re: Ot engineers/construction guys

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how does corrosion control come into play with clearance? or does it at all?

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For us it's usually corroded because of winter salting the roads. You assume the bottom cover doesn't do much in terms of strength (and is usually the first to crack- its normal, mostly), but it does help protect steel from corrosion. Using an epoxy coated bar can help, but you pay for it in development lengths most often, and its ability to adhere to the concrete around it is less than if you didn't use it.