LOAD TRANSFER AT CONTRACTION JOINTS IN PLAIN PORTLAND CEMENT CONCRETE PAVEMENTS

IN 1960 THE FLORIDA STATE ROAD DEPARTMENT INITIATED A STUDY TO EVALUATE THE STATES DESIGN POLICY WITH RESPECT TO LOAD TRANSFER AT CONTRACTION JOINTS IN PLAIN CONCRETE PAVEMENTS. THE POLICY CALLED FOR CONTRACTION JOINTS AT 20- FOOT INTERVALS AND EXPANSION JOINTS AT BRIDGES AND SPECIAL LOCATIONS ONLY. DOWELS WERE REQUIRED AT ALL CONTRACTION JOINTS IN URBAN AREAS, BUT ONLY AT THE FIRST FIVE CONTRACTION JOINTS ON EITHER SIDE OF AN EXPANSION JOINT IN RURAL AREAS. THE STUDY WAS CONDUCTED IN THREE DIFFERENT CLIMATIC REGIONS OF THE STATE AND INCLUDED BOTH DOWELED AND NON-DOWELED CONTRACTION JOINTS. DATA WERE COLLECTED FROM A MINIMUM OF TWO TEST SITES IN EACH CLIMATIC REGION. PRIMARILY, THE DATA CONSISTED OF FAULTING MEASUREMENTS, JOINT-WIDTH MEASUREMENTS AND DEFLECTIONS OF THE LOADED AND UNLOADED SLAB CORNERS, FOR PURPOSES OF LOAD-TRANSFER COMPUTATIONS. THE STUDY INDICATED THAT' /1/ APPROXIMATELY THREE-FOURTHS OF ALL NON-DOWELED CONTRACTION JOINTS EXHIBITED SOME EVIDENCE OF FAULTING IN COMPARISON TO ABOUT ONE-THIRD OF THE DOWELED CONTRACTION JOINTS, /2/ AT THE END OF FOUR YEARS, APPROXIMATELY ONE-FOURTH OF THE NON-DOWELED CONTRACTION JOINTS WERE FAULTED 1/16 INCH OR MORE, RANGING UPWARD TO ABOUT 1/8 INCH, WHEREAS NONE OF THE DOWELED CONTRACTION JOINTS WERE FAULTED 1/16 INCH OR MORE, AND /3/ NEARLY ONE-FOURTH OF THE NON-DOWELED CONTRACTION JOINTS AND ABOUT ONE-EIGHTH OF THE DOWELED CONTRACTION JOINTS HAD LESS THAN 40% EFFECTIVE LOAD TRANSFER DURING COLD WEATHER, BASED ON A MAXIMUM LOAD TRANSFER OF 100%. THE CONCLUSION WAS DRAWN THAT THE DESIGN POLICY OF THE FLORIDA STATE ROAD DEPARTMENT WITH RESPECT TO LOAD TRANSFER AT CONTRACTION JOINTS WAS ADEQUATE DURING THE FIRST FOUR YEARS OF PAVEMENT LIFE. HOWEVER, IN THE LIGHT OF THE BEHAVIOR TRENDS, THE RECOMMENDATION WAS MADE THAT CERTAIN MEASUREMENTS BE CONTINUED FOR AN ADDITIONAL SIX YEARS TO PROVIDE MORE CONCLUSIVE INFORMATION ON THE POLICY. /BPR/

  • Supplemental Notes:
    • Hpr-1/1/, STATE I-C, BPR 3
  • Corporate Authors:

    Florida State Road Department

    ,    
  • Authors:
    • Smith, L L
  • Publication Date: 1965-6

Subject/Index Terms

Filing Info

  • Accession Number: 00205340
  • Record Type: Publication
  • Files: TRIS, STATEDOT
  • Created Date: Aug 1 1994 12:00AM