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An analysis of the data presented in the studies by Hughes, Mindess and Bischoff noted above shows that the impact energies actually employed in their studies of concrete utilized about 1000 joules to fragment a 10 cm block of concrete into 1 cm, or smaller, cubes, in which case the fragmentation process actually used only about 5.4 % of the available energy. This suggests that impact fragmentation is not a very efficient process.
That seems odd...
...but let say you drill a X diameter hole in material Y... z inches deep.. we can compute the volume of the material destroyed by the drilling... even I can do that... We can also meter the electricity used to run the drill.. measure the heat change in the motor itself and in the shavings and the region around the hole. That is an experiment I can conceive of in my mind and maybe could do in a lab environment.
I know the metal shavings are damn hot! I don't see why concrete would be much different... but that would depend on the matrix which holds it together. Fibreglass gets hot too.
One would think that it's possible to come up with a range of heat released with some quickie math (the kind I can't do). It seems that if 100,000 tons of concrete is *dustified* to use their term...mechanically... you would have a hell of a lot of heat produced... No?
Come on scientists... how hot?
SanderO wrote:I don't know that such a calculation will impress anyone... especially if they can't understand it.
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