REPAIR OF CONCRETE BRIDGE PAVEMENTS
THE MECHANISM OF CONCRETE FAILURE IS DISCUSSED. CONCRETE IN A BRIDGE DECK IS SUBJECTED TO STRESSES RESULTING FROM DIMENSIONAL CHANGES. THERE IS A SHRINKAGE OF THE CONCRETE IN THE TRANSITION FROM THE PLASTIC TO THE RIGID STATE, WHEN IT DRIES AND WHEN THE TEMPERATURE DROPS. CHEMICAL EFFECTS AND THE FREEZING AND THAWING EFFECT CAN CAUSE EXPANSION. THE MOST DIFFICULT STRESS IS CAUSED BY VERTICAL DEFLECTIONS. A REPAIR MATERIAL MUST THEREFORE WITHSTAND THESE STRESSES. IT MUST HAVE STRENGTH, FLEXIBILITY, ADHESIVENESS, AND A LOW SUSCEPTIBILITY TO TEMPERATURE CHANGE. EPOXIES CAN BE FORMULATED TO HAVE ALL THESE PROPERTIES. THE VARIOUS MATERIALS AVAILABLE FOR THE REPAIR OF CONCRETE ARE DISCUSSED AS WELL AS THE EPOXIES. THE EPOXIES DISCUSSED ARE STRAIGHT EPOXIES, POLYSULFIDE AND POLYAMIDE EPOXIES, AND COAL-TAR EPOXIES. TEST RESULTS ARE GIVEN ON THESE MATERIALS AND ON THE EFFECT OF FORMULATION ON THEIR PROPERTIES. THE USE OF EPOXIES AS A SURFACE TREATMENT, AS AN ADHESIVE, AND AS A BINDER IS DISCUSSED. FOR DEEP REPAIRS A POLYSULFIDE OR POLYAMIDE ADHESIVE WITH A HIGH-STRENGTH QUICK-SETTING CONCRETE IS PREFERRED. FOR SHALLOW REPAIRS AN EPOXY MORTAR IS FAVORED. SURFACE TREATMENTS ARE QUESTIONABLE. /ACIJP/
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Supplemental Notes:
- Sp 21, pp 53-66, 5 FIG, 7 REF
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Corporate Authors:
American Concrete Institute (ACI)
38800 Country Club Drive
Farmington Hills, MI United States 48331 -
Authors:
- Kampf, L
- Publication Date: 1968
Subject/Index Terms
- TRT Terms: Adhesives; Binders; Bridge decks; Coal tars; Concrete; Deflection; Epoxy resins; Expansion; Failure; Formulations; Freeze thaw durability; Loads; Mortar; Pavements; Polyamide resins; Shrinkage; Surface treating
- Uncontrolled Terms: Vertical loads
- Old TRIS Terms: Freezing thawing effects; Pavement deflection
- Subject Areas: Geotechnology; Highways; Maintenance and Preservation; Materials; Pavements;
Filing Info
- Accession Number: 00216770
- Record Type: Publication
- Files: TRIS
- Created Date: Sep 15 1994 12:00AM