Hi pelelo, if I may add my two cents:
In my experience, compaction grouting is usually terminated ~10 feet below the surface because there is not enough overburden to allow the grout to compact the soil. Yes, you can get heaving, but the in situ soil is still below your target compaction...
I'd be curious to know where you are setting-up shop...My experience has been that the various brands provide good quality at similar prices. Some items are even made by the same manufacturer and rebranded. As for value, you can skip the automated machines (pneumatic proctors, for instance) and...
I know I'm late on this, but want to reply for anyone else that stumbles across this post...
Nuke gauges have problems when the water content approaches/exceeds ~35 pcf of water, regardless of the percent moisture content. The wet density tends to be accurate, as such I'd take a nuke test and a...