USE OF URETHANE FOAM IN PAVEMENT PRESSURE RELIEF JOINTS AT BRIDGES
STRUCTURAL BRIDGE DAMAGE, THE RESULT OF PRESSURE AGAINST THE STRUCTURE FROM GROWTH OR MOVEMENT OF PORTLAND CEMENT CONCRETE PAVEMENT, CAUSED THE IOWA STATE HIGHWAY COMMISSION MAINTENANCE DEPARTMENT TO MAKE A STUDY OF MATERIALS THAT COULD EFFECTIVELY BE USED IN PRESSURE RELIEF JOINTS IN THE PAVEMENT NEAR THE BRIDGES. IT WAS FOUND THAT A 4-IN. WIDE JOINT, THE BOTTOM PART FILLED WITH A 4-LB PER CU FT RIGID TYPE URETHANE FOAM AND THE TOP PART FILLED WITH AN 18-LB PER CU FT FLEXIBLE TYPE URETHANE FOAM, WOULD MINIMIZE THIS STRUCTURAL DAMAGE. THE BASIC REQUIREMENTS ARE THAT MATERIALS MUST BE READILY COMPRESSIBLE, CHEMICALLY INERT, FLEXIBLE THROUGH FULL RANGE OF NORMAL AIR TEMPERATURES, READILY ADAPTABLE TO VARIOUS WIDTHS AND DEPTHS OF JOINT, CAPABLE OF REJECTING FOREIGN OBJECTS, AND EASILY USED BY LOCAL MAINTENANCE FORCES. THE LIQUID COMPONENTS FOR THE FOAM ARE WEIGHED AND MIXED AT THE WORK SITE AND POURED INTO THE JOINT . CHEMICAL REACTION OF THE LIQUID COMPONENTS RESULTS IN A POURED-IN-PLACE FOAM-FILLED JOINT. THE MATERIAL HAS BEEN IN USE FOR THREE YEARS AND RESULTS ARE SATISFACTORY.
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Supplemental Notes:
- Paper sponsored by Committee on Maintenance of Portland Cement Concrete Pavements and presented at the 46th Annual Meeting. 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:
- Smiley, F A
- Publication Date: 1967
Media Info
- Media Type: Print
- Features: Appendices; Figures;
- Pagination: pp 25-32
- Monograph Title: Maintenance and equipment
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Serial:
- Highway Research Record
- Issue Number: 173
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Bridges; Foamed materials; Joints; Loss and damage; Pavements; Portland cement concrete; Pressure; Rubber; Urethane
- Old TRIS Terms: Foam rubber; Joint; Pressure control; Relieving
- Subject Areas: Bridges and other structures; Geotechnology; Highways; Maintenance and Preservation; Materials; Pavements;
Filing Info
- Accession Number: 00218148
- Record Type: Publication
- Report/Paper Numbers: HS-000 708
- Files: TRIS, TRB
- Created Date: Sep 5 1994 12:00AM