The ACI Building Code requires the control of flexural cracking in reinforced concrete structures. Because of durability concerns, the use of thicker concrete covers is rapidly increasing. However, currently used crack control methods that are based strictly on statistical reasoning become unworkable with the use of thick covers. This study investigates the development of the crack control provisions and the crack width equation on which those provisions are based explores the use of the crack width equation for the calculation of large covers, and presents a new formulation of the equation for calculating crack width that is based on the physical phenomenon. Use of that equation is supported by an evaluation of existing test data; based on that equation, a design recommendation is presented for the control of cracking that addresses the use of both coated and uncoated reinforcement.
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