FACTORS IN JOINT SEAL DESIGN
RECENT THEORETICAL AND EXPERIMENTAL INVESTIGATIONS HAVE HELPED TO EXPLAIN THE BEHAVIOR OF ONE-PHASE /SOLID/ EXTENSION-COMPRESSION TYPE JOINT AND CRACK SEALANTS AND HAVE REVEALED THEIR LIMITATIONS. IF A ONE-PHASE, CONSTANT VOLUME SEALANT HAS TO GO THROUGH A TENSION CYCLE, TWO SITUATIONS ARE POSSIBLE' /1/ IF THE SEALANT IS ELASTIC WITH NO PERMANENT DEFORMATION AND STRESS RELAXATION, LONG-TERM STRESS ON THE BOND INTERFACE COUPLED WITH IMPERFECTIONS IN THE BOND AND WATER EFFECTS CAN RESULT IN ADHESION FAILURE OF THE SEAL, OR /2/ IF THE SEALANT UNDERGOES PERMANENT DEFORMATION /ACCOMPANIED BY STRESS RELAXATION/, THE STRESSES ON THE BOND MAY BECOME SMALL /OR NEGLIGIBLE/, BUT THE SHAPE OF THE SEALANT IS DISTORTED. THIS AGAIN MAY RESULT IN INABILITY OF A SEALANT TO PERFORM ITS FUNCTION. IT IS APPARENT THAT A SEAL WHICH CAN RETAIN ITS SHAPE AND NOT PLACE ANY TENSILE STRESS ON THE CONTACT SURFACE BETWEEN THE SEALANT AND THE JOINT WOULD BE MORE EFFECTIVE, AT LEAST THEORETICALLY. RECENT FIELD RESEARCH HAS INDICATED THAT AT LEAST ONE TYPE OF PRECOMPRESSED ELASTIC SEALANT WHICH IS IN COMPRESSION ALL THE TIME PROMISES TO SERVE LONGER THAN TENSION-COMPRESSION SEALANTS WHEN RELATIVELY LARGE JOINT WIDTH VARIATIONS ARE EXPECTED. POURED-IN-PLACE TENSION- COMPRESSION SEALANTS ARE EXPECTED TO PERFORM WELL IN JOINTS WITH QUITE SMALL CYCLIC VARIATIONS IN WIDTH. CRACKS CAN ALSO BE SEALED WITH SUCH SEALANTS. /AUTHOR/
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Supplemental Notes:
- 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.
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Authors:
- Tons, Egons
- Publication Date: 1965
Media Info
- Media Type: Digital/other
- Features: Figures; References;
- Pagination: pp 49-56
- Monograph Title: Joints and sealants - a symposium and other papers
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Serial:
- Highway Research Record
- Issue Number: 80
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Compression; Cracking; Durability; Experiments; Field tests; Joint sealers; Sealing compounds; Theory
- Old TRIS Terms: Elastics; Precompression
- Subject Areas: Geotechnology; Highways; Materials;
Filing Info
- Accession Number: 00215803
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: Dec 12 1994 12:00AM