT DETERMINES THE STORAGE TEMPERATURE OF THE ASPHALT AT A PLANT; SUITABLE AND PROPER MIXING TEMPERATURE IN THE PUGMILL; TEMPERATURE FOR PLACING AND COMPACTING THE MIX; THE SIZE, TYPE, AND USE OF COMPACTION EQUIPMENT; AND BEHAVIOR OF THE MIX UNDER IN-SERVICE TEMPERATURE CONDITIONS, ESPECIALLY DURING FREEZING IN THE FALL AND THAWING IN THE SPRING. THE RHEOLOGICAL BEHAVIOR OF THE ASPHALT MUST, THEREFORE, BE KNOWN OVER A TEMPERATURE RANGE OF ABOUT 275 DEGREES F., FROM PLANT-MIXING TEMPERATURES TO THE TEMPERATURE AT WHICH AN ASPHALT CEASES TO BEHAVE AS A VISCOUS MATERIAL AND ASSUMES A SOLID STATE, A TEMPERATURE SOMETIMES REFERRED TO AS THE GLASS TRANSITION POINT. SUCH KNOWLEDGE WILL LEAD TO A BETTER UNDERSTANDING OF THE BEHAVIOR OF ASPHALTS DURING CONSTRUCTION AND SERVICE AND WILL ULTIMATELY RESULT IN SPECIFYING ASPHALTS THAT, ON THE BASIS OF THEIR RHEOLOGICAL CHARACTERISTICS, PERFORM THE BEST. /RATAOC/

  • Corporate Authors:

    Saskatchewan Dept Hwys, Regina /Canada

    ,    
  • Authors:
    • Winnitoy, W E
  • Publication Date: 1970-9

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 27 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00210596
  • Record Type: Publication
  • Source Agency: Roads & Transportation Assoc /Canada
  • Report/Paper Numbers: Tech Rpt 12
  • Files: TRIS, ATRI
  • Created Date: Sep 6 1971 12:00AM