LABORATORY TESTS OF SEALERS FOR SAWED JOINTS

THE PERFORMANCE OF SEALING MATERIALS FOR SAWED JOINTS IS BEING STUDIED BY A LABORATORY TEST IN WHICH THE JOINTS ARE OPENED AND CLOSED AT SPEEDS OF THE ORDER OF 1/32 INCH PER HOUR. THE SEALERS ARE APPLIED TO SAWED JOINTS WHICH ARE INITIALLY 1/8 OR 3/16 INCH WIDE AND WHICH ARE USUALLY OPENED AN ADDITIONAL 1/8 INCH AT 0 F DURING THE TESTS. THIS TEST PROCEDURE APPEARS TO BE MORE SEVERE THAN METHOD 223.11 OF FEDERAL SPECIFICATION SS-R-406C. TESTS HAVE BEEN CONDUCTED ON CONVENTIONAL SEALERS AS WELL AS ON MATERIALS WHICH ARE STILL IN THE DEVELOPMENT STATE OR WHICH HAVE BEEN DEVELOPED FOR OTHER APPLICATIONS. THE RESULTS HAVE SHOWN THAT EXTENSIBILITY IS NOT STRICTLY AN INHERENT PROPERTY OF THE MATERIAL, BUT IS HIGHLY DEPENDENT ON THE RELATIVE DIMENSIONS OF THE CROSS-SECTION OF THE SEALER, REFERRED TO AS THE SHAPE FACTOR. THE IMPORTANCE OF THE SHAPE FACTOR INDICATED THE DESIRABILITY OF DEVELOPING SUITABLE ELASTOMERS IN SHAPES OF FORMS THAT WOULD AVOID THE HIGH STRESS CONCENTRATIONS WHICH CAUSE BOND FAILURES. FOAMS OR HOLLOW SHAPES MIGHT SATISFY THESE REQUIREMENTS. THE CONCLUSION IS DRAWN THAT INITIAL JOINT WIDTHS MUST BE DESIGNED IN RELATION TO THE JOINT SEALER MATERIAL, THE JOINT SPACING, AND THE CLIMATE. ALTHOUGH MATERIAL COSTS OF SOME POTENTIALLY USEFUL SEALERS ARE HIGH, THEY MAY NOT BE HIGH IN TERMS OF LIFETIME PERFORMANCE. THE WORK REPORTED COVERS THE PERIOD 1955 THROUGH 1957 AND IS PART OF A CONTINUING PROGRAM. /AUTHOR/

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/hrbbulletin/211/211-001.pdf
• Supplemental Notes:
  • No 211, pp 1-12, 9 FIG, 8 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:
  • Kuenning, William H
• Publication Date: 1959

Media Info

• Monograph Title: Sealers for joints and cracks in concrete pavements
• Serial:
  • Highway Research Board Bulletin
  • Issue Number: 211
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Bonds; Climate; Cross sections; Elastomers; Joint sealers; Laboratory tests; Sawed joints; Sealing (Technology); Shape; Stresses; Test procedures
• Uncontrolled Terms: Stress concentration
• Old TRIS Terms: Sealing; Shape factor
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00216721
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Apr 28 1994 12:00AM