LOW TEMPERATURE MAXIMUM DEFORMABILITY OF ASPHALTS

THE LOW TEMPERATURE MECHANICAL PROPERTIES OF ASPHALTS WERE INVESTIGATED BECAUSE OF THE DETERIORATION EXHIBITED BY BITUMINOUS PAVEMENTS DURING, AND, OR SUBSEQUENT TO PERIODS OF LOW TEMPERATURE SERVICE. ATTRIBUTED TO THE MECHANICAL EFFECTS ARE THE LOW TEMPERATURE ELASTICITY AND VISCOSITY OF ASPHALTS. IT IS SHOWN THAT THE HIGH DEFORMATION RATE TRAFFIC-TYPE DEFORMATION IS NOT CRITICAL FOR ASPHALT- AGGREGATE MIXTURES BECAUSE: (1) THE MAGNITUDE OF THE HIGH RATE DEFORMATIONS IS RELATIVELY LARGE BEFORE BREAKS OCCUR, (2) ONLY A VERY SMALL RANGE OF DIFFERENCE AMONG ASPHALTS (FROM DIFFERENT CRUDE SOURCES) IN ADMIXTURE WITH AGGREGATE, (3) NO DIFFERENTIATION WAS NOTED BETWEEN DIFFERENT PENETRATION GRADES OF THE SAME ASPHALT, (4) THE EFFECT OF TEMPERATURE ON THIS TYPE OF DEFORMATION WAS RELATIVELY SMALL. THE LOW DEFORMATION RATE THERMAL EXPANSION TYPE OF DEFORMATION IS MORE CRITICAL FOR ASPHALTS BECAUSE: (1) FAILURES OCCUR AT LOWER MAGNITUDES OF DEFORMATION, (2) IT VARIES IN A LOGICAL MANNER WITH PENETRATION, AND (3) IT DISTINGUISHES BETWEEN ASPHALTS FROM DIFFERENT CRUDE SOURCES IN A MANNER CONSISTENT WITH SERVICE EXPERIENCE, AND (4) IT EXHIBITS A REASONABLE TEMPERATURE EFFECT AND SHOWS A GENERAL RELATIONSHIP TO THE TEMPERATURE SUSCEPTIBILITY OF THE ASPHALTS.

Subject/Index Terms

Filing Info

  • Accession Number: 00210853
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 6 1994 12:00AM