Cryogenic

[Coffeeman2014]

Hi everyone :
Hope you all are doing great !
I have a cement block that I have drill it in the center and I want to make cracks in this block by using a cryogenic fluid (LN2 or liquid CO2) .. anyway, my question is (( What's the differences between cooling a block from the center to outer boundary and vise versa ?))

Thanks and I really appreciate your time

NBQ

 

[Compositepro]

I do not think a cold fluid will work for what you want to do. The high heat from an oxygen lance will drill through concrete.

 

[Coffeeman2014]

Hi Compositepro
Thanks for your reply. I don't want to drill through the concrete by using the cold fluid (I already have the block drilled) , I just want to do a crack in the surface of the concrete. But I am planning to set some lab work for this. However, I am asking if the temperature gradient will be different if am going to apply the cold fluid in the center of the block (inside the well) that if I apply the cold fluid in the outer surface of the block (I will immerse it in a cold fluid container) ?

 

[chicopee]

I would heat the periphery of the hole, real hot that is but not to the point of spalling the concrete surface, then apply the cold fluid in the well, that should crack it. You may have to experiment on few blocks first.

 

[Coffeeman2014]

Thanks chicopee .. I am planning to do couple of lab test and see