A COMPARATIVE STUDY OF DATA FROM THE COOPERATIVE INVESTIGATION OF JOINT SPACING

IN 1945 THE HIGHWAY RESEARCH BOARD PUBLISHED A SPECIAL BULLETIN CONTAINING PROGRESS REPORTS FROM EACH OF THE SIX STATES PARTICIPATING IN THE COOPERATIVE INVESTIGATION OF THE SPACING OF EXPANSION JOINTS IN PAVEMENTS WITH CLOSELY SPACED CONTRACTION JOINTS. THE MOST IMPORTANT DEVELOPMENTS OBSERVED IN THE STUDY OF THE MOVEMENTS AT THE JOINTS ARE: (1) EXPANSION JOINTS CLOSE PROGRESSIVELY WITH TIME, THE AMOUNT OF PERMANENT CLOSURE BEING GREATEST DURING THE FIRST ANNUAL CYCLE; (2) CLOSURE OF EXPANSION JOINTS APPARENTLY CONTINUES UNTIL ALL AVAILABE EXPANSION SPACE HAS BEEN USED UP; (3) CONTRACTION JOINTS OPEN PROGRESSIVELY WITH TIME, THE RATE OF OPENING BEING GREATEST DURING THE EARLY LIFE OF THE PAVEMENT; (4) THE MAGNITUDE OF THE PERMANENT OPENING OF CONTRACTION JOINTS DECREASES WITH AN INCREASE IN THE SPACING OF EXPANSION JOINTS, OTHER CONDITIONS BEING EQUAL. IN THE RELATED STUDY OF THE STRUCTURAL BEHAVIOR OF WEAKENED-PLANE CONTRACTION JOINTS IT WAS FOUND THAT: (1) IN THE PRESENCE OF INTERFACIAL PRESSURE, MUCH LESS THAN MIGHT DEVELOP IN PAVEMENTS UNDER CONDITIONS OF RESTRAINED EXPANSION, WEAKENED-PLANE JOINTS ARE VERY EFFECTIVE IN REDUCING CRITICAL STRESES; AND (2) WITHOUT INTERFACIAL PRESSURE, AGGREGATE INTERLOCK IS AN UNCERTAIN MEANS OF STRESS CONTROL REGARDLESS OF TYPE AND SIZE OF COARSE AGGREGATE. SOME MEASURE OF THE STRUCTURAL EFFECTIVENESS OF THE CONTRACTION JOINTS IN THE EXPERIMENTAL PAVEMENTS WAS PROVIDED BY COMPARING THEIR OBSERVED OPENINGS WITH THE RELATIONS ESTABLISHED FROM THE JOINT EFFICIENCY STUDY MENTIONED ABOVE. IT WAS CONCLUDED FROM THIS COMPARISON THAT CONTRACTION JOINTS OF THE WEAKENED-PLANE TYPE ARE, ON THE WHOLE, NOT EFFECTIVE IN CONTROLLING CRITICAL STRESSES CAUSED BY LOADS ACTING AT THEIR EDGES. /AUTHOR/

  • Supplemental Notes:
    • Vol 26, pp 235-249, 6 FIG, 2 TAB
  • Authors:
    • Sutherland, E C
    • Cashell, H D
    • Heltzel, J N
  • Publication Date: 1947

Media Info

  • Monograph Title: Proceedings of the Twenty-Sixth Annual Meeting of the Highway Research Board Held at Washington, D.C. December 5-8, 1946
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00207314
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: May 29 1972 12:00AM