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Joints in structural floor slab

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I am designing structural slab 80 ft. x 180 ft.  It is a suspended slab on drilled piers.  Supports are typically about 15 ft. on center.  I am investigating the need for jointing.  I have a 6 inch slab with #4 top and bottom reinforcing each way.  Since this is a structural slab I don’t see a need for shrinkage joints.  I was wondering what precautions should be taken to minimize shrinkage cracking of the concrete.  Also, would the 180 ft. span be too long for a single pour?  Would a construction joint be recommended?

 

Thanks for any insight

 

Rich