> I believe it's entirely possible. When you are a novice learning arc welding
> & gas cutting the first lesson is to place the metal properly. If you weld
> or burn on concrete you can super heat the trapped water inside. It will
> definitely explode. I have seen it happen. Lightning super heating moisture
> as it
> passes along a wire/pipe in concrete can cause this.
I don't think so.. Yes, it explodes or spalls, but the explanation is
wrong. It's the thermal stresses (like pouring water on non-pyrex type
hot glass). And, as Hank Lonberg pointed out, in well constructed
concrete, there aren't any gaps for liquid water to accumulate in.
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