5.0 Opening to Traffic
Compressive strength requirements for paving concrete are generally specified at 3,000 psi ( 20.7 MPa) at 28 days. The repair concrete should develop an equal or greater strength by the time it receives traffic loadings. However, to minimize lane closures, traffic loadings may be allowed on a patched area when the repair concrete has attained the minimum strength needed to assure its structural integrity. The compressive strength required for the opening of partial-depth repairs to traffic may be lowered because of their lateral confinement and shallow depth.
The specifications of rapid-setting proprietary mixes should be checked for recommended opening times. Cylinders or beams can be tested for strength to determine what opening time will be allow the repair material to develop enough strength.