Water Retaining Tank Mat
Water Retaining Tank Mat
(OP)
All
We have an aeration basin that is approximately 128 ft by 130 ft in plan with a 61 ft by 40 ft corner cut out. The contractor has submitted an RFI to place this 2 ft thick mat in 1 day. It is approximately 1130 cy of concrete. The mat is reinforced with 2 layers of #6 at 6" o.c. Currently we show construction joints about 30 feet on center. I have seen larger pours than this for a mat but never for a water retaining structure. I am very concerned about the structure cracking (then leaking) due to shrinkage. Has anyone done a mat this size in one day for water retaining structures? Any advice on it?
Thanks,
Mike
We have an aeration basin that is approximately 128 ft by 130 ft in plan with a 61 ft by 40 ft corner cut out. The contractor has submitted an RFI to place this 2 ft thick mat in 1 day. It is approximately 1130 cy of concrete. The mat is reinforced with 2 layers of #6 at 6" o.c. Currently we show construction joints about 30 feet on center. I have seen larger pours than this for a mat but never for a water retaining structure. I am very concerned about the structure cracking (then leaking) due to shrinkage. Has anyone done a mat this size in one day for water retaining structures? Any advice on it?
Thanks,
Mike






RE: Water Retaining Tank Mat
* Thirty feet between joints
* Pour slab in a checkerboard pattern
* Wait 14 days between adjacent pours.
I've done a lot of large basins. If it leaks, the contractor will never admit his changes created the leaks. You'll be answering questions for a long time after the contractor hits the golf course. The owner will hire some technical expert (maybe me) and I'll tell them the large pour caused the problem.