Simple and Straight away LTGS Binder
Nov 15, 2017 8:33:38 GMT -8
coastalrocketeer, wiscojames, and 3 more like this
Post by Deleted on Nov 15, 2017 8:33:38 GMT -8
The Low Temperature Geopolymeric Setting (LTGS) is described in the following paper:
www.geopolymer.org/fichiers_pdf/ltgs.pdf
The LTGS technology works with virtually any kind of alumino-silicate clay,
but at best with high alumina clays.
In clays with lower alumina content a high content of other metal oxides
like iron oxide is also benefical as the metall oxides reduce the amount of quartz in the clay.
It works also with other micronized alumino-silicates like fly ash, grog, hard stone flour.
Clinoptilolite a natural zeolite as aggregate requires a LTGS binder with 10% lye of the total dry mass to get strong.
A LTGS binder contains 50% by weight of NaOH or KOH and 50% clay.
Mixing:
Mix dry clay with dry lye (flakes, pearls or pellets).
Slowly add small amounts of water and stirr.
Add only enough water to dissolve the lye completely.
Due to the high amount of lye only a quite small amount of water
is required to get a smooth paste, less than for the clay alone.
The result should be a paste, not a liquid.
Be careful because the mixture will get very hot.
If you add to much water at once the temperature of the mixture
may reach about 150°C/302°F and then hot steam will throw lye particles around.
In this way a LTGS binder can be made without the help of an acid.
After the paste has cooled down it can be used as it is.
However keeping the paste close to 100°C/212°C in a water bath
for some time will increase the dissolution and thus improve it significantly.
For low purity clays the use of high alumina clay for the binder may improve the result
significantly while raising the costs only moderately.
The binder can be dried and then milled to a powder for storage or shipping.
LTGS mixtures with low purity (low metal oxide content) and therefore very high quartz content may be susceptible to thermal shock at high temperatures.
One or two sheets of dissolved toilet paper per kg can prevent the propagation of microcracks into large cracks and, as a side effect, increase the insulating effect
www.geopolymer.org/fichiers_pdf/ltgs.pdf
The LTGS technology works with virtually any kind of alumino-silicate clay,
but at best with high alumina clays.
In clays with lower alumina content a high content of other metal oxides
like iron oxide is also benefical as the metall oxides reduce the amount of quartz in the clay.
It works also with other micronized alumino-silicates like fly ash, grog, hard stone flour.
Clinoptilolite a natural zeolite as aggregate requires a LTGS binder with 10% lye of the total dry mass to get strong.
A LTGS binder contains 50% by weight of NaOH or KOH and 50% clay.
Mixing:
Mix dry clay with dry lye (flakes, pearls or pellets).
Slowly add small amounts of water and stirr.
Add only enough water to dissolve the lye completely.
Due to the high amount of lye only a quite small amount of water
is required to get a smooth paste, less than for the clay alone.
The result should be a paste, not a liquid.
Be careful because the mixture will get very hot.
If you add to much water at once the temperature of the mixture
may reach about 150°C/302°F and then hot steam will throw lye particles around.
In this way a LTGS binder can be made without the help of an acid.
After the paste has cooled down it can be used as it is.
However keeping the paste close to 100°C/212°C in a water bath
for some time will increase the dissolution and thus improve it significantly.
For low purity clays the use of high alumina clay for the binder may improve the result
significantly while raising the costs only moderately.
The binder can be dried and then milled to a powder for storage or shipping.
LTGS mixtures with low purity (low metal oxide content) and therefore very high quartz content may be susceptible to thermal shock at high temperatures.
One or two sheets of dissolved toilet paper per kg can prevent the propagation of microcracks into large cracks and, as a side effect, increase the insulating effect
) or grind old brick & tiles. My results are not encouraging but nor are my resources something you can call "normal".