OBSERVATIONS ON THE RHEOLOGY AND FRACTURE OF BITUMENS AND ASPHALT MIXES

THE TWO ESSENTIAL FACTORS IN THE CHARACTERISTICS OF ASPHALT AS A BUILDING MATERIAL ARE EXAMINED TO FIND A SIMPLE SYSTEM OF PARAMETERS WHICH COULD REPLACE THE INDIVIDUAL EFFECTS OF ORIGIN, HARDNESS, TEMPERATURE SUSCEPTIBILITY, TEMPERATURE UNLOADING, DURATION OF THE LOADING PERIOD, AND/ OR RATE OF LOADING OF THE PLAIN ASPHALT CEMENT (ASPHALTIC BITUMEN). THESE TWO FACTORS ARE: (1) THE RESISTANCE OF DEFORMATION (RHEOLOGY) AND (2) THE PERMISSIBLE DEFORMATION (FRACTURE). ATTENTION IS FOCUSED ON PLAIN ASPHALT CEMENT. IT IS DEMONSTRATED THAT VAN DER POEL'S STIFFNESS CONCEPT PROVIDES A VALUABLE MEANS OF SIMPLIFYING THE DESCRIPTION OF NOT ONLY RHEOLOGICAL, BUT ALSO FRACTURE PROPERTIES OF ASPHALT CEMENTS AND ASPHALT MIXES. THE USE OF THE STIFFNESS MODULUS IS USEFUL IN CONNECTION WITH DESIGN CALCULATIONS, AS IT EXPRESSES THE RESISTANCE TO DEFORMATION OF ASPHALT MIXES IN RATIONAL QUANTITIES. THE MODULUS OF ASPHALT CEMENT IS A MEASURE OF THE RHEOLOGICAL CONDITION OF THE BITUMEN, ON WHICH THE FRACTURE PROPERTIES DEPEND. THE EFFECTIVE TEMPERATURE AND LOADING TIME ON THE FRACTURE PROPERTIES OF ROAD BITUMENS OF VARIOUS GRADE AND ORIGIN IS THUS CONDENSED IN THE STIFFNESS AS A SINGLE PARAMETER. PARAMETERS FOR THE FRACTURE PROPERTIES OF MIXES CAN BE SEPARATED INTO THE STIFFNESS OF THE ASPHALT CEMENT AND A MIX FACTOR WHICH IS INDEPENDENT OF VARIABLES, BUT DEPENDENT ON THE PROPORTION OF ASPHALT CEMENT, GRADING OF THE MINERALS AND COMPACTION OF THE MIX. A FURTHER STUDY OF THESE VARIABLES CAN BE SIMPLIFIED BY DETERMINING THE VALUE OF THE MIX FACTOR ONLY, SO THAT MUCH LABORATORY EFFORT CAN BE SAVED.

• Supplemental Notes:
  • Vol 35, pp 358-399, 24 FIG, 5 TAB, 9 REF
• Authors:
  • Heukelom, W
• Conference:
  • Assoc Asphalt Paving Technol Proc
• Publication Date: 1966-2

Subject/Index Terms

• TRT Terms: Asphalt; Asphalt cement; Bitumen; Bituminous mixtures; Deformation; Fracture mechanics; Loading and unloading; Mix design; Rheological properties; Stiffness; Temperature
• Uncontrolled Terms: Fracture
• Old TRIS Terms: Loading time
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00210786
• Record Type: Publication
• Files: TRIS
• Created Date: May 6 1994 12:00AM