[PSUBS-MAILIST] concrete
hank pronk
hanker_20032000 at yahoo.ca
Sat Apr 12 20:58:47 EDT 2014
Marc,
If I am not mistaken, the strongest concrete mix uses 3/4in fractured rock with sand, Portland and water. I would think a sand mix without rock would not be as strong. Also think of the skill you would need to trowel a sphere. Anyways it is pretty crazy what Sean has shown us with the calculations.
Hank
--------------------------------------------
On Sat, 4/12/14, Marc de Piolenc <piolenc at archivale.com> wrote:
Subject: Re: [PSUBS-MAILIST] concrete
To: personal_submersibles at psubs.org
Received: Saturday, April 12, 2014, 5:58 AM
I never thought of it quite that way.
Sheesh, that makes concrete boat
advocacy look almost...well, normal.
Marc
On 4/12/2014 2:21 PM, Alan James wrote:
> Marc,
>>>Right now I feel like I'm one of a tiny deviant
cult .......
> Well you are an American of
French heritage hiding away on an obscure
> seldom visited South East Asian Island populated by man
hungry women
> & Moslem rebels.
> Alan
>
>
------------------------------------------------------------------------
> *From:* Marc de Piolenc <piolenc at archivale.com>
> *To:* personal_submersibles at psubs.org
> *Sent:* Saturday, April 12, 2014 1:42 PM
> *Subject:* Re: [PSUBS-MAILIST] concrete
>
> 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
> <mailto:piolenc at archivale.com>>
wrote:
> >
> > Subject: Re: [PSUBS-MAILIST] concrete
> > To: "Personal Submersibles General
Discussion"
> <personal_submersibles at psubs.org
<mailto: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
> <mailto:piolenc at archivale.com>>
> > wrote:
> > >
> > > Subject: Re:
[PSUBS-MAILIST] concrete
> > > To: "Personal Submersibles
General
> > Discussion" <personal_submersibles at psubs.org
> <mailto: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
> <mailto: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
> <mailto:Personal_Submersibles at psubs.org>
> > > http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>
> > >
> > >
> > >
_______________________________________________
> > > Personal_Submersibles mailing
list
> > > Personal_Submersibles at psubs.org
> <mailto: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
<mailto:Personal_Submersibles at psubs.org>
> > http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
> >
> >
> >
_______________________________________________
> > Personal_Submersibles mailing list
> > Personal_Submersibles at psubs.org
<mailto: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
<mailto: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