common problems with cacl testing

[CC Solutions]

40% if the slab is drying in one direction only. 20% if it can dry from two directions.

I just had a client call and ask how in the world can they probe a 12" thick slab? I asked if it was cast-in-place and they confirmed it was, so they only needed to go 2.4" into the concrete, or 20%.

I know you guys know this, but sometimes these threads get Googled up, and someone may mistake 40% as a constant.