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[SEAOC] Re: under water concrete

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> Filip Van Rickstal asked a question about under water concrete, 

On Tue, 1 Oct 1996, Sprague, Harold O. wrote:

> 
> As important as the mix design is, you first need to establish placement 
> techniques...........  
> 
> Design the mix the same as you would for other sea water or fresh water as 
> applicable.  If sea water, use Type V Sulfate resistant cement, drop the w/c 
> ratio to about 0.40.  If it is reinforced consider an admixture like Armatec 
> by Sika, cathodic protection, rebar coatings, carbon fiber rebar, and/or 
> fiberglass fiber reinforcing to control micro cracks.
> 


The glass fibers in Fiberglass can deteriorate in an alkali environment, 
such as concrete submerged in seawater.   

Testing was done in Florida, on fiberglass rebars in precast concrete
piles.  After a couple of years exposurete, the glass fibers had
dissolved. (There was an article in the ACI journals about this testing) 


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Edwin R. Schmeckpeper, P.E., Ph.D.
Department of Civil Engineering                   Phone  : (208) 885-6702 
University of Idaho                               FAX    : (208) 885-6608
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