Wade Blocker on fri 16 nov 01
Somewhere in the past CM had recipes containing cement. Mia in overcast ABQ
Dave Finkelnburg on fri 16 nov 01
Melinda,
From "Ash Glazes" by Robert Tichane, cement is nominally 62.5% CaO, 7.5%
Al2O3, 22.5% SiO2, remainder iron, magnesium, sulfur, alkali, LOI. Seger
formula is 1 mole CaO: 0.07 moles Al2O3: 0.34 moles SiO2.
Tichane suggests as a starting point substituting cement one for one for
wood ash in any glaze recipe. Just remember, the cement has one to 2% iron,
almost no potassium, unlike wood ash.
Good testing!
Dave Finkelnburg, in from watching the stars on a crystal-clear
Idaho night
From: Ron Collins
Does anyone have a glaze recipe using cement that I could play with before
Lowell comes on Sunday?
Ron Collins on fri 16 nov 01
I have looked in the archives, but only could find 3 recipes from Alisa =
Clausen and they all contain frit 25. Does anyone have a glaze recipe =
using cement that I could play with before Lowell comes on Sunday? I =
just thought of using it as a possibility, since we are confining =
ourselves to only local products. Does anyone have anything in the 06 =
to 5-6 range that you would post today? I have to fire my tests =
tomorrow, if possible. I would appreciate any input...thanks, Melinda
Ababi on sat 17 nov 01
I made some tests of adding cement to glaze.
In my stoneware page you can see the best result. It was applied on
Mottled buff claybody. The result Changed the appearance of the
claybody, Inside the ware to very mottled while in the back was
thinner and smooth brown.
As using cement, I did not mind using borax for extra flux as I dumped
the glaze after using it. My adviser Yehuda Koren has told me, I do not
remember If he has done it or some one else,perhaps in Russia, about
using torches in order to create kind of glaze out of cement coat
inside a building for a decoration.
Back to the glaze.
You are right Dave, cement is another material. High enough, perhaps ^7
or higher it will melt by itself to kind of yellowish crackled glass
like glaze, We tried it once where I learned the high there was 1240C
2,264F.
I saw an imported ware from Spain was cement just brushed on it. Seems
to me that it was done after firing in order to make it kind of
original, good for tourists. Yet doing it with a brush before firing
can be interesting.
Here is the recipe, I tried to use as much cement that could work. I
tried in raku and 04 too, without great success.
Ababi's concrete for ^6
=======================
Portland Cement..... ................. 22.00 22.00%
MAGNESIUM CARBONATE. 8.00 8.00%
BORAX............... ........................ 15.00 15.00%
KAOLIN...................................... 20.00 20.00%
QUARTZ/FLINT....................... 15.00 15.00%
CRYOLITE................................. 20.00 20.00%
========
100.00
Writing again the recipe, with my present knowledge, I think the "high
mottled" caused by the high cryolite.
Once when I tried to use coal ash, I took a proven recipe, and changed
materials. You can do it with any glaze that has a lot of CaO and any
of the oxides Dave has wrote here.
Tichane wrote his book before using ceramic software at least for as a
simple to reach to everyone. The way I offer you makes it much easier,
easier to control.
Ababi Sharon
Kibbutz Shoval- Israel
Glaze addict
sharon@shoval.org.il
http://members4.clubphoto.com/ababi306910/
http://www.milkywayceramics.com/cgallery/asharon.htm
http://www.israelceramics.org/
---------- Original Message ----------
>Melinda,
> From "Ash Glazes" by Robert Tichane, cement is nominally 62.5% CaO,
>7.5%
>Al2O3, 22.5% SiO2, remainder iron, magnesium, sulfur, alkali, LOI.
>Seger
>formula is 1 mole CaO: 0.07 moles Al2O3: 0.34 moles SiO2.
> Tichane suggests as a starting point substituting cement one for
>one for
>wood ash in any glaze recipe. Just remember, the cement has one to 2%
>iron,
>almost no potassium, unlike wood ash.
> Good testing!
> Dave Finkelnburg, in from watching the stars on a crystal-clear
>Idaho night
>From: Ron Collins
>Does anyone have a glaze recipe using cement that I could play with
>before
>Lowell comes on Sunday?
Edouard Bastarache on sat 17 nov 01
Hello Melinda,
glaze bases from Richard Behrens' Glaze Projects:
A- Cement Glaze C/04:
Portland Cement 17.0
Pemco Frit #25 78.7
Flint 4.3
B-Cement Glaze C/4:
Portland Cement 29.3
Pemco Frit #25 57.6
Flint 13.1
C-Cement Glaze C/9
Portland Cement 21.1
Pemco Frit #25 25.1
Zinc oxide 2.1
Whiting 2.7
Flint 49.0
Later,
Edouard Bastarache
Irreductible Quebecois
Indomitable Quebeker
Sorel-Tracy
Quebec
edouardb@sorel-tracy.qc.ca
http://sorel-tracy.qc.ca/~edouardb/
http://perso.wanadoo.fr/smart2000/index.htm
WALLY ASSELBERGHS on sun 18 nov 01
Melinda,
Found following receipt from Dennis Parks :
=20
1 part ball-milled Portland Cement=20
either that which has been washed out of a cement truck, and dried on =
the ground, or fresh from a sack, mixed with water, frozen, and thawed.
neither of these will later turn to concrete in the glaze bucket.
2 parts low-fire plastic clay
1 part sifted softwoodash, 80-mesh
Apply to dry clay. Snakeskin texture.
The iron-content of the low-fire clay sets the colour of the glaze from =
yellow-green to brown.
Cone 8-10 reduction.
This receipt is from his book "A potter's guide to raw glazing and oil =
firing", so this glaze is based on single-firing,=20
don't know if it is OK for biscuit ware.
Right after this, Dennis writes in his book :
"I recommend techniques, glazing with local materials, erecting dirt =
kilns, firing with discarded oil, and applying glaze to raw clay - =
because they are related means of investing an object with energies.
In how you treat that piece of clay lies your only clear and obvious =
artifact."
No more to say. =20
In these times of unbearable bushtalk, it feels good to read something =
sensefull.
Good luck with this receipt, let me know if it works out.......
Best regards
Walle.
wally.asselberghs@pi.be=20
> Message: 14
> Date: Fri, 16 Nov 2001 16:47:31 -0600
> From: Ron Collins >
Subject: glaze containing cement
> I have looked in the archives, but only could find 3 recipes from =
Alisa Clausen and they all >contain frit 25. Does anyone have a glaze =
recipe using cement that I could play with before >Lowell comes on =
Sunday? I just thought of using it as a possibility, since we are =
confining >ourselves to only local products. Does anyone have anything =
in the 06 to 5-6 range that you >would post today? I have to fire my =
tests tomorrow, if possible. I would appreciate any >input...thanks, =
Melinda
_________________________________________________________________________=
_____
Send postings to clayart@lsv.ceramics.org
wally.asselberghs@pi.be=20
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