A STUDY OF VIBRATION PHENOMENA IN ASPHALTIC ROAD CONSTRUCTION

IT IS HYPOTHESIZED THAT THE FLEXURAL STRESSES SET UP BY MOVING TRAFFIC ULTIMATELY EXCEED THE STRENGTH OF THE MATERIALS, LEADING TO CRACK FORMATION. FLEXTURAL STRENGTH AFTER REPEATED LOADINGS AND FATIGUE PHENOMENA ARE INVESTIGATED. A VIBRATION GENERATOR IS DESCRIBED WHICH PRODUCES A WIDE VARIATION OF BOTH FREQUENCY AND AMPLITUDE OF FORCE APPLIED TO THE PAVEMENT STRUCTURE. METHODS OF DETERMINING PAVEMENT DEFLECTION AS A FUNCTION OF THE FORCE ACTING ON THE PAVEMENT AND MEASURING STRAINS IN THE PAVEMENT AND THE RATE OF PROPAGATION OF WAVES PRODUCED BY THE VIBRATION GENERATOR ARE PRESENTED. EXPERIMENTAL RESULTS INCLUDE SHEAR MODULUS OF PAVEMENT COMPONENT LAYERS, PAVEMENT DEFLECTION WITH AND WITHOUT ASPHALT SURFACE, PAVEMENT STIFFNESS, EFFECT OF THICKNESS OF BITUMINOUS BOUND LAYER, STRAIN MEASUREMENT UNDER THE VIBRATION MACHINE AND UNDER MOVING TRAFFIC. IT IS CONCLUDED THAT CRACKING OF ASPHALTIC ROAD CARPETS IS MAINLY DUE TO BENDING STRESSES EXCEEDING THE STRENGTH OF THE MATERIAL. STIFFNESS OF COMPLETED CONSTRUCTION CAN BE DESCRIBED BY A SINGLE VALUE, THE DYNAMIC LOAD PER UNIT OF DEFLECTION. IT IS POSSIBLE TO MEASURE THE DYNAMIC SHEAR MODULUS OF SUB-SOIL AND SUB-BASE IN SITES. A BITUMINOUS BOUND BASE HAS A VERY BENEFICIAL EFFECT ON THE STRAINS IN THE CARPET.

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Filing Info

  • Accession Number: 00206770
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 6 1994 12:00AM