Im getting ready to pour a new slab 21' wide by 20' long, and am going to build a awning over part of it 15' long by 19' wide. It will be supported with 6x6 posts. My question is I live in Kansas and have to get the footings below the frost line, Im sure I need to isolate the piers from the slab with some expansion joint due to frost heave on the slab and the piers not moving at the same rate which would cause cracks. How should a person do this though? Im pouring a colored concrete patio so I cant pour the piers to slab level then put expansion around them before pouring the slab because then it wont match the slab color (Ill be hand mixing piers and cant color the same as concrete company will be doing). Confused on how to isolate piers and slab but have concrete match in both?