[PSUBS-MAILIST] concrete
Jim Rudholm
jimrudholm at gmail.com
Mon Apr 14 13:43:17 EDT 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
>>>
>>> >
>>> >
>>> >
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>>> >
>>>
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>> --
>> 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/
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