This test method covers determination of the flexural strength of concrete by the use of a simple beam with third-point loading. The values stated in SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard. Note—For methods of molding concrete specimens, see AASHTO R 39M/R 39 and R 100M/R 100.