Concrete Q & A: Ice Rink Slab Cracking


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Title: Concrete Q & A: Ice Rink Slab Cracking


Publication: Concrete International

Volume: 36

Issue: 5

Appears on pages(s): 75-76


Date: 5/1/2014

We have a contract to build an ice skating rink. The rink slab will be 80 by 180 ft (24 by 55 m) and 5 in. (125 mm) thick. The project specification requires 4000 psi (28 MPa) concrete, and the drawings show No. 4 bars at 12 in. (300 mm) on center each direction for bottom reinforcing and “6x6x10 WWM” for top reinforcing. Coolant pipes (1 in. [25 mm] HDPE) are shown at slab mid-depth. No sawed joints are shown in the slab, but there is an expansion joint around the perimeter. With such a large slab and no contraction joints, won’t cracking be likely? What should we tell the Owner to expect? How can we minimize cracking?