DESIGN PROCEDURES FOR FLEXIBLE AND BITUMINOUS OVERLAYS

THE FOLLOWING COMMENTS RELATIVE TO OVERLAY DESIGN WERE EXTRACTED FROM THE FAA BROCHURE FOR INCLUSION IN THIS SUMMARY REPORT. DESIGN PROCEDURES ARE SUGGESTED FOR FLEXIBLE, BITUMINOUS AND CONCRETE OVERLAYS IN THE FAA MANUAL, HOWEVER, THE CONCRETE OVERLAYS ARE NOT HEREIN DESCRIBED DUE TO THEIR LIMITED USE. THE PRELIMINARY DESIGN INFORMATION REQUIRED BEFORE THE ACTUAL DESIGNS CAN BE MADE INCLUDE THE FOLLOWING' /1/ DETERMINATION OF THE SOIL GROUP AND SUBGRADE CLASS OF SOIL UNDERLYING THE EXISTING PAVEMENT BASED ON THE FAA CLASSIFICATION PROCEDURE, /2/ DETERMINATION OF THE ACTUAL THICKNESS OF EACH LAYER OF THE EXISTING PAVEMENT, /3/ BASED ON THE TYPE OVERLAY CONTEMPLATED, A DETERMINATION MUST BE MADE OF THE PAVEMENT THICKNESS REQUIRED FOR THE WHEEL LOADING AND SUBGRADE CLASS UNDER CONSIDERATION. AFTER THIS INFORMATION HAS BEEN ASSEMBLED, IF IT IS A FLEXIBLE OR BITUMINOUS OVERLAY TO BE APPLIED TO EITHER A FLEXIBLE OR RIGID PAVEMENT, THE FOLLOWING GENERAL CRITERIA MUST BE FOLLOWED' /1/ SUBBASE COURSES WILL NOT BE USED IN PAVEMENT OVERLAYS, /2/ NONBITUMINOUS BASE COURSES SHALL CONSIST OF CRUSHED MATERIAL, /3/ A PORTION OF THE THICKNESS OF A BITUMINOUS OVERLAY MAY CONSIST OF PENETRATION MACADAM, /4/ BITUMINOUS OVERLAYS SHALL HAVE A MINIMUM THICKNESS OF 3 INCHES, /5/ BITUMINOUS OVERLAYS GREATER THAN 3 INCHES THICK MAY BE PLANNED FOR STAGE CONSTRUCTION, /6/ ALL MATERIALS MUST COMPLY WITH FAA SPECIFICATIONS FOR BASE COURSE OF SURFACE COURSE. FOLLOWING THESE SIX CRITERIA THE DESIGN MAY BE MADE BY ONE OF TWO PROCEDURES' /1/ FLEXIBLE AND BITUMINOUS OVERLAYS ON EXISTING FLEXIBLE PAVEMENTS, AND /2/ FLEXIBLE AND BITUMINOUS OVERLAYS ON RIGID PAVEMENTS. THESE DESIGN PROCEDURES ARE OUTLINED. THE ASPHALT INSTITUTE PROCEDURE FOR OVERLAY PAVEMENTS RATHER THAN COMPOSITE PAVEMENTS TO STRENGTHEN EXISTING ASPHALT PAVEMENTS AND EXISTING RIGID PAVEMENTS ARE PRESENTED. REFERENCES' ASPHALT PAVING, FEDERAL AVIATION AGENCY, NOV. 1962 STANDARD SPECIFICATIONS FOR CONSTRUCTION OF AIRPORTS, FEDERAL AVIATION AGENCY.

Media Info

  • Media Type: Print
  • Features: Figures; Tables;
  • Pagination: pp 31-38
  • Monograph Title: Composite pavement design
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00210264
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Nov 18 1994 12:00AM