LOAD CARRYING CAPACITY OF MINNESOTA SECONDARY FLEXIBLE PAVEMENTS

THE LOAD CARRYING CAPACITIES OF HIGHWAYS IN MINNESOTA HAVE BEEN EVALUATED BY A PLATE BEARING TEST PROCEDURE FOR SIXTEEN YEARS. HOWEVER, THE PLATE BEARING TEST REQUIRES A SPECIAL TRAILER, THE TOTAL COST OF WHICH IS SUCH THAT IT IS NOT FEASIBLE FOR MOST COUNTIES TO ACQUIRE IT. ANOTHER METHOD OF EVALUATING ROAD STRENGTH, THE BENKELMAN BEAM TEST WAS STUDIED AND RESULTS RELATED TO THOSE OF THE PLATE BEARING TEST. FIELD MEASUREMENTS WERE MADE OVER A PERIOD OF SEVEN YEARS. THE BENKELMAN BEAM DEFLECTIONS ARE USED TO EVALUATE THE PAVEMENT STRENGTHS IN TWO WAYS: (1) THE DEFLECTIONS AND THE PLATE BEARING VALUES ARE CORRELATED OBTAINING THE ALLOWABLE TONNAGE CAPACITY OF THE PAVEMENT THROUGH PREVIOUSLY ESTABLISHED TONNAGE-PLATE BEARING VALUE RELATIONSHIPS, (2) THE ALLOWABLE SPRING TONNAGE IS ESTABLISHED DIRECTLY WITH THE BENKELMAN BEAM DEFLECTION TEST. RELATIONSHIPS BETWEEN THE PAVEMENT DESIGN AND THE TWO STRENGTH TESTS ARE ALSO PRESENTED. IT WAS FOUND THAT STRENGTH CAN BE PREDICTED TO 20-45 PERCENT ACCURACY FOR BEARING VALUE AND 40-59 PERCENT FOR BEAM DEFLECTION. IT IS CONCLUDED THAT THE PROCEDURE FOR EVALUATING FLEXIBLE PAVEMENTS WITH THE BENKELMAN BEAM IS LOGICAL AND THAT VALUABLE USAGE COULD BE MADE BY THE COUNTIES AND THE STATE HIGHWAY DISTRICTS.

  • Supplemental Notes:
    • Hpr-1/6/, STATE 302, BPR 3
  • Corporate Authors:

    University of Minnesota, Minneapolis

    Minneapolis, MN  USA  55455
  • Authors:
    • Skok, E L
  • Publication Date: 1967-6-30

Subject/Index Terms

Filing Info

  • Accession Number: 00206310
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS
  • Created Date: Jan 8 1994 12:00AM