jean63 wrote:Regarding resistance to humidity, a friend recently told me that I immersed 24 blocks 2 hours: 1 concrete block and 1 aerated concrete. After immersion, the 2 blocks were split ... the concrete block was completely soggy unlike aerated concrete. (25-30% penetration not all sides but the heart was kept dry)
What! a completely soggy breeze block after 24 hours in the water ..... I can't believe it .....
Well, I believe in it, concrete blocks are real sponges because they are full of micro holes. In order for the concrete block to demould quickly and well, without waiting for the mortar to dry, the cement / gravel mixture must be as liquid as possible. But the binder is water. And a concrete block made of "dry" and poorly vibrated mortar (if you vibrate too much, you tamp + and you use + mortar >>> not profitable!) Will be stuffed with air pockets. The quality of a concrete block therefore depends on the quality of the ingredients and the quality of manufacture, mixing, "pouring", vibrating, drying. And then a poorly vibrated concrete block will be rougher, it will allow easier adhesion of the plaster but also a greater consumption of plaster ...
By cons from there to split .... without the action of the gel, without it being cantilevered ... ????? de la M .... this breeze block there.
Christophe wrote:As for the "foaming" it is done with an aluminum oxide I believe ... Besides, some "anti" monomur denounce that the aluminum ends up "evaporating" and polluting the inhabitants of the house ... Moué pkoi not .....
Ah well, the aluminum evaporates ... ??? it does not smoke anyway?
Where did you read Christophe? I planned to put it in an interior partition, between bedroom and attic. Suddenly, you put me in doubt!