00962063

Component

https://doi.org/10.3141/1827-05

http://scholar.google.com...gers&publication_year=2003

The use of polymer adhesives during the strengthening of 30-year-old prestressed concrete bridge girders is described. The single-T-shaped specimens strengthened in this study were saw-cut from prestressed concrete double-T girders that had been removed from a bridge originally designed for H-15 highway loading and opened to traffic in 1969. Over time, the bridge had been severely overloaded, resulting in numerous flexural and shear cracks in the stems of each girder and large concrete spalls at the tension faces. In 1998, several damaged members were replaced. To investigate the feasibility of repairing or strengthening similar members in the future, the damaged members were retrofitted with carbon fiber-reinforced polymer (CFRP) sheets and then load tested under service and ultimate load conditions. Polymer adhesives were used to seal all visible cracks in the stems, to inject epoxy into all sealed cracks, to fill spalled areas in the tension face of the stems, to apply longitudinal and transverse CFRP sheets to the stems of the members, and to install near-surface-mounted reinforcement (NSMR) in one of the specimens. Results from load tests indicate that excellent bond was consistently achieved between the CFRP sheets and the 30-year-old concrete surface and between the NSMR and surrounding concrete. The success of epoxy injection of the flexural cracks, however, varied. Specifically, the injected cracks in one specimen reopened at an applied load well below the theoretical cracking load for the members.

This paper appears in Transportation Research Record No. 1827, Highway Pavements and Structures Maintenance and Security.

English

p. 36-43

2003

Transportation Research Record

0309085608

Figures; Photos; References (11)

Adhesives; Bond strength (Materials); Carbon fibers; Epoxy resins; Fiber reinforced plastics; Girders; Load tests; Polymers; Prestressed concrete; Repairing; Structural strengthening

Highways; Maintenance and Preservation; I61: Equipment and Maintenance Methods

TRIS, TRB, ATRI

Aug 13 2003 12:00AM

• AIRBLAST ENVIRONMENT BENEATH A BRIDGE OVERPASS
• DEVELOPMENT OF STRUCTURAL CONDITION INDEX TO SUPPORT PAVEMENT MAINTENANCE AND REHABILITATION DECISIONS AT NETWORK LEVEL
• HIGHWAY VULNERABILITY ASSESSMENT: A GUIDE FOR STATE DEPARTMENTS OF TRANSPORTATION
• IMPLEMENTATION OF VIRTUAL REALITY IN ROUTINE BRIDGE INSPECTION
• PAVEMENT MANAGEMENT PERSPECTIVE ON INTEGRATING PREVENTIVE MAINTENANCE INTO A PAVEMENT MANAGEMENT SYSTEM
• PREDICTION METHOD FOR RESPONSE OF STEEL BRIDGE BEAMS AND GIRDERS TO BLAST AND FRAGMENT LOADS
• ROBOTIC MACHINE FOR HIGHWAY CRACK SEALING
• ULTRASONIC C-SCAN IMAGING: PRELIMINARY EVALUATION FOR CORROSION AND VOID DETECTION IN POSTTENSIONED TENDONS