I have a 32ft x 42ft pile cap foundation with a 6" x 6" wide curb all around. The pile cap will be poured first with dowels projecting. The curb will be poured next. It has one #4 bar in the long direction. My question is this: Should I cut control joints in the curb at say 10' intervals or will the curb not crack since it is dowelled into the cap and reinforced. I'm using f'c=4000 conc with w/c ratio=.45 and 6% air entrainment. If I need control joints how long after the pour can/should they be cut?
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