[PSUBS-MAILIST] concrete
hank pronk
hanker_20032000 at yahoo.ca
Fri Apr 11 21:50:44 EDT 2014
Marc,
I built a concrete hull for a sub once. I took a 500 gal propane tank and split it like a hot dog bun and mad a mold from it. The inside mold floated in the concrete and the hull thickness was thin at the top and thick on the bottom. It was a failure but when I opened the mold the outside of the hull was perfect. It was a cheap experiment. Now I know how to do it. I work with concrete all the time in different ways. My company does concrete cutting, concrete demolition and concrete line pumping. My problem is, I am not a mathematician or an engineer. I like the idea, but can not implement it due the lack of engineering. There is no room for guessing with submarines.
Hank
--------------------------------------------
On Fri, 4/11/14, Marc de Piolenc <piolenc at archivale.com> wrote:
Subject: Re: [PSUBS-MAILIST] concrete
To: personal_submersibles at psubs.org
Received: Friday, April 11, 2014, 9:42 PM
I think I will post those reports to
Dropbox.
Right now I feel like I'm one of a tiny deviant cult of
Portland cement
cultists within the psubs community. Maybe the reports will
help me
proselytize new adherents...
Marc
On 4/12/2014 9:03 AM, hank pronk wrote:
> Marc,
> Not only is it dirt cheap, concrete is so easy to form.
The material cost for a 6 foot sphere is in the hundreds,
not thousands. Hank
> --------------------------------------------
> On Fri, 4/11/14, Marc de Piolenc <piolenc at archivale.com>
wrote:
>
> Subject: Re: [PSUBS-MAILIST] concrete
> To: "Personal Submersibles General
Discussion" <personal_submersibles at psubs.org>
> Received: Friday, April 11, 2014, 8:26
PM
>
> I don't have hard numbers, but
> remember that resistance to mostly
> compressive loading is a structural
STABILITY problem. Most
> practical
> steel structures buckle under
compression long before
> reaching their
> actual compression limit. Concrete has
an advantage there
> due to its
> stiffness - the NCEL tests suggest
that it comes much closer
> to using
> its full compressive strength.
>
> That said, my primary interest in
concrete is due to its
> cost and ease
> of maintenance.
>
> Marc
>
> PS. If anybody is interested, I will
add the relevant
> reports that I
> have to my public Dropbox folder and
post the link.
>
> On 4/12/2014 3:15 AM, hank pronk
wrote:
> > A six foot od sphere built in
1.25in thick steel would
> be equal in weight to 4in thick
concrete. I would not
> ever expect 4in concrete to compare to
1.25 steel.
> But, it would be interesting to know
where the concrete
> stands in comparison.
> > Hank
> >
--------------------------------------------
> > On Fri, 4/11/14, Marc de Piolenc
<piolenc at archivale.com>
> wrote:
> >
> > Subject: Re:
[PSUBS-MAILIST] concrete
> > To: "Personal
Submersibles General
> Discussion" <personal_submersibles at psubs.org>
> > Received:
Friday, April 11, 2014, 9:59
> AM
> >
> > A huge amount of
work was done on
> > concrete for
pressure-resisting
> structures, including long
> > term, deep
exposure tests, by the US
> Naval Civil Engineering
> > Laboratory. Most
of the reports are
> available for
> > downloading free
of charge from DTIC.
> >
> > Excellent
results were achieved with
> concrete having NO
> > reinforcement.
There has been limited
> work done with
> > prestressed
concrete and even less
> done with reinforced
> > concrete and
ferrocement, which can
> reasonably be expected
> > to give much
more efficient and
> distortion-tolerant
> > structures.
> >
> > Marc
> >
> > On 4/11/2014
8:25 PM, hank pronk
> wrote:
> > > A cheap
alternative to a super
> strong sphere hull is
> > re-enforced
concrete. I feel like
> hiding under a blanket
> > while I say
this,lol. I know it
> is way out there, but
> > concrete is
super strong under
> compression. It is not
> > so good for
impact resistance.
> Concrete is a very easy
> > material to work
with and form into a
> sphere shape. I
> > have no idea
what thickness would be
> needed. Properly
> > engineered I
would trust it.
> > > Hank
> > >
> > >
> _______________________________________________
> > >
Personal_Submersibles mailing
> list
> > > Personal_Submersibles at psubs.org
> > > http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
> > >
> >
> > -- 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/
> > _______________________________________________
> > Personal_Submersibles
mailing list
> > Personal_Submersibles at psubs.org
> > http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
> >
> >
> >
_______________________________________________
> > Personal_Submersibles mailing
list
> > Personal_Submersibles at psubs.org
> > http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
> >
>
> --
> 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/
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>
>
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>
--
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/
_______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
More information about the Personal_Submersibles
mailing list