Steel reinforced concrete is the main material to build todays bridges and highways. The maintenance costs of such buildings are very high and they are permanently increasing because of ongoing corrosion during their lifetime.
I do not know about the costs involved in the restoration of bridges due to corrosion. Definitely it is an important area of research.
The Mechanical Department at UTP has undertaken development of materials and methods to extend the life of steel structures to minimizing corrosion. The strength of steel structures in buildings is also reduced due to fire. Research is undertaken to minimize damage and determine ways to enhance structural integrity at elevated temperatures. In both cases, coating materials are developed to handle this problem.
I watched an interesting presentation which deals with this question in 2014.
On page 18 you can find Benchmarks subdivided in Bridge components eq. Sub- and superstructures. It is an very generally approach. It might be a starting point for your studies.
You can also take a look in my publications at ResarchGate. There you can find a confernece paper which is dealing with this issure.
best regards
Fritz Binder
http://www.zement.at/downloads/kolloquium_kurzbeitraege_2014_kl.pdf
Conference Paper Life cycle costs of selected concrete repair methods demonst...
Bericht „Strategie zur Ertüchtigung der Straßenbrücken im Bestand der Bundesfernstraßen“
"Das BMVBS schätzt den Bedarf für die Erhaltung der Bundesfernstraßen bis 2025 insgesamt auf über 3 Mrd. € jährlich ein. Der Anteil für die Erhaltung der Bauwerke (Brücken, Tunnel und sonstige Ingenieurbauwerke) einschließlich der Ertüchtigung der Brücken wird dabei von anfangs rund 30 % auf bis zu 45 % ansteigend abgeschätzt."
http://www.bmvi.de/SharedDocs/DE/Artikel/StB/systematische-brueckenertuechtigung.html?nn=121402
"Brückenertüchtigung jetzt - Ein wichtiger Beitrag zur Sicherung der Mobilität auf Bundesfernstraßen"
J. Neumann,
DBV Heft 22:
http://www.betonverein.de/schriften/startseite_hefte.php
http://www.google.de/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0CCIQFjAA&url=http%3A%2F%2Fwww.bdi.eu%2Fdownload_content%2FInfrastrukturUndLogistik%2FBrueckenstudie_endg..pdf&ei=ysAsVfO5MNTxaN3DgbgO&usg=AFQjCNHQXykV7F_YmszVtZma9-E1mfZwNw&bvm=bv.90790515,d.d2s
The cost of repairing the damaged structure using FRP can be very expensive as can be seen in the rehabilitation of MRR2 project in Malaysia. In Universiti Teknologi Malaysia, research on repairing of damaged structure by using pre-tensioned low-cost steel straps available in packaging industry has been carried out. Results showed concrete structure improvement comparable to FRP confinement. With the introduction of this method, the cost of repairing damaged concrete can be significantly reduced.
Article Experimental tests on SSTT-confined HSC columns
Article Slenderness effect and upper-bound slenderness limit of SSTT...
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