Ok, this makes sense .... a few too many numbers for my comfort, perhaps -g- ... i just think of it in terms of comparison with water, which is of course the standard specific gravity figure as well, a/k/a the number of tonnes per cubic metre, or the number of kilos per litre .... water being by definition 1.0 tonne per cubic metre, and 1.0 kilo per litre
'Rock volume will expand 50% to include voids, when broken.'
I believe that, and suspect it might be more at times, near double even ...... one of my experiences with shot rock was spreading it while building logging road, and trying to make each load of it go as far as possible, while still making a road that would hold up a loaded truck .... on rare places where the subgrade was firm, you could run the D8 back and forth after spreading shot rock, and reduce its volume by near half, i swear ..... of course where the subgrade was not firm, you needed more because the first lift of it sunk out of sight
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