CRITERIA FOR ASSESSING THE RESISTANCE TO DEFORMATION OF ASPHALT MIXES

KRITERIEN FUER DIE BEURTEILUNG DES VERFORMUNGSWIDERSTANDS VON ASPHALTMISCHUNGEN

THE STABILITY OF UNBOUND MINERAL AGGREGATE MIXTURES INCREASES WITH INCREASING INTERNAL FRICTION. THIS REACHES A MAXIMUM WHEN THE BULK DENSITY IS A MAXIMUM. THE CONNECTION BETWEEN DENSITY, INTERNAL FRICTION AND STABILITY APPLIES ALSO TO COMPACTED ASPHALT MIXES. FOR THIS REASON THEY ACHIEVE THEIR HIGHEST RESISTANCE TO DEFORMATION WHEN FOR A GIVEN COMPACTION ENERGY THE BINDER CONTENT IS CHOSEN SO AS TO MAKE THE APPARENT VOIDS CONTENT A MINIMUM. IN THE CASE OF LOW VOID MIXTURES FOR ROAD PAVEMENTS THIS IS ACHIEVED IF THE VOID CONTENT OF THE MARSHALL TEST SPECIMEN IS ABOUT 2% BY VOL. THIS CORRESPONDS TO A DEGREE OF IMPREGNATION (THAT IS THE RATIO OF BINDER VOLUME TO THE APPARENT VOID VOLUME) OF LESS THAN 85%. IN THE USA DEGREES OF IMPREGNATION BETWEEN 78 AND 82% ARE RECOMMENDED FOR ASPHALT CONCRETES. IN ORDER TO ACHIEVE SATISFACTORY LONG TERM ELASTICITY THE MINERAL AGGREGATE MIXTURE MUST HAVE SUFFICIENT VOID CONTENT TO ACCOMMODATE THE AMOUNT OF BINDER REQUIRED. THIS CAN BE ACHIEVED BY INCREASING THE PROPORTION OF CRUSHED STONE AND BY CAREFULLY SELECTING THE TYPE AND AMOUNT OF A SUITABLE FILLER. THE AUTHOR RECOMMENDS THE USE OF THE DEGREE OF IMPREGNATION IN RELATION TO THE APPARENT VOID CONTENT AS AN ADDITIONAL EVALUATION CRITERION. OF COURSE DURING THE TRIAL PERIOD THIS SHOULD NOT HAVE ANY EFFECT ON THE LEGAL BASIS OF THE CONTRACT CONDITIONS.

  • Authors:
    • Peffekoven, W
  • Publication Date: 1976

Language

  • German

Media Info

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Filing Info

  • Accession Number: 01293092
  • Record Type: Publication
  • Source Agency: Forschungsgesellschaft für Straßen- und Verkehrswesen (FGSV)
  • Files: ITRD
  • Created Date: Nov 21 2010 3:51AM