Even though these are generally 75 thick also I like to put control joints in at max. This pipe if it not otherwise covered by driveways and footpaths has to have a 300 wide concrete cover. This enables us to pump in anti termite chemicals at set intervals. We have a requirement in the BCA here in the tropics that we have to place a termite reticulation pipe around the whole of a new house's perimeter.Small 75 thick footpaths I like to see joints at 2000 max. For slabs wider than footpaths the longest side of any section should be no longer than 1.5 times the width of the shorter side.With thicker slabs being allowed longer spacings. For example "the joint spacing to be no more that 30 times the thickness of the slab" That would make a 100 slab to have joint every 3000. I have seen other criteria for spacing the joints, based on the thickness of the slab.A general rule of thumb is to place a control joint in a slab at least every 3000.This allows the rebar to be cut and and so let the slab expand and contract, and yet it stops any vertical movement between the two. Concrete control joints - A modern metal key joint.
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