ASTM C1609/C1609M − 12 Standard Test Method for Flexural Performance of Fiber-Reinforced Concrete Using Beam With Third-Point Loading

ASTM C1609/C1609M − 12 Standard Test Method for Flexural Performance of Fiber-Reinforced Concrete Using Beam With Third-Point Loading

Scope

1.1 This test method evaluates the flexural performance of fiber-reinforced concrete using parameters derived

from the load-deflection curve obtained by testing a simply supported beam under third-point loading using a

closed-loop, servocontrolled testing system.

1.2 This test method provides for the determination of first-peak and peak loads and the corresponding stresses

calculated by inserting them in the formula for modulus of rupture given in Eq 1. It also requires determination

of residual loads at specified deflections, the corresponding residual strengths calculated by inserting them in

the formula for modulus of rupture given in Eq 1 (see Note 1). It provides for determination of specimen

toughness based on the area under the load-deflection curve