I found this searching on info on bentonite in geopolymers, and it also mentioned zeolite. Interesting microstructural analysis. Am not using fly ash, so maybe not directly useful, but perhaps some additional info to be gleaned.
Post by Karl playing with geopolymers on Jan 23, 2018 7:02:06 GMT -8
The addition of a few percent organic acids increases the reactivity of minerals with phosphoric acid by a multiple. Contrary to lye based geopolymers no pretreatment with the acid is required, just add the organic acid to the phosphoric acid. Particularly suitable for the geopolymerization by phosphoric acid are minerals with a high content of metal oxides. The strongest reactivity is shown by mafic (alkaline) and ultramafic minerals and minerals with high content of potassium oxide. In my experiments, Nepheline Syenite showed the strongest reactivity, probably because of the high grinding fineness of 400 mesh.
Post by esbjornaneer on Jan 29, 2018 0:29:25 GMT -8
Here are some articles Karl playing with geopolymers suggestes when I asked him about: 1 The percentage of binder to aggregate. 2 The aggregate mixed with the binder. 3 The quantity of water added to the mix. 4 Different materials in the binder.
and their affects on the finished piece of LTGS with regards to
i. ability to cope with heat, ii. insulation value, iii. surface hardness (abration/dent resistance), iv. and ability to span a void (like the roof of a large fire box). v. any other properties that change as a result of altering either one of 1-4
Post by coastalrocketeer on Nov 25, 2018 23:25:44 GMT -8
Interesting papers on geopolymers in the Egyptian pyramids... makes perfect sense to me that the main mass of the pyramids would be quarried stone, and the smooth outer facing was cast in place geopolymer, using the crushed powders/fines and aggregate sized materials of that or other regional stone quarrying. Second paper shows some pretty convincing (to me) photographic evidence of such construction.
And I presume acids and alkaline (potash solutions) could allow softer tools with grit to make some of the ‘machine marks” seen in other places that indicate large disc shaped cutting wheels were used on some work. Could have also softened surface layers for bronze chisel work (leave clump of wet ash overnight, where you want to chisel tomorrow and remove a decent amount of granite with a soft tool the next day... polish with wooden tools and sand as grit using similar softening agents? Definitely some sort of lost technologies going on, and interesting.
I am fairly convinced that a lot of the Central and South American megalithic stone work was also made with a combination of geopolymers and “stone-softening” techniques.
PREFACE TO THE 3rd EDITION. Not even a year has passed since a new edition of our “Production technical and chemical formulation” was needed. In this new, number three, edition, edited by prof. A. A. Kalachev, included many new recipes and production tips. There is one more small innovation. Proportions in most cases are translated into parts by weight, and only in cases where it was more convenient, they remained in grams. Due to space savings, the weight parts are indicated only by numbers without the letter h, which must be borne in mind when using the book. G. G. Brodersen. Leningrad, 1930
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