Technical Questions

What are the test methods used for evaluating fiber-reinforced concrete?

Q. What are the test methods used for evaluating fiber-reinforced concrete?

A. Various test methods are used to evaluate the properties and performance of fiber-reinforced concrete (FRC), capturing the unique characteristics imparted by the fibers in both fresh and hardened states. Common test methods include:

1. Uniaxial Tensile Test: Measures the tensile properties of FRC directly but can be challenging due to issues like slippage or concrete crushing at the grips.
2. Wedge Splitting Test: An indirect method for evaluating the uniaxial tensile properties of FRC.
3. Beam Tests: Common flexural tests performed under three- or four-point configurations to assess the flexural performance and post-crack behavior of FRC.
4. Round Panel Tests: Used to evaluate the flexural toughness of FRC through a centrally loaded round panel, providing insights into energy absorption and post-crack performance.

The selection of a test method depends on the specific properties of interest and the intended application of the FRC. These standardized test methods ensure consistent and comparable results across different projects and applications.

References: ACI 544.1R, ACI 544.9R

Topics in Concrete: Concrete Fundamentals, Fiber Reinforced Concrete, Testing of Concrete