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[SEAOC] Precast Prestressed Concrete in a Marine Environment

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We are looking at building a RO-RO wharf using Precast prestressed box 
beams of the type you see in bridge design.

The concern has been raised that this would not be an appropriate 
application of this type construction, due to the corrosive nature of said

Primarily, the concerns are these:

1) Any cracking would expose prestressing strands to the harshly corrosive

2) Prestressing strands are "small" and thus would represent more of a 
potential for catastrophic failure should corrosion be present.

3) Wharves of this type take a "pounding" and this is not the kind of 
loading situation that prestressed construction handles well.

I would like some other input.  If you could, please address the concerns 
above, and also answer these questions for me:

1) Have you any experience with the use of precast prestressed concrete in
a marine (or at least, estuarine) environment?

2) Do you have any feel for the life expectancy of such structures?

3) Are there any measures you would recommend, such as materials or 
additives to the concrete, to counter the anticipated "harsh marine 

Thanks in advance for any and all input.