Re: [PSUBS-MAILIST] Concrete submarines

[diagroto@ibague.cetcol.net.co]

Hello Juergen

This is Wilfried, it is not only possible to us normal portland concrete
i recommend it strongly. Only normal concrete can be handled without
the asistance of a concrete quality lab and is designed to be handled by
ordinary construction workers, tolerating certain level of unperfection.
in the process. It is widly the same thing as normal steel welding and
stainless steel welding. First is for average people with garage equipment
last for specialists.

Water tightness is not the big issue as you imagine. First of all a certain
level of cracks is part of concrete construction as stress is part of
welding. (ask a concrete ingeneer). So if you do no coating you will have
a submarine hull filtering drops in. This is a problem over years as
sulfatation weakens concrete structure over time (3-5 decades)also
filtering
brings your steelbars in contact with seawater - rusting - weakening.
You can do nothig against this in dam construction, submarine tunnel
construction, oil rig construction as you can not cover the whole
struckture
with a perfect watertight coat, what engineers do is having a look at
the structural integrity over time, living well with the problems of
concrete under direct salt water contact and pressure.
For a submarine you can get easily rid of this type of long term problems
covering it with a millimeter of tarmac based coating enforced with glass
fiber net (type moskito).
Worked perfectly over decades in my case no filtration at all.

Greetings,

Wilfried



> 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
>
>
>
>
>
> __________________________________
> Discover Yahoo!
> Stay in touch with email, IM, photo sharing and more. Check it out!
> http://discover.yahoo.com/stayintouch.html
>
>
>
> ************************************************************************
> ************************************************************************
> ************************************************************************
> The personal submersibles mailing list complies with the US Federal
> CAN-SPAM Act of 2003.  Your email address appears in our database
> because either you, or someone you know, requested you receive messages
> from our organization.
>
> If you want to be removed from this mailing list simply click on the
> link below or send a blank email message to:
> 	removeme-personal_submersibles@psubs.org
>
> Removal of your email address from this mailing list occurs by an
> automated process and should be complete within five minutes of
> our server receiving your request.
>
> PSUBS.ORG
> PO Box 311
> Weare, NH  03281
> 603-529-1100
> ************************************************************************
> ************************************************************************
> ************************************************************************
>




************************************************************************
************************************************************************
************************************************************************
The personal submersibles mailing list complies with the US Federal
CAN-SPAM Act of 2003.  Your email address appears in our database
because either you, or someone you know, requested you receive messages
from our organization.

If you want to be removed from this mailing list simply click on the
link below or send a blank email message to:
	removeme-personal_submersibles@psubs.org

Removal of your email address from this mailing list occurs by an
automated process and should be complete within five minutes of
our server receiving your request.

PSUBS.ORG
PO Box 311
Weare, NH  03281
603-529-1100
************************************************************************
************************************************************************
************************************************************************