THE DEFORMATION CHARACTERISTICS OF SAND-BITUMEN MIXTURES UNDER CONSTANT COMPRESSIVE STRESSES

SOME FACTORS WHICH AFFECT THE RHEOLOGICAL BEHAVIOR OF SAND-BITUMEN MIXTURES ARE DESCRIBED. THESE INCLUDE LEVEL OF STRESS, TIME OF LOADING, DENSITY, BITUMEN CONTENT AND TYPE OF BITUMEN. THREE PARAMETERS, VIZ., VISCOSITY, MODULUS OF RECOVERY, AND STIFFNESS, ARE USED TO DESCRIBE THE RHEOLOGICAL BEHAVIOR OF BOTH THE BITUMENS AND THE SAND-BITUMEN MIXTURES. A HYPOTHESIS IS POSTULATED THAT TWO DIFFERENT TYPES OF DEFORMATION EXIST IN A SAND-BITUMEN MIXTURE: ONE STRENGTHENS THE MIXTURE AND PREDOMINATES AT LOW LEVELS OF STRESS OF SHORT LOADING TIMES; THE OTHER WEAKENS THE MIXTURE AND PREDOMINATES AT HIGH LEVELS OF STRESS AND LONG LOADING TIMES. THIS HYPOTHESIS CAN BE USED NOT ONLY TO EXPLAIN MANY RHEOLOGICAL PHENOMENA BUT ALSO TO INTRODUCE A NEW CONCEPT IN PREDICTING THE CREEP BEHAVIOR OF SAND-BITUMEN MIXTURES. /LCPC(A)/RRL/

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Filing Info

  • Accession Number: 00211035
  • Record Type: Publication
  • Source Agency: Road Research Laboratory /UK
  • Files: TRIS
  • Created Date: Jun 11 1971 12:00AM