[PSUBS-MAILIST] concrete
Jim Rudholm
jimrudholm at gmail.com
Mon Apr 14 10:21:57 EDT 2014
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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