|
|
Post by coastalrocketeer on Jan 6, 2018 14:21:28 GMT -8
That’s good stuff. So after soaking the ashes in water can you just re dry it or should it be used immediately? Search the forum for discussions of fly ash and you will find Karl's past posts on geopolymers that cover fly ash based geopolymers. |
|
|
|
Post by coastalrocketeer on Jan 7, 2018 4:57:45 GMT -8
The fly ash geopolymers can harden rather quickly once wetted, if I understand correctly...
|
|
|
|
Post by boscovius on Mar 19, 2021 14:32:01 GMT -8
"The binder can be dried and then milled to a powder for storage or shipping."
Karl, I'm doing my best to read up on all things Geopolymer and my level of understanding has grown considerably, but I'm a little confused about this. Wouldn't you mean the mineral and the lye could be stored together indefinitely in a dry state, then activated with water and blended with the aggregate? I don't understand how the reaction can take place, then the resultant dry binder be ground up and stored for future use. Hasn't it's chemical energy already been spent?
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Mar 20, 2021 2:46:37 GMT -8
Hasn't it's chemical energy already been spent? Chemical energy is consumed only when every donor is facing a recipient in a suitable environment. |
|
|
|
Post by boscovius on Mar 21, 2021 12:22:15 GMT -8
Ok, granted that not all of the chemical reactions possible have taken place until the binder has been mixed with the dry bulk of the recipe. But what is the benefit of reacting the binder, drying, then grinding it back to powder? BTW. Special ordered 35 lbs of cliniptilolite powder today from the farm store. $14.00.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Mar 21, 2021 13:34:31 GMT -8
But what is the benefit of reacting the binder, drying, then grinding it back to powder? "The binder can be dried and then milled to a powder for storage or shipping." A high energy ball mill could be used to do the chemistry dry without a solvent. |
|
|
|
Post by boscovius on Mar 21, 2021 14:06:15 GMT -8
Ok, then the stored binder can then be directly mixed with a suitable aggregate, cast and allowed to cure. I can see where this may be of greater value on a commercial scale. Probably not so much for us hobbyists. Thank you for the feedback Karl. On a side note, I happen to have in my possession a large bag of fillers Earth in the form of 2 to 5 mm nuggets. Would this have any value as a geopolymer aggregate mixed in a pdz + NaOH binder?
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Mar 22, 2021 2:46:28 GMT -8
On a side note, I happen to have in my possession a large bag of fillers Earth in the form of 2 to 5 mm nuggets. Would this have any value as a geopolymer aggregate mixed in a pdz + NaOH binder? is very difficult to handle due to its extremely high water demand and the resulting high shrinkage. The likelihood of failure is very high.
On the other hand, the result can be extremely low heat conduction, which may be worth the hassle.
High shrinkage can be countered by adding fibers and processing in thin layers.
Composites can be very powerful.
|
|
