QUALITY CONTROL OF ASPHALTIC CONCRETE BY ACOUSTIC METHODS

THE AUTHORS DESCRIBE THE APPLICATION, STUDIED AT THE DORNII, OF ACOUSTIC METHODS /MEASUREMENT OF SPEED OF ULTRASONIC WAVES/ FOR THE QUALITY CONTROL OF ASPHALTIC CONCRETE, AT THE POINT WHEN THIS IS USED ON THE ROAD OR AERODROME-CONTROL NOT POSSIBLE USING TRADITIONAL PROCESSES. A CORRELATION HAS BEEN FOUND EXPERIMENTALLY BETWEEN DEGREE OF COMPACTION, SPEED OF SOUND IN THE MATERIAL AND ITS TEMPERATURE /PROPORTIONALITY BETWEEN TEMPERATURE ON THE ONE HAND AND THE HYPERBDIC TANGENT OF A MULTIPLE OF THE 4TH POWER OF THE SPEED OF PROPAGATION ON THE OTHER, VERY LITTLE INFORMATION BEING GIVEN ON HOW TO OBTAIN THE CONSTANT COEFFICIENTS/. THIS CORRELATION ENABLES INDIRECT AND IMMEDIATE MEASUREMENTS OF COMPACTION TO BE MADE WITH A PRECISION OF 1%. TRANSFORMATION OF EXPERIMENTAL DATA IS MADE EASIER BY A COMPACT BATTERY OPERATED TRANSISTORISED COMPUTER , WHICH CAN BE PLACED IN THE COMPACTING WORKSHOP AND WHICH CAN FORM A LINK IN THE AUTOMATION OF THE OPERATION. THIS HAS SHOWN IN PARTICULAR A MAXIMUM ENERGY OF COMPACTION FOR ASPHALTIC CONCRETES /EXCEPT FOR THE FINEST/. BEYOND THIS POINT, THERE IS FRAGMENTATION OF THE GRAINS OF THE MINERAL STRUCTURE WHICH DECREASES THE ULTRASONIC PROPAGATION SPEED AND THIS IN TURN MODIFIES THE STRUCTURAL MECHANICAL PROPERTIES. /RRL/LCPC/

  • Supplemental Notes:
    • No 3, pp 8-10, 3 FIG, 10 REF
  • Authors:
    • Zascuk IV
    • Nefedova, E F
  • Publication Date: 1966

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  • Accession Number: 00210511
  • Record Type: Publication
  • Source Agency: Road Research Laboratory /UK
  • Files: TRIS
  • Created Date: Jun 26 1994 12:00AM