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Re: corrosion of cor-ten type steels in concrete

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Didn't we already reply to this, in detail?  "We" meaning a bunch of
list members....



prakash chowdhury wrote:
> 
> 
> 
>   1. I will be grateful to receive any data/opinions/references on the
>      performance of corten- type weathering steels embedded in
>      concrete (with or without chloride contamination). Until ca.1989
>      the consensus was clearly negative but news of more recent
>      developments would be welcome.
>   2. ACI Committee 222, in its Publ. 222 R-89 (Corrosion of Metals in
>      Concrete), pronounced such steels as "not suitable for
>      reinforcement" since embeddment in concrete deprives the steel of
>      the very exposure to atmosphere that is esential for the
>      development of the corrosion resisting dense oxide film.
>   3. The Building Research Establishment (BRE,U.K.) conducted
>      long-term exposure tests of such weathering steels in concrete
>      and reported (Durability of Corrosion Resisting Steels in
>      Concrete by Treadway et al.,Proc.I.C.E. Part 1,1989) :
> 
>   a. for low levels of chloride contamination, weathering steels do
>      not improve durability and hence do not justify the additional
>      costs, and
>   b. for high levels of chloride contamination, pitting corrosion was
>      sufficiently severe to indicate that weathering steels would be
>      unsuitable.
> 
>      4. In spite of such consistently negative recommendations (based
>      on both theory and experiments), such steels are being specified
>      for RC structures in India based mainly on manufacturers? claims
>      of their superior corrosion resistance in concrete. Any feedback
>      from international sources would greatly benefit the evolvement
>      of a consensus among civil engineering consultants and clients.
> 
> Prakash C. Chowdhury (New Delhi)
> 
> ******************************************************************
> 
> Prakash C. Chowdhury, B.Sc.(Surrey),
> Ph.D.(N'cle)
> 
> Regional Resident Representative
> 
> Torsteel Research Foundation
> 
> H-1A, Hauz Khas
> 
> New Delhi - 110 016, India
> 
> E-mail : pcchowdhury(--nospam--at)yahoo.com
> 
> ******************************************************************
> 
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