Recent work by Nawy, et al., on the cracking performance of high strength prestressed concrete beams, both pretensioned and post-tensioned has shown that the factor 5.85 in Equation 7.36a is considerably reduced. For concrete strength in the in the range of 9,000 to 14,000 psi (60 to 100 MPa), this reduces to 2.75, so that the expression for the maximum crack width at the reinforcement level (inch) becomes.