[PSUBS-MAILIST] concrete
Marc de Piolenc
piolenc at archivale.com
Mon Apr 14 22:46:27 EDT 2014
I had blundered into that photo collection some time ago, forgot to
bookmark it and couldn't find my way back. Thanks!
What was the reason for the wavy cross-section of the barge hull?
Marc
On 4/15/2014 1:43 AM, Jim Rudholm wrote:
> 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
> <mailto:jimrudholm at gmail.com>> wrote:
>
> Plenty of photos at:
> concretesubmarine.com <http://concretesubmarine.com>
>
>
> On Mon, Apr 14, 2014 at 6:27 AM, Marc de Piolenc
> <piolenc at archivale.com <mailto: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
> <http://overview.mail.yahoo.com?.src=iOS>>
>
>
> ------------------------------__------------------------------__------------
> *From: * Marc de Piolenc <piolenc at archivale.com
> <mailto:piolenc at archivale.com>>;
> *To: * <personal_submersibles at psubs.__org
> <mailto: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
> <http://overview.mail.yahoo.com?.src=iOS>>
>
> >
> >
> >
> ------------------------------__------------------------------__------------
> > *From: * Sean T. Stevenson <cast55 at telus.net
> <mailto:cast55 at telus.net> <javascript:return>>;
> > *To: * Personal Submersibles General Discussion
> > <personal_submersibles at psubs.__org
> <mailto: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 <mailto:piolenc at archivale.com>
> <javascript:return>> wrote:
> >>>
> >>> Subject: Re: [PSUBS-MAILIST] concrete
> >>> To: personal_submersibles at psubs.__org
> <mailto: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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