ASTM D7913/D7913M-14 (R2020) PDF Download

ASTM D7913/D7913M-14 (R2020) is a standard test method that specifies the procedure for determining the bond strength between fiber-reinforced polymer (FRP) composite bars and concrete using pullout testing. The bond strength between FRP reinforcing bars and concrete is an important performance aspect in material specifications and design standards. This test method provides a standardized procedure for preparing specimens and conducting pullout tests, and it also defines a standard method for calculating, evaluating, and reporting bond strength.

The test method is intended for use in laboratory tests, where the size or type of FRP bars is the principal variable. However, it should not be used to establish design bond values and development lengths for FRP bars embedded in concrete, as it does not represent the actual bond stress observed in concrete flexural members reinforced with FRP bars. For determining bond stress in steel bars, ASTM Test Method A944 should be used.

The primary purpose of this test method is to determine the bond behavior for material specifications, research, and development. The bond behavior may vary depending on the specimen configuration, which can influence both analysis and design. The main test result provided is the bond strength between the specimen and normal weight concrete.

In addition to its use in material specifications and research, this test method can also be used to determine the conformance of a product or treatment to a requirement related to its effect on the bond between FRP bars and concrete. However, the results obtained should only be used for comparative purposes to compare parameters or variables of bond strength. The method may also be employed to investigate the long-term environmental effects on the bond between FRP bars and concrete, including determining environmental reduction factors for FRP bars embedded in concrete.