That’s a bit of a pity, free is always best. When crushing insulating firebrick a similar thing happens. As it’s the air that does the insulating the dust is normally not included in the mix, but you can use it elsewhere as you suggest.
Don’t bother crushing the dense firebrick for addition to mortar as anything larger than 0.5mm is too coarse for mortar. Sand is cheap enough.
Don’t bother crushing the dense firebrick for addition to mortar as anything larger than 0.5mm is too coarse for mortar. Sand is cheap enough.
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