DEVELOPMENTS IN HIGHWAY PAVEMENT ENGINEERING - 2. CHAPTER 4. ASSESSMENT OF PERFORMANCE AND OVERLAY DESIGN OF FLEXIBLE PAVEMENTS

The basic requirements of a system for strengthening roads are a rapid technique of measuring their structural condition and a design method for determining the timing and extent of the strengthening measures. The two main types of equipment for the measurement of structural condition of a road in terms of the deflection of its surface are described those which employ some form of dyanmic loading on a plate and those which utilise a rolling wheel load moving at creep speed. The development of the transport and Road Research Laboratory method for estimating the unexpired life of existing pavements and strengthening of roads with bituminous overlays is described, with emphasis being given to matching of overlay requirements to the varying structural conditions found along roads in need of strengthening. Case histories illustrating the validity of the method are presented. A description is also given of a different design approach, the shell method, in which pavement conditions are analysed using multi-layer elastic theory applied to deflections measured by a falling-weight loading technique. /Author/TRRL/

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  • Corporate Authors:

    Applied Science Publishers Limited

    22 Rippleside Commercial Estate, Ripple Road
    Barking, Essex,   England 
  • Authors:
    • Lister, N W
    • KENNEDY, C K
  • Publication Date: 1978

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Filing Info

  • Accession Number: 00194991
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Jul 11 1979 12:00AM