Re: [PSUBS-MAILIST] Concrete submarines

[EM <emuller@naic.edu>]

So how do you make the forms?
EM.


On Thu, 16 Jun 2005, Michael Edwards wrote:

> Greetings Juergen & subbers:
> 
> Below is a clip of Wilfrieds (the concrete guru) response to the water 
> tight question.
> I am unaware of any other projects in the works, do you know?
> 
> I just bought the cement mixer for ferrocement projects on the farm, 
> but am a long
> way from knowing enough for a pressure hull. I had few additional 
> private post with
> Wilfried but still don't understand his mold method without any 
> pictures.
> 
> I think this technology has great promise for submarines. Keep us 
> posted!
> 
> Best regards
> Michael Edwards
> 
> ==========================================================
> Subject:  [PSUBS-MAILIST] con
> Date: Sun, 28 Sep 2003 20:10:55 -0500 (COT)
> From: diagroto@ibague.cetcol.net.co
> Reply-To:  personal_submersibles@psubs.org
> To:  Personal_Submersibles@psubs.org
> 
> Dear D,
> Not sure to understand your question completly. In any case this was 
> MASSIVE
> concrete 18cm walls - steel 6mm bars as in normal construction must be 
> in
> middle of wall (at least 2 cm from surface) to avoid rust and take full
> tension.(every construction engineer knows it) NO chicken wire involved 
> !
> No construction in LAYERS this is ferrocement (chicken wire) for thinn 
> hulls
> (1-3cm) of yachts. My sub was MASSIVE concrete. Liqid in form and 
> compacted as
> in normal construction.
> 
> Of course was it watertight.
> You seem to have concerns about concrete in direct contact with 
> seawater. My
> boat had a outer skin of 5mm bitumen (tar) reinforced with glass fiber.
> So concrete is not in contact with water under pressure - this is 
> similar in
> dam construction. In deed in dam construction filtration problem is by 
> far
> more severe as you have to connect a dam with rock that is filtering 
> etc. in
> practice all this is managable. Covering a submarine with a waterthight 
> skin
> is quite easy compared to that.
> 
> All in all in practice concrete in seawater contact is by far less 
> problematic
> as steel or aluminium in sea water contact.
> Can handle it. Problem of CaCo3 process reverse is more in theory than 
> in
> practice. Oil tanks in north sea, drilling platform underwater 
> struckture all
> in concrete are already in use and never presented problems most of them
> without any coating.
> 
> Just make following experiment put a concrete, alu, steel probe (holow 
> shpere)
> in saltwater under pressure during a month.
> Will see that concrete will alterate by far less than other materials.
> 
> 
> Kind Regards
> 
> Wilfried
> ===========================================================
> 
> On Jun 16, 2005, at 1:42 AM, Juergen Guerrero Kommritz wrote:
> 
> Hello Psubbers
> I am searching some information about concrete for
> submarine hulls.  I know at least one submarine was
> build with concreteand there were some other projects
> on the work.
> I want to know if the it is possible to use "normal"
> portland concrete for the hull I dont´t know if this
> will be enought (water thigth)and it is impermeable
> or if it is better to use an special sealling product
> for the outer coating layer.
> May be it is better to use a sealling product in all
> the concrete mixture?
> I only have little experience with concrete (only
> portland) building bricks and a small water tank that
> was not very impermeable.
> I thank you for any information
> Best wishes
> Jürgen
> 
> 
> 
> 
> 		
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