DESIGN PARAMETERS FOR LAYERED PAVEMENT SYSTEMS

THE LAYERED PAVEMENT METHOD FOR FLEXIBLE PAVEMENT DESIGN PRESENTED BY BURMISTER WAS ADOPTED BY THE BUREAU OF YARDS AND DOCKS FOR AIRFIELD PAVEMENT DESIGN. STUDIES WERE CONDUCTED TO PROVIDE VALUES FOR THE DESIGN PARAMETERS: MODULUS OF ELASTICITY, POISSON'S RATIO, THE RANGE IN THE ELASTIC MODULUS OF PAVEMENT MATERIALS, AND THE INFLUENCE OF VARIABLES AS DEPTH OF PAVEMENT, DENSITY AND THE EFFECT OF REPEATED LOADING. THE APPARATUS AND MATERIALS USED ARE DESCRIBED AND THE PROCEDURES AND TESTS PERFORMED OUTLINED. THEORETICAL ANALYSES WERE CONDUCTED TO PRODUCE THE SETTLEMENT INFLUENCE CURVES WHICH CORRESPOND TO THE BOUNDARY CONDITIONS OF THE MECHANICAL SUBGRADE. SELECT BASE, CRUSHED ROCK AND SAND WERE USED TO CONSTRUCT TWO-AND-THREE-LAYERED SYSTEMS. TESTS INDICATE THAT THE MODULUS OF ELASTICITY IS DEPENDENT UPON THE DEPTH OF THE BASE AND THAT THIN BASES (8- INCHES) IN TWO LAYERED SYSTEMS DO NOT PERFORM AS EXPECTED. THESE THIN BASES UNDERGO EXCESSIVE SETTLEMENTS AND CRACKING AND RUTTING OF OVERLYING WEARING SURFACES WILL BE IMMINENT. IT IS OBSERVED THAT COMPACTION OF THE BASE IS NOT THE SOLE CRITERIA FOR STABILITY AND DEVELOPMENT OF A MECHANICAL BOND IN THE FORM OF PARTICLE INTERLOCK IS ESSENTIAL. THE INCREASE IN MODULUS WITH DEPTH CAN BE OF SIGNIFICANCE WHEN DESIGNING PAVEMENTS AS IT WILL HAVE A FAVORABLE INFLUENCE IN REDUCING THE SUBGRADE PRESSURE. THE INCREASE IN THE MODULI VALUES WITH DEFLECTION IS ATTRIBUTED TO MOBILIZED SHEAR STRENGTH AND NOT TO INCREASED DENSITY. REPEATED LOADING HAS A PRESTRESSING EFFECT, INCREASING THE MECHANICAL BOND.

  • Supplemental Notes:
    • Vol 34, pp 520-537, 3 FIG, 5 TAB, 15 REF
  • Authors:
    • Nielsen, J P
    • Lowe, R J
  • Conference:
  • Publication Date: 1965-2

Subject/Index Terms

Filing Info

  • Accession Number: 00205569
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 24 1994 12:00AM