[PSUBS-MAILIST] concrete
Jim Rudholm
jimrudholm at gmail.com
Tue Apr 15 10:31:06 EDT 2014
Marc,
I wanted a catamaran for stability. The design gave an easy layup of both
cross wires and plaster mesh. It was also easy to plaster as there were no
sharp corners. Thickness was about 5/8", I don't remember the weight. I
had a book by Pier Luigi Nervi showing one of his folded roof designs for a
Turin Exhibition hall. There was also a landing craft built by the R. G.
LeTourneau Co. with the bottom segments of pipe welded into a corrugated
pattern. It did not need longitudinal framing or stringers, just transverse
bulkheads.
My barge did not have any frames, just light steel sheet 'C' section deck
beams on 16" centers for the plywood deck. I doubt the solid f-c bulwarks
were necessary. It was sold and was made into a houseboat for one of the
central California lakes.
JimR
On Mon, Apr 14, 2014 at 7:46 PM, Marc de Piolenc <piolenc at archivale.com>wrote:
> 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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