[PSUBS-MAILIST] concrete

Marc de Piolenc piolenc at archivale.com
Sat Apr 12 05:58:50 EDT 2014 

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/

More information about the Personal_Submersibles mailing list