LOAD AND DEFLECTION CHARACTERISTICS OF DOWELS IN TRANSVERSE JOINTS OF CONCRETE PAVEMENTS

LABORATORY TESTS WERE MADE ON SINGLE DOWELS ENCASED IN CONCRETE TO OBSERVE THE CHARACTERISTICS OF FAILURE AND THE RATE OF DEFLECTION OF TRANSVERSELY LOADED DOWELS IN CONCRETE. THE RATE AT WHICH THE CONCRETE REACTS UNDER A DEFLECTING DOWEL IS CALLED MODULUS OF DOWEL REACTION. LOADED 1/2 IN. FROM THE FACE OF THE CONCRETE, 3/4-IN. HARD GRADE DOWELS FAILED AT 6000 LB. DOWEL LOAD AND 1-IN. INTERMEDIATE GRADE DOWELS AT 9000 LB. DOWEL LOAD, WHEN ENCASED IN 3000 LB. PER SQ. IN. CONCRETE. WARNING OF FAILURE IS GIVEN BY SURFACE SPALLING UNDER THE DOWEL, COMMENCING AT LOADS CONSIDERABLY LESS THAN THE ULTIMATE. ULTIMATE FAILURE IS ACCOMPANIED BY CRUSHING OF THE CONCRETE IMMEDIATELY UNDER THE DOWEL. THE 3/4-IN. DOWELS ARE ALL PERMANENTLY BENT AT FAILURE. RELATIONSHIP OF DOWEL STRENGTH TO THE STRENGTH OF THE CONCRETE AND TO THE YIELD POINT OF THE STEEL IS INDICATED. A REASONABLE VALUE FOR THE MODULUS OF DOWEL REACTION FOR 3/4-IN. AND 1-IN. GREASED DOWELS IN 6-AND 7- IN. CONCRETE PAVEMENTS ON YIELDING SUBGRADE IS DEDUCED FROM THESE TESTS TO BE 300 TIMES THE UNIT CRUSHING STRENGTH OF CYLINDERS OF THE CONCRETE. /AUTHOR/

• Record URL:
  https://onlinepubs.trb.org/Onlinepubs/hrbproceedings/18/18Part1-010.pdf
• Supplemental Notes:
  • Vol 18, Pt 1, PP 140-161, 13 FIG, 4 TAB. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
• Authors:
  • Friberg, B
  • Richart, F E
  • Bradbury, R D
• Publication Date: 1939

Media Info

• Media Type: Digital/other
• Monograph Title: Proceedings of the Eighteenth Annual Meeting of the Highway Research Board Held at Washington, D.C. November 28-December 2, 1938. Part I
• Serial:
  • Highway Research Board Proceedings
  • Volume: 18
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Concrete pavements; Deflection; Dowels (Fasteners); Failure; Loads; Spalling; Transverse joints; Yield point
• Uncontrolled Terms: Loading
• Subject Areas: Geotechnology; Highways; Materials; Pavements;

Filing Info

• Accession Number: 00207176
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Jun 1 1971 12:00AM