<div dir="ltr">Plenty of photos at:<div><a href="http://concretesubmarine.com">concretesubmarine.com</a></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Mon, Apr 14, 2014 at 6:27 AM, Marc de Piolenc <span dir="ltr"><<a href="mailto:piolenc@archivale.com" target="_blank">piolenc@archivale.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Fascinating. I think that counts as water pollution in Europe...<br>
<br>
Marc<br>
<br>
On 4/14/2014 6:52 PM, Joe Perkel wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Marc,<br>
<br>
Strictly from my foggy memory, but I believe it was scuttled.<br>
<br>
Joe<br>
<br>
Sent from Yahoo Mail for iPad <<a href="http://overview.mail.yahoo.com?.src=iOS" target="_blank">http://overview.mail.yahoo.<u></u>com?.src=iOS</a>><br>
<br>
<br>
------------------------------<u></u>------------------------------<u></u>------------<br>
*From: * Marc de Piolenc <<a href="mailto:piolenc@archivale.com" target="_blank">piolenc@archivale.com</a>>;<br>
*To: * <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.<u></u>org</a>>;<br>
*Subject: * Re: [PSUBS-MAILIST] concrete<br>
*Sent: * Mon, Apr 14, 2014 3:30:48 AM<br>
<br>
Really - it sank? Mind you, it did have walls 6 inches thick and very<br>
little freeboard. Any lives lost?<br>
<br>
Marc<br>
<br>
On 4/13/2014 10:35 PM, Joe Perkel wrote:<br>
> It seems to me that with reduced cost materials there is a tendency to<br>
> go big and unwieldy.<br>
> Wasn't that the case with that one fellows concrete sub yacht? It's on<br>
> the bottom of a lake somewhere if I recall.<br>
><br>
><br>
> Joe<br>
><br>
> Sent from Yahoo Mail for iPad <<a href="http://overview.mail.yahoo.com?.src=iOS" target="_blank">http://overview.mail.yahoo.<u></u>com?.src=iOS</a>><br>
<br>
><br>
><br>
> ------------------------------<u></u>------------------------------<u></u>------------<br>
> *From: * Sean T. Stevenson <<a href="mailto:cast55@telus.net" target="_blank">cast55@telus.net</a> <javascript:return>>;<br>
> *To: * Personal Submersibles General Discussion<br>
> <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.<u></u>org</a> <javascript:return>>;<br>
> *Subject: * Re: [PSUBS-MAILIST] concrete<br>
> *Sent: * Sun, Apr 13, 2014 6:16:35 AM<br>
><br>
> I ran that same 6' diameter 4" shell, but using an ultra high-performace<br>
> concrete with no aggregate, but with steel fiber reinforcement. Working<br>
> pressure came out to more than 1700 m. That said, while the compressive<br>
> strength of this stuff is 160 MPa, the tensile is only 8 MPa, so you<br>
> absolutely have to avoid putting this stuff in tension. Sphere may not<br>
> be an issue, but a cylindrical hull would probably require some sort of<br>
> pretensioned reinforcement. Results:<br>
><br>
><br>
><br>
><br>
> On 2014-04-12 21:52, Marc de Piolenc wrote:<br>
>> I had forgotten about the lubricant/plasticizer properties of fly ash.<br>
>><br>
>> Marc<br>
>><br>
>> On 4/13/2014 10:55 AM, hank pronk wrote:<br>
>>> Marc,<br>
>>> We don't get segregation at all, when pumping it we fill the wall and<br>
>>> then let it flow, I call it "ride the wave"<br>
>>> Also pumping the concrete helps hold the concrete together, it stays<br>
>>> in a cylinder shape until it hits the wave. We must use fly ash<br>
>>> because the aggregate and sand is washed so well there are no fines<br>
>>> left. The jagged sand won't flow through the hose. Fly ash is like<br>
>>> little ball bearings and makes it flow through the hose. These are<br>
>>> the things that make me think a mold is the way to go. Four inches<br>
>>> wall thickness would be a breeze for this mix.<br>
>>> That makes sense that the rock is a cheap filler. I would still use<br>
>>> the pea gravel mix, I have made a test panel and I drove my bob-cat<br>
>>> over a 2in thick 4by4 panel with no breakage. I know, very<br>
>>> scientific .lol<br>
>>><br>
>>> Hank<br>
>>> ------------------------------<u></u>--------------<br>
>>> On Sat, 4/12/14, Marc de Piolenc <<a href="mailto:piolenc@archivale.com" target="_blank">piolenc@archivale.com</a><br>
<javascript:return>> wrote:<br>
>>><br>
>>> Subject: Re: [PSUBS-MAILIST] concrete<br>
>>> To: <a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.<u></u>org</a> <javascript:return><br>
>>> Received: Saturday, April 12, 2014, 10:40 PM<br>
>>><br>
>>> Actually, all else being equal, using<br>
>>> only fine aggregate (sand) will give a stronger mix. Coarse<br>
>>> aggregate is needed mainly to make the mix affordable - as<br>
>>> bulk filler, in other words - and also for decorative effect<br>
>>> in some applications where the fresh concrete is brushed to<br>
>>> show off the aggregate.<br>
>>><br>
>>> You have to be careful, in very high-strength applications,<br>
>>> to make sure that the coarse aggregate is chemically inert<br>
>>> with respect to the cement matrix. Some siliceous aggregate<br>
>>> will weaken the concrete in the long term by reacting slowly<br>
>>> with the matrix long after cure.<br>
>>><br>
>>> Confusingly, very fine silica incorporated in the form of<br>
>>> fly ash, rice husk ash or silica fume can give a<br>
>>> super-HIGH-strength mix. The reason for the effect is that<br>
>>> the very fine silica reacts with the alkali formed DURING<br>
>>> cure and actually strengthens the cement matrix.<br>
>>> Unfortunately, much of the fly-ash and volcanic ash cement<br>
>>> on the market is too coarsely ground to harness this<br>
>>> effect.<br>
>>><br>
>>> Best,<br>
>>> Marc de Piolenc<br>
>>> Ferrocement freak<br>
<br>
><br>
><br>
><br>
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