[AGA Member] Re: Portland Cement and aquatic structures

["S. Hieber" <shieber@yahoo.com>]

Very interesting.  

Muriatic or any other acid eats away at portland cement. 
That's why v inegar is used to clean off excess grout on
tile installations.

I wonder what effect it has on the pH effects.  If it ate
away all the cement, what's the point.  If only some,
ther's more behind to affect pH.
If lime was added in a top coat, I could see trying to wash
that off.

Scott H.
--- SCOTTR403@aol.com wrote:
> 
> As an exhibitry professional here are some comments:
> 
> With Rainforest Cafe, we built numerous aquatic features
> with cement.
> 
> Basically we made a gunite mixture that was app. 50%
> portland cement to 50% 
> sand. water was added and the mixture was heavily
> stirred.
> 
> The gunite was trowled over wire mesh and rebar.....for
> aquarium use, PVC is 
> used for the frame work and mesh is attached with plastic
> cable ties....
> 
> typically the cement is cured , scrubbed with a wire
> brush and then treated 
> with muriatic acid and rinsed well.... for our ponds and
> waterfalls, we applied 
> a liquid rubber coating.... without the muriatic acid
> treatment, the pH of 
> the water would remain high.
> 
> Regards,
> 
> Scott Robins
> Aquatic Interiors, Inc.
> 
> 
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