FUTHER STUDIES OF EPOXY BONDING COMPOUNDS

A STUDY IS REPORTED OF AN EPOXY FORMULATION CALLED FORMULATION G WHICH IS SUITABLE FOR APPLICATION IN THE FIELD OF HEAVY CONSTRUCTION. LONG TIME STUDIES WERE CONDUCTED INVOLVING THE AGING AND CREEP CHARACTERISTICS OF THE MATERIAL. SEVERAL EPOXY FORMULATIONS WERE STUDIED. THE FACTORS OTHER THAN STRENGTH WHICH GOVERN THE CHOICE OF A SUITABLE FORMULATION ARE SPRAY-ABILITY, VISCOSITY, BRITTLENESS, ABILITY TO SET IN THE PRESENCE OF WATER, POT LIFE AND RESILIENCE. FORMULATION G SATISFIES ALL OF THESE CONSIDERATIONS FOR THE APPLICATIONS INVESTIGATED. A NON- STANDARD SHEAR TEST, NAMED THE SINGLE SHEAR ADHESION TEST, WAS DEVELOPED WHICH IS CONSIDERED RELIABLE FOR PREDICTING THE SHEAR STRENGTH OF A METAL-TO-CONCRETE ADHESIVE SYSTEM. POWER MIXING WAS FOUND TO BE SUPERIOR TO HAND MIXING FOR PREPARATION OF THE COMPONENTS AND FOR MIXING THE COMPONENTS. SANDBLASTING IS THE MOST SATISFACTORY METHOD FOR PREPARING A STEEL SURFACE, AND IS RECOMMENDED FOR COMPOSITE BEAM CONSTRUCTION IN THE FIELD. THE MAJOR STRENGTH OF THE EPOXY FORMULATION IS DEVELOPED WITHIN THE FIRST THREE DAYS. IN USING THE RECOMMENDED FORMULATION, THE CONCRETE SHOULD BE APPLIED WITHIN FOUR HOURS AFTER APPLICATION OF EPOXY TO THE STEEL. TEST RESULTS ARE REPORTED ON CREEP, FATIGUE ON GLUED JOINTS, IMPACT, STRENGTH GAIN UNDER VARIOUS PROGRAMMED TEMPERATURE CONDITIONS, EFFECT OF CHANGES IN FILLER CONTENTS, CATALYSTS, FLEXIBILIZERS, AND DEFORMATION CHARACTERISTICS OF MATERIALS. THE PERFORMANCE CHARACTERISTICS OF FORMULATION G AS A SHEAR CONNECTOR WERE FURTHER STUDIED BY ADDITIONAL COMPOSITE BEAM TESTS. FREEZE- THAW CYCLING OF STEEL TO MORTAR ADHESION SPECIMENS DID NOT AFFECT THE EPOXY, ONLY THE MORTAR. CONCRETE T-BEAMS, CONSISTING OF S SLAB GLUED TO A STEM WITH EPOXY, PROVED EQUAL IN STATIC TESTS ONLY TO MONOLITHIC T-BEAMS OF THE SAME DIMENSIONS. A SINGLE COMPOSITE STEEL-TO-CONCRETE BEAM, USING THE EPOXY AS A SHEAR CONNECTOR DEVELOPED 10/11 OF THE ULTIMATE FLEXURAL STRENGTH OF A LIKE BEAM IN WHICH STUD CONNECTORS WERE USED. THE EPOXY GLUED BEAM SHOWED BETTER INTERACTION AT HIGH LOADS. THE EPOXY FORMULATION PROVED SUPERIOR TO A MORTAR SLURRY IN A GROUTING APPLICATION AS DEMONSTRATED BY A SERIES OF PULL-OUT TESTS. THE EPOXY WAS MORE EASILY APPLIED, AND SHOWED MUCH GREATER BOND STRENGTH BETWEEN THE STEEL INSERTS AND CONCRETE CORES WHICH WERE TESTED. THE COST OF AN EPOXY FORMULATION FOR USE AS A SHEAR CONNECTING DEVICE IN COMPOSITE CONSTRUCTION IS NOT PROHIBITIVE.

• Supplemental Notes:
  • 153 Pp, 100 FIG, 20 TAB, 44 REF, 3 APP
• Corporate Authors:

  Highway Research Board

  2101 Constitution Avenue, NW
  Washington, DC    20418
• Authors:
  • Miklofsky, H A
  • Gonsior, M J
  • Santini, J J
• Publication Date: 1965

Subject/Index Terms

• TRT Terms: Beams; Bonding; Brittleness; Composite construction; Composite materials; Concrete; Concrete tests; Crash tests; Creep properties; Economics; Epoxides; Fasteners; Flexural strength; Freeze thaw tests; Metal working; Resilience (Materials); Shear reinforcement; Shear strength; Shear tests; Sprayers; Structural tests; Viscosity
• Uncontrolled Terms: Composite beams; Shear connectors; Spraying
• Old TRIS Terms: Aging; Epoxy; Metal bonding
• Subject Areas: Bridges and other structures; Economics; Geotechnology; Highways; Materials; Research;

Filing Info

• Accession Number: 00216880
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Oct 21 1994 12:00AM