Re: [PSUBS-MAILIST] concrete sub - let form on hull

[clientes@tolimared.com]

Hello Brian, forms that stay on hull is not the way they do it in drillrigs,
tunnels, towers etc... may work - may not - see big problems in compacting ... 
slip form is how engineers do it.
Anyhow if you do something non-proved let me know how it results...good luck!
Kindest Regards
Wilfried

> Jay, Wilfried, and all,
>                                     Since I'm getting ready to plaster
> my ferro-cement hull soon I'm intrigued by all thing cement !   I've
> been investigating some of these large concrete pipe manufacturers here
> in California and I'm thinking of having them do the concrete mix and
> pouring.  (for my big concrete sub)  The idea I have is instead of
> making a wooden form, inside and out,  to hold the concrete while it is
> curing, is to instead build a ferro-cement form inside and out.  Then,
> once the concrete is poured and cured, the ferro-cement form is simply
> left in place and becomes part of the sub.  This way there would be no
> need to remove forms.   Another advantage of doing this would be the
> interior details could be worked on before the structural concrete was
> injected inbetween the ferro cement walls.
> 
> Brian
> 
>   ----- Original Message ----- 
>   From: Jay K. Jeffries
>   To: personal_submersibles@psubs.org
>   Sent: Wednesday, February 14, 2007 16:45
>   Subject: RE: [PSUBS-MAILIST] concrete sub - sand and gravel
> 
> 
>   Brian,
> 
>   The quality of the water is also important.  Here in the Bahamas they
> use slightly brackish water and their rebar quickly corrodes as a result
> resulting in spauled concrete.
> 
>   R/Jay
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> ------------------------------------------------------------------------
> ------
> 
>   From: owner-personal_submersibles@psubs.org
> [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Brian Cox
>   Sent: Wednesday, February 14, 2007 12:04 PM
>   To: Personal_Submersibles@psubs.org
>   Subject: [PSUBS-MAILIST] concrete sub - sand and gravel
> 
> 
> 
>   Wilfried,
>                   Where you plan to build the concrete sub, what is the
> quality of the sand and gravel ?  According to concrete experts that I
> have talked to this is very important for the ultimate strenght of the
> cured concrete.  For instance, here in Ventura California where I live,
> the geology of the area here on the coast,  the rock here is not good
> for strong concrete.  I have to make sure I get sand and gravel from the
> desert area where there are deposits of granite.
> 
>   Brian Cox
> 






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