ASTM C1399
Full Name
ASTM C1399 – Standard Test Method for Obtaining Average Residual-Strength of Fiber-Reinforced Concrete
Scope
ASTM C1399 outlines a test method for determining the average residual strength of fiber-reinforced concrete (FRC) test beams. It focuses on the post-cracking behavior of FRC, providing a quantitative measure of its strength after initial cracking.
The scope of ASTM C1399 includes:
- Test specimen: the test is performed on a fiber-reinforced concrete beam of specified dimensions (typically 4″x4″x18″ or 6″x6″x20″).
- Initial cracking: the beam is initially loaded with a steel plate underneath to control cracking and prevent sudden failure. The load is applied until a specified deflection is reached, typically between 0.25 mm and 0.5 mm.
- Reloading: after the initial crack, the steel plate is removed, and the beam is reloaded. The load-deflection curve is recorded during this reloading phase.
- Calculating average residual strength: the average residual strength is calculated by averaging the load values at specified deflections on the reloading curve. These specified deflections are typically multiples of the initial crack deflection.
- Applications: the test method is used to evaluate the performance of fiber-reinforced concrete, allowing for comparison between different fiber types, contents, and dimensions. It helps assess the post-cracking strength and toughness of FRC, which are important properties for applications like industrial floors, pavements, and shotcrete.
ASTM C1399 provides a standardized method for assessing the residual strength of fiber-reinforced concrete, offering valuable insights into its post-cracking behavior and enabling informed decision-making in the selection and design of FRC for various applications.
ASTM C1399 Accredited Laboratory
Applied Testing & Geosciences, LLC is accredited for performing tests using the ASTM C1399 standard.
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Resources
Keywords
fiber-reinforced concrete; residual strength; test beam; deflection; load; cracking; average residual strength; post-cracking strength; toughness