THE DEVELOPMENT OF ROADHOG, A FLEXIBLE PAVEMENT OVERLAY DESIGN PROCEDURE. NDT OVERLAY DESIGN. FINAL REPORT

A flexible pavement overlay thickness design procedure was developed. The procedure follows the AASHTO structural number approach to flexible pavement design and uses the structural deficiency concept in selecting the overlay thickness. The subgrade resilient modulus (M sub r) and existing pavement structural capacity (effective structural number or SN sub eff) are determined from NDT data obtained using a falling weight deflectometer. M sub r is calculated using the deflection measured 3 ft from the FWD center of loading. This method of calculation is based on ILLIPAVE finite element pavement analyses and was selected following an evaluation of various available NDT backcalculation methods. SN sub eff is determined from the difference between the deflections at the center of loading and the deflection at a distance from the center equal to the total pavement thickness. The SN sub eff determination method was developed under this study. The complete procedure is programmed for use on an IBM PC, XT, AT, or any compatible system having at least one floppy disk drive and a minimum of 384K of available RAM. The program is user friendly and runs interactively. It is menu-driven and features on-line help facilities.

Media Info

  • Features: Figures; References; Tables;
  • Pagination: v.p.

Subject/Index Terms

Filing Info

  • Accession Number: 00622303
  • Record Type: Publication
  • Report/Paper Numbers: FHWA/AR-91/003, UAF-AHTRC-90-001
  • Contract Numbers: TRC-8705
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: May 31 1996 12:00AM