NOTES ON SEMI-AUTOMATIC DEVICES FOR THE MEASUREMENT OF ROAD SURFACE DEFLECTION AND CURVATURE BETWEEN THE DUAL WHEELS OF A TRUCK

AT THE REQUEST OF SOUTH AFRICAN ROAD AUTHORITIES, A PRELIMINARY STUDY HAS BEEN MADE OF POSSIBLE SYSTEMS FOR SEMI-AUTOMATIC MEASUREMENTS OF DEFLECTION AND CURAVTURE OVER LONG LENGTHS OF ROAD. THE CALIFORNIA DEFLECTOMETER IS COMPLEX AND VERY EXPENSIVE, AND THE ACCURACY OF THE FRENCH LACROIX DEFLECTOGRAPH IS IN DOUBT. ON THE BASIS OF A LITERATURE REVIEW AND TESTS ON VARIOUS TYPES OF ROAD CONSTRUCTION IN NATAL, IN WHICH SIGNIFICANT DEFLECTIONS OF THE ROAD SURFACE WERE MEASURED AS FAR AS 13 OR 14 FEET FROM TRUCK WHEELS, IT IS FELT THAT THE CONFIGURATION OF A SATISFACTORY INSTRUMENT MUST BE SUCH THAT NO INACCURACIES ARE INTRODUCED BY DEFLECTIONS OCCURRING UP TO 10 FEET FROM THE TRUCK WHEELS. NO METHOD OF CONSTRUCTING A SIMPLE AUTOMATIC DEVICE MEETING THIS CRITERION HAS BEEN CONCEIVED. A SIMPLE SEMI-SCALE PROTOTYPE HAS BEEN CONSTRUCTED WHICH PERFORMED IN A PROMISING MANNER AND COULD BE DEVELOPED INTO A SUITABLE DEFLECTOMETER IF THE ABOVE CRITERION WERE RELAXED AND LESS ACCURATE DEFLECTION MEASUREMENTS ACCEPTED, OR IF CURVATURE MEASUREMENTS ONLY WERE REQUIRED. /AUTHOR/

• Supplemental Notes:
  • Rs/1/67, 18 PP, 4 FIG, 2 TAB, 3 PHOT, 8 REF, 1 APP
• Corporate Authors:

  Cncl Scient & Indus Res /S Africa

  /Nat Inst Road Res
  ,   United States 

  Nat Inst Road Research /S Africa

  ,    
• Authors:
  • Dehlen, G L
• Publication Date: 1967-1

Subject/Index Terms

• TRT Terms: Curvature; Deflection; Deflectometers; Highways; Pavements; Surface course (Pavements)
• Old TRIS Terms: Highway pavement
• Subject Areas: Highways; Pavements;

Filing Info

• Accession Number: 00207220
• Record Type: Publication
• Files: TRIS
• Created Date: Dec 28 1970 12:00AM