Around here, material that is rejected is made into bunker blocks, who knows what else.
Clean outs, really hard to see a use for it, with all the excess water, aggregate settled out etc. You already got a bunch of good information below. Honestly, as far as compressive strength, what one thinks and what is proven out with what you are contemplating is never going to match. You would need to design a 3500 PSI mix intentionally and prove it through cylinder breaks. You might get lucky, never know, but then again with all the variables, not worth fooling for the most part.
So, one time, many years ago, I used a specified mix design for a lightweight concrete fill, in an elevator machine room roof deck. It was 1000 PSI, most worthless concrete I ever worked with, and did not hold up at all when used in other places. Why this design mix ever came to be is beyond me. Who knows, might also have been defective. It was a total waste of labor.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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