Control Joints in Slab for Water Tank
Control Joints in Slab for Water Tank
(OP)
I have a 12" thick slab with #5 @12" o.c top and bottom. I want the steel to be continuous through the control joints (and construction joints). I read somewhere that the control joint should be cut to a depth of 1/3 the slab thickness. If I have top steel with 2" of cover, they will not be able to cut the joint any deeper than 2".
The slab is for a water tank that will probably be leak tested. There will be no membrane on the tank floor during this test.
Does anyone have any suggestions? The tank is 70'x70'
The slab is for a water tank that will probably be leak tested. There will be no membrane on the tank floor during this test.
Does anyone have any suggestions? The tank is 70'x70'






RE: Control Joints in Slab for Water Tank
Another option would be to use a little more rebar to create "continuous reinforcement" (rebar = 0.5% to 0.7% of the concrete cross-sectional area).
Whichever way you go the most important action is to immediately and continuously wet cure the concrete (at least 7 days) to minimize shrinkage and improve watertightness.
RE: Control Joints in Slab for Water Tank
What do you mean by the term "continuous reinforcement". Is this a technical term. Do you have a reference for the 0.7% reinforcing ratio or are you just basing this on the chart in ACI350R
RE: Control Joints in Slab for Water Tank
For a two-dimensional slab, like yours - this general concept (large, heavily reinforced concrete slabs with minimal joints) is used for the (watertight) basins of electric power generating station cooling towers.
My reference for the pavement is (and was 18 years ago):
Page 16-59
"Standard Handbook for Civil Engineers, Third Edition"
Frederick S. Merritt, Editor
McGraw-Hill, Publisher
Best Wishes
RE: Control Joints in Slab for Water Tank