00734668

Monograph

http://onlinepubs.trb.org.../NCHRP011_Final_Report.pdf

This Innovations Deserving Exploratory Analysis (IDEA) project evaluated the feasibility of using advanced composite materials in the rehabilitation of deteriorated steel bridge members. The primary cause of such deterioration is loss of steel due to corrosion. Due to various conditions that accelerate corrosion, such as debris accumulation, the bottom flanges of girders are usually the site of the largest corrosion. The flexural characteristics of steel bridge girders are shown to be improved through the application of various repair schemes to the bottom flange. This investigation focused on the case of single span girders where the bottom flange is subjected to tensile stresses. The composite rehabilitations are attached to the corroded steel member using adhesive bonding; therefore, the durability of the adhesive bond under the various conditions that are present in the field over time is a critical issue. Durability tests were performed on a number of adhesives to determine the effect of the environmental conditions on the fracture toughness of the bond over time. Rehabilitation schemes were developed and tested for a variety of field conditions. One of the schemes was used to rehabilitate girders taken out of service in Pennsylvania due to excessive corrosion. This provided an opportunity for the process to be applied to a member of realistic size and with corrosion as exists in the national bridge inventory.

This NCHRP-IDEA investigation was conducted by the University of Delaware. 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

NCHRP-IDEA Project 011

NCHRP-93-ID011

English

34 p.

1996-6

NCHRP-IDEA Program Project Final Report

Appendices (1) ; Figures (16) ; Photos (9) ; Tables (7)

Adhesion; Adhesives; Composite materials; Corrosion; Driver rehabilitation; Durability; Environmental impacts; Flanges; Fracture properties; Girders; Metal bridges; Steel bridges; Technological innovations; Tension

National Cooperative Highway Research Program

Rehabilitation; Tensile stress

Bridges and other structures; Design; Environment; Geotechnology; Highways; Maintenance and Preservation; Materials; I24: Design of Bridges and Retaining Walls; I35: Miscellaneous Materials; I61: Equipment and Maintenance Methods

TRIS, TRB

Mar 26 2001 12:00AM