Control joints in 12" SOG 1

[cec17]

I have an equipment slab that is fairly large 130' x 20' and 12" thick for traffic reasons. I would like to break up the "long" direction with control joints. However, usually the depth of our control joint sawcut is D/4 (and I have seen D/3).

That would put the saw cut in a 12" slab at 3" or 4" deep which is deeper than our top mat of steel. What have you done about control joints in a 12" slab? Just reinforce to 0.5% and don't install control joints? 12" seems like the cutoff zone, where detailing at control joints comes into play due to top mat depth.

 

[cec17]

Thanks dik. I can't recall ever specifying epoxy coated bars and don't plan on it here... I have always heard that if they get any damage onsite, from the usual abuse and toss-around, it can increase chance of corrosion. It's not worth the additional cost in this instance given low exposure to chlorides.