Hi Wallace. I agree with you on the purpose of the knobs. Pouring geopolymer needs a closed mould and a high grade of fluidity (water) that course a lesser strength in the final material. The knobs are maybe what remains of a wood frame which help the stability of the "fresh" wall.
@saturno_boom3490 Жыл бұрын
It is interesting to note that (I tested it) if you pour a geopolymer in a wooden mould made with several wooden board, no trace of them will remain on the final setted material.
@WallaceSpirit Жыл бұрын
Andre Marq on facebook is my good friend and he is advancing the geopolymer knowledge... by doing tons of experiment and he proved my theory and even explain the difference between the concave and convex knobs. The concave are because of the wood post made to hold parts of the walls during construction. Convex knobs were long pieces of wood or metal that was inside the stone in order to vibrate them for a homogenous mix and solid backing... then when you remove them when the geopolymer is almost set... it makes a little knob
@saturno_boom3490 Жыл бұрын
@@WallaceSpirit I am also trying to do experimentation after reading "Geopolymer chemistry and applications" of prof Davidovits. First results are questionable (I do not have a laboratory, I play in my garage using simple tools and building what I need)😄. The products are almost "alkali activated" materials who can not stand the tests (boiling water test main) cited by Joseph Davidovits but the percentage of stable geopolymer matrix is increasing experiment by experiment and I hope soon to find a stable one. 😄
@WallaceSpirit Жыл бұрын
@@saturno_boom3490 With stone geopolymer there is no water boiling because of the exothermic reaction happening... its really just about the quantities. Contact ANDRE MARQ on faceboom brother. He is awesome and very advance with ancient temple geopolymer.
@saturno_boom3490 Жыл бұрын
@@WallaceSpirit I am already find him following your suggestion! Thanks Wallace! What I means with "boiling water test" is, after 28 days, put your supposed geopolyemer stone in a cup of boiling water for 15 minute. If it resists without breaking then you have very likely obtain a "true" geopolyemer with a complete geopolymeric 3D structure in which cations (Na+ K+ ...) are inside the net. You have also to measure the final pH of the water. If it remains almost neutral (7) it is another clue that you had realize a "true" geopolymer stable and with completed reacted chemistry.