Do yourself a little experiment, go to your local auto-parts store and get some JBweld, heat it to the boiling point then flash cool it with icewater and it will cure in seconds.
With the right formula and cooling... you never know, its worth considering at least.
I have thought about the pressure as well...
the mix has steel fiber mixed into to it so its going to want to stick together. At first there will be a lot of gas escaping through it. Venting veins will spider through the mix and hopefully the gas flow will carry the mud further down the vein...
I worked as a labor at a coal power-plant in Gillette WY, this it what they used to secure the turbine, main pumps and burner. I don't know what they used on these walls but I wouldn't be surprised if was this stuff.
I understand its hot, but this isn't about cooling it. I am trying to seal...
Theirs no harm in tossing the old peanut around, you never know where the sulution can come from.
Could explain why you don't believe this would work?
I don't know how the grout would handle it, but when JBweld is burned it makes a hard porous crust that does not have as much strength as...
I had a lot more detail typed up but windows decided to eat it
So here is my idea:
(link to some epoxy resin deleted)
crazy strong stuff, think of JBweld concentrate mixed with silica.
Throw some steel fiber in the mix for good measure.
Now if this stuff gets to hot it will...