[PSUBS-MAILIST] concrete

Mon Apr 14 14:33:39 EDT 2014

the concrete yacht submarine is at the bottom of Attersee, Austria, in 50 m depth and is a turist atraction now. As far as Wilfried the builder told me it sank because some buglars damaged the hatch and after a long time rain came in and one day it sank. No body was on the boat, because it was in a kind of winter pause.
In youtube there are several videos showing the boat. Search under Atterse u boot.
Best wishes
Juergen

Jim Rudholm <jimrudholm at gmail.com> schrieb am 12:45 Montag, 14.April 2014:

 Here are a few photos of my party barge, 26' x 8', built in 1968.  Also some photos of  Martin Iron's Fibersteel mold and a hull in West Sacramento, CA.  I had returned from two years with the Navy in Japan and had picked up several cargo parachutes at a surplus store. These made for an interesting  air inflated building, they were treated with a plastic preservative coating, but the UV eventually deteriorated the nylon.

https://plus.google.com/photos/110939032764686627267/albums/5294994060907444593?banner=pwa

JimR

On Mon, Apr 14, 2014 at 7:21 AM, Jim Rudholm <jimrudholm at gmail.com> wrote:

Plenty of photos at:
>concretesubmarine.com
>
>
>
>On Mon, Apr 14, 2014 at 6:27 AM, Marc de Piolenc <piolenc at archivale.com> wrote:
>
>Fascinating. I think that counts as water pollution in Europe...
>>
>>Marc
>>
>>On 4/14/2014 6:52 PM, Joe Perkel wrote:
>>
>>Marc,
>>>
>>>Strictly from my foggy memory, but I believe it was scuttled.
>>>
>>>Joe
>>>
>>>Sent from Yahoo Mail for iPad <http://overview.mail.yahoo.com?.src=iOS>
>>>
>>>
>>>------------------------------------------------------------------------
>>>*From: * Marc de Piolenc <piolenc at archivale.com>;
>>>*To: * <personal_submersibles at psubs.org>;
>>>*Subject: * Re: [PSUBS-MAILIST] concrete
>>>*Sent: * Mon, Apr 14, 2014 3:30:48 AM
>>>
>>>Really - it sank? Mind you, it did have walls 6 inches thick and very
>>>little freeboard. Any lives lost?
>>>
>>>Marc
>>>
>>>On 4/13/2014 10:35 PM, Joe Perkel wrote:
>>> > It seems to me that with reduced cost materials there is a tendency to
>>> > go big and unwieldy.
>>> > Wasn't that the case with that one fellows concrete sub yacht? It's on
>>> > the bottom of a lake somewhere if I recall.
>>> >
>>> >
>>> > Joe
>>> >
>>> > Sent from Yahoo Mail for iPad <http://overview.mail.yahoo.com?.src=iOS>
>>>
>>> >
>>> >
>>> > ------------------------------------------------------------------------
>>> > *From: * Sean T. Stevenson <cast55 at telus.net <javascript:return>>;
>>> > *To: * Personal Submersibles General Discussion
>>> > <personal_submersibles at psubs.org <javascript:return>>;
>>> > *Subject: * Re: [PSUBS-MAILIST] concrete
>>> > *Sent: * Sun, Apr 13, 2014 6:16:35 AM
>>> >
>>> > I ran that same 6' diameter 4" shell, but using an ultra high-performace
>>> > concrete with no aggregate, but with steel fiber reinforcement.  Working
>>> > pressure came out to more than 1700 m.  That said, while the compressive
>>> > strength of this stuff is 160 MPa, the tensile is only 8 MPa, so you
>>> > absolutely have to avoid putting this stuff in tension.  Sphere may not
>>> > be an issue, but a cylindrical hull would probably require some sort of
>>> > pretensioned reinforcement.  Results:
>>> >
>>> >
>>> >
>>> >
>>> > On 2014-04-12 21:52, Marc de Piolenc wrote:
>>> >> I had forgotten about the lubricant/plasticizer properties of fly ash.
>>> >>
>>> >> Marc
>>> >>
>>> >> On 4/13/2014 10:55 AM, hank pronk wrote:
>>> >>> Marc,
>>> >>> We don't get segregation at all, when pumping it we fill the wall and
>>> >>> then let it flow, I call it "ride the wave"
>>> >>> Also pumping the concrete helps hold the concrete together, it stays
>>> >>> in a cylinder shape until it hits the wave. We must use fly ash
