Re: Fw: AAC in USA

["Bruno M." <brunom1@yucom.be>]

Dear Tom,
you wrote:
"Maybe CO2 bubbles could be incorporated from baking soda
and vinegar added later"
That will not work because your vinegar will neutralise some cement
or viceversa.

For those who have never seen AAC, Ytong- or Hebel- stones;
it is not really "concrete" as everbody knows it;
it is not a mixture from stones,sand and cement,it isn't even gray.

It is made in the following fasion:
A dry mixture from Sand, gypsum, lime,cement and aluminium ( fine metalpowder)
is mixed with some water. Put in a big casting form; afterwards it is cut and
than autoclaved.

How are the bubles come into it?
The fine aluminium powder reacts with mostly the lime and the water ( high PH)
to form hydrogen ( H2) bubbles ( not air-bubbels), and because the mass
is already stiffening at that point, the bubbels can't escape.
Result is a white foamlike but stonehard material, that when dry, can float 
on water.
A common building material in europe known for decades. You can saw it by hand,
and you don't need a mortar to build a wall with it,
you can easiely glue them together.

It has good thermal values, ( isolation value and low thermal-mass);
but if it's a good refractory material I don't know, i don't believe it,
but I haven't don any experiment with it in that way.

Hope this was of any help.

Greets
Bruno Meersman.
(from Belgium)

=============================
At 12:28 21/08/2002 -0600, TOM wrote:
>Dear Dean and all:
>
>I inquired about the "floating concrete" with my friend Axel Weber in
>Germany and he sent me the following.  Apparently the
>bricks are "autoclaved aerated concrete".  This suggests a mixing process in
>which air is dissolved into the concrete in an autoclave and the pressure is
>released to form bubbles.
>
>I don't know if you could aerate concrete - might require a small amount of
>gluten or other chemical to hold the bubbles, but I doubt if you want a high
>pressure process.  Maybe CO2 bubbles could be incorporated from baking soda
>and vinegar added later.  Sounds like a little experimentation could make a
>nifty insulation product.
>
>What is the highest temperature that concrete can stand before it begins to
>break down?
>
>Yours truly,       TOM REED           BEF STOVEWORKS
>
>----- Original Message -----
>From: "Weber-WTM" <Weber-WTM@t-online.de>
>To: "Thomas B Reed (E-Mail)" <tombreed@attbi.com>
>Sent: Wednesday, August 21, 2002 6:07 AM
>Subject: WG: AAC in USA
>
>
> >
> >
> > -----Ursprüngliche Nachricht-----
> > Von: Adele.Reggiori@ytong.com [mailto:Adele.Reggiori@ytong.com]Im
> > Auftrag von International@ytong.com
> > Gesendet: Mittwoch, 21. August 2002 13:56
> > An: weber-wtm@t-online.de
> > Betreff: AAC in USA
> >
> >
> > Autoclaved Aerated Concrete (AAC) in USA
> >
> > Dear Sir:
> >
> > Thank you for your interest in YTONG products.
> >
> > The YTONG plant in Haines City, Florida  is not in operation at present.
>We
> > do not know whether the owner, Readymix Industries Atlanta, intends to
> > resume production.
> >
> > You can get AAC products from the following manufacturers:
> >
> >    BABB INTERNATIONAL - HEBEL
> >    PAAC DIVISION
> >    6600 Highlands Parkway
> >    Smyrna, GA 30082
> >
> >    bp@babb.com
> >    770-308-1500 Bob Phillips
> >    www.babb.com/aac
> >
> >    ACCO Aerated Concrete Systems, Inc.
> >    3351 West Orange Blossom Trail
> >    Apopka, FL 32712
> >
> >    aacinfo@accoac.com
> >    1-888-901-ACCO(2226) - FAX 407-884-5111
> >    www.acco-aac.com
> >
> > Sincerely yours,
> >
> > YTONG International GmbH
> > Hornstr. 3, 80797 München, Germany
> > Tel. (++49.89) 306 14 112
> > Fax (++49.89) 306 14 117
> > international@ytong.com
> > www.ytong.com
> >
> >
> >
> >
> >
> >
>
>
>
>-
>Stoves List Archives and Website:
>http://www.crest.org/discussion/stoves/200204/
>http://crest.org/discussiongroups/resources/stoves/
> >
>Stoves List Moderators:
>Ron Larson, ronallarson@qwest.net
>Elsen L. Karstad, elk@wananchi.com www.chardust.com
> >
>List-Post: <mailto:stoves@crest.org>
>List-Help: <mailto:stoves-help@crest.org>
>List-Unsubscribe: <mailto:stoves-unsubscribe@crest.org>
>List-Subscribe: <mailto:stoves-subscribe@crest.org>
> >
>Sponsor the Stoves List: http://www.crest.org/discuss3.html
>-
>Other Biomass Stoves Events and Information:
>http://www.bioenergy2002.org
>http://www.crest.org/articles/static/1/1010424940_7.html Bioenergy
>http://www.crest.org/articles/static/1/1011975339_7.html Gasification
>http://www.crest.org/articles/static/1/1011975672_7.html Carbon
> >
>For information about CHAMBERS STOVES
> >http://www.repp.org/discussiongroups/resources/stoves/Chambers/Chambers.htm

-----------------------------------------------------
Reply's to BrunoM1@yucom.be


-
Stoves List Archives and Website:
http://www.crest.org/discussion/stoves/200204/
http://crest.org/discussiongroups/resources/stoves/
>
Stoves List Moderators:
Ron Larson, ronallarson@qwest.net
Elsen L. Karstad, elk@wananchi.com www.chardust.com
>
List-Post: <mailto:stoves@crest.org>
List-Help: <mailto:stoves-help@crest.org>
List-Unsubscribe: <mailto:stoves-unsubscribe@crest.org>
List-Subscribe: <mailto:stoves-subscribe@crest.org>
>
Sponsor the Stoves List: http://www.crest.org/discuss3.html
-
Other Biomass Stoves Events and Information:
http://www.bioenergy2002.org
http://www.crest.org/articles/static/1/1010424940_7.html Bioenergy
http://www.crest.org/articles/static/1/1011975339_7.html Gasification
http://www.crest.org/articles/static/1/1011975672_7.html Carbon
>
For information about CHAMBERS STOVES
>http://www.repp.org/discussiongroups/resources/stoves/Chambers/Chambers.htm