ASTM D7205/D7205M-21 PDF Download

ASTM D7205/D7205M-21 is a standard test method that determines the tensile properties of fiber reinforced polymer matrix composite bars. These bars are commonly used as tension elements in reinforced, prestressed, or post-tensioned concrete structures. The test method focuses on obtaining longitudinal tensile strength and elongation data.

The test factors that are considered in this standard include specimen preparation, specimen conditioning, environment of testing, specimen alignment and gripping, and speed of testing. These factors ensure accurate and reliable results. The properties that can be obtained from this test method include maximum tensile force, ultimate tensile strength, ultimate tensile strain, tensile chord modulus of elasticity, and stress-strain curve.

This test method is applicable to linear elements used for reinforcing Portland cement concrete, which can be referred to as bars, rebar, rods, or tendons. The method provides specific details for preparing and testing bars and grids, and also suggests the use of grouted anchors to prevent grip-induced damage to the ends of the bar or grid.

It is important to note that the strength values obtained by this method are short-term static strengths and do not account for sustained static or fatigue loading. Additional material characterization may be required, especially for bars that will be subjected to high levels of sustained or repeated loading. The standard also includes provisions for reporting results in both inch-pound units and SI units.