>>> >>> because the aggregate and sand is washed so well there are no fines
>>> >>> left.  The jagged sand won't flow through the hose.  Fly ash is like
>>> >>> little ball bearings and makes it flow through the hose.  These are
>>> >>> the things that make me think a mold  is the way to go.  Four inches
>>> >>> wall thickness would be a breeze for this mix.
>>> >>> That makes sense that the rock is a cheap filler.  I would still use
>>> >>> the pea gravel mix, I have made a test panel and I drove my bob-cat
>>> >>> over a 2in thick 4by4 panel with no breakage.  I know, very
>>> >>> scientific .lol
>>> >>>
>>> >>> Hank
>>> >>> --------------------------------------------
>>> >>> On Sat, 4/12/14, Marc de Piolenc <piolenc at archivale.com
>>><javascript:return>> wrote:
>>> >>>
>>> >>>  Subject: Re: [PSUBS-MAILIST] concrete
>>> >>>  To: personal_submersibles at psubs.org <javascript:return>
>>> >>>  Received: Saturday, April 12, 2014, 10:40 PM
>>> >>>
>>> >>>  Actually, all else being equal, using
>>> >>>  only fine aggregate (sand) will give a stronger mix. Coarse
>>> >>>  aggregate is needed mainly to make the mix affordable - as
>>> >>>  bulk filler, in other words - and also for decorative effect
>>> >>>  in some applications where the fresh concrete is brushed to
>>> >>>  show off the aggregate.
>>> >>>
>>> >>>  You have to be careful, in very high-strength applications,
>>> >>>  to make sure that the coarse aggregate is chemically inert
>>> >>>  with respect to the cement matrix. Some siliceous aggregate
>>> >>>  will weaken the concrete in the long term by reacting slowly
>>> >>>  with the matrix long after cure.
>>> >>>
>>> >>>  Confusingly, very fine silica incorporated in the form of
>>> >>>  fly ash, rice husk ash or silica fume can give a
>>> >>>  super-HIGH-strength mix. The reason for the effect is that
>>> >>>  the very fine silica reacts with the alkali formed DURING
>>> >>>  cure and actually strengthens the cement matrix.
>>> >>>  Unfortunately, much of the fly-ash and volcanic ash cement
>>> >>>  on the market is too coarsely ground to harness this
>>> >>>  effect.
>>> >>>
>>> >>>  Best,
>>> >>>  Marc de Piolenc
>>> >>>  Ferrocement freak
>>>
>>> >
>>> >
>>> >
>>> > _______________________________________________
>>> > Personal_Submersibles mailing list
>>> > Personal_Submersibles at psubs.org <javascript:return>
>>> > http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>>> >
>>>
>>>--
>>>Archivale catalog: http://www.archivale.com/catalog
>>>Polymath weblog: http://www.archivale.com/weblog
>>>Translations (ProZ profile): http://www.proz.com/profile/639380
>>>Translations (BeWords profile): http://www.bewords.com/Marc-dePiolenc
>>>Ducted fans: http://massflow.archivale.com/
>>>_______________________________________________
>>>Personal_Submersibles mailing list
>>>Personal_Submersibles at psubs.org <javascript:return>
>>>http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>>>
>>>
>>>
>>>_______________________________________________
>>>Personal_Submersibles mailing list
>>>Personal_Submersibles at psubs.org
>>>http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>>>
>>>
>>-- 
>>Archivale catalog: http://www.archivale.com/catalog
>>Polymath weblog: http://www.archivale.com/weblog
>>Translations (ProZ profile): http://www.proz.com/profile/639380
>>Translations (BeWords profile): http://www.bewords.com/Marc-dePiolenc
>>Ducted fans: http://massflow.archivale.com/
>>_______________________________________________
>>Personal_Submersibles mailing list
>>Personal_Submersibles at psubs.org
>>http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>>
>

_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20140414/7895c518/attachment-0001.html>