Improvement of Bridge Durability

Additional Articles and Studies

Article/Study Title: Ways to Improve the Durability of Bridges and Engineered Transportation Structures

Authors: Dr. Zvi Reichverger – Dr. Zvi Reichverger Consulting & Building. Ltd;Gil Greenberg, M.Sc. – Amy Metom Engineers & Consultants, Ltd;Michal Ashour, M.Sc. – Amy Metom Engineers & Consultants, Ltd.

Client: Netivei Israel – Israel National Roads Company

Abstract: The principal aim of this work was to survey existing information in the field of improving the durability of reinforced concrete structures in a corrosive environment. During the research, factors were referenced that impact protection of reinforcing from corrosion: concrete density and resistance to penetration of agents that cause corrosion, coverage thickness, maximum width of cracks and additional means of protection such as additives and protective coatings on the reinforcing bars. Data was also surveyed that covers the condition of corrosion in existing bridges as a function of distance from the coastline. The research was based on a survey of professional literature and international standards in the United States, Britain, Canada, Australia and other places as well as research in the field of protection of reinforcing bars with galvanizing, epoxy coatings or stainless steel coatings or with the use of non-metallic reinforcing bars. Extensive experience in the use of protected reinforcing bars was covered, while referencing the advantages and disadvantages of [each] method and its efficacy from the standpoint of improving the durability of concrete structures in a corrosive environment. The findings of the survey were used to formulate recommendations for improving the durability of bridge structures and other engineered structures in a corrosive marine environment, which was extended to 3000 m from the sea based on the findings of the survey. Our recommendations included strengthening requirements for concrete quality and resistance to the penetration of agents that cause corrosion (water, carbon dioxide and chloride ions). We recommended the use of slag cement or mixed cement in certain cases and also recommended the use of protected reinforcing bars (in particular, galvanized reinforcing) to extend service life under harsh service conditions. The study was presented at the 7th Conference of the Israel Engineers Association for Construction and Infrastructure.

Link to the Full Article/Study: Link

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