AN IMPROVED METHOD OF CHARACTERIZING ASPHALTIC BITUMENS WITH THE AIR OF THEIR MECHANICAL PROPERTIES

The aspects are described and the interrelations are discussed of the following mechanical properties: Fraas breaking point, penetration, softening point Ring and Ball, viscosity, and the stiffness modulus. Penetration is considered as a function of temperature and as a function of time. Viscosity at temperatures above the softening point are detailed and the relation between viscosity and penetration (equations show that they are related) are discussed. It is shown that the stiffness modulus deals with the total deformation of a bitumen whereas viscosity is a measure of the viscous flow only. It is concluded from the study that bitumens may be divided into 3 classes, each showing a specific type of behavior. Each class must be considered by itself because for each the minimum number of characteristic values required for a complete description is different. It is recommended that for characterization purposes, use be made of T 800 pen as the reference temperature and of PI (pen/pen) as the temperature susceptibility. These characteristic values belong to the same branch of a curve on the BTDC and thus form a consistent system for all classes of bitumen.

• Supplemental Notes:
  • Proceedings of the meeting held in Houston, Texas, February 1973.
• Corporate Authors:

  University of Minnesota, Minneapolis

  155 Experimental Engineering Building
  Minneapolis, MN  United States  55455
• Authors:
  • Heuckelom, W
• Conference:
  • Association of Asphalt Paving Technologists Proc
• Publication Date: 1973

Media Info

• Features: Figures; References;
• Pagination: p. 67-98
• Serial:
  • Volume: 42

Subject/Index Terms

• TRT Terms: Bitumen; Classification; Deformation; Fracture mechanics; Materials selection; Mechanical properties; Pendulum tests; Softening point; Stiffness; Temperature; Time; Viscosity
• Old TRIS Terms: Materials evaluation; Time factor
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00127325
• Record Type: Publication
• Files: TRIS
• Created Date: Dec 16 1975 12:00AM