corrosion consultancy,corrosion courses,corrosion expert witness

Consulting Training Expert Witness Failure Analysis Design Review Corrosion Test Inspection Coatings Materials CP >>>


Corrosion Special Topical Papers

Emerging Corrosion Control Technologies for Repair
 and Rehabilitation of Concrete Structures
*

Dr. Jianhai Qiu
School of Materials Engineering
Nanyang Technological University
Nanyang Avenue, Singapore 639797

6.5 Intelligent Use of Stainless Rebars

Stainless steels offer almost maintenance-free solution to the problem of long-term durability of concrete structures and can be used within existing design codes and practice in two ways. The simplest but more expansive option would be to use 100% stainless rebar to replace existing carbon steel rebar. This would eliminate corrosion and enable a design life in excess of 120 years. The total cost can be competitive when life cycle costing is taken into account. To reduce the cost, stainless steel rebar can be used intelligently in areas of a structure such as bridge joints, splash zones, support structures and column heads where carbon steel rebars are judged to be at high risk of corrosion. If stainless rebars are used in vunerable areas where cracking occurs and water enters, there will be no significant corrosion and the structure will remain sound. It has been estimated that the stainless steel content on prestigious structures would be as little as 7~20%. The same concept can be used in other structures such as general building where peripheral or external walls could be constructed from stainless steel rebar linking in to carbon steel rebar for the internal structures where corrosion is not a problem.

6.6 Applications

Sydney Opera House
Type 316 stainless steel rebar and mesh replacing carbon steel reinforced concrete which failed after
about 25 years of service (Photo copyrighte dby NiDI)

140 tonnes of Type 304 stainless steel rebar being installed in an addition to the historic
Guildhall, London
(Photo copyrighte dby NiDI)


Type 316LN rebars being installed in a bridge deck on highway 407 just north of
Toronto, Canada
(Photo copyrighte dby NiDI)
 

<<<Previous Page

[Page 1] [Page 2] [Page 3] [Page 4] [Page 5]  [Page 6] [Page 7] [Page 8] [Page 9] [Page 10] [Page 11]

 Next Page>>>

 Home |Contact Us

Copyright © 1995-2018. All rights reserved