Sorry in advance if this isn't the appropriate activity area for this thread. I'm doing some utility removal beneath a concrete slab on grade. It's a small area 5'x5'x~4'D. I want to backfill in 8" lifts and achieve a 95% MDD compaction. The replacement pad will be ~5" thick with #4 bar 12" oc each direction placed mid-depth. The pad will be dowelled into the existing with two #4 bar on each side embedded 8" with epoxy. The area gets some vehicular traffic. What kinds of manual field tests are done to see if the soil is compacted enough? I have used a boot technique. I kick or grind my boot on the sub grade and if I can make an impression with moderate effort it needs to be compacted more. I've only done this as a pretest to the actual ASTM testing and so far have had good results. This time there will be no ASTM testing. Please don't ask why; right, wrong or different, that's just the way it's going to be. Looking for feedback if anyone else does something similar or different also with good results.
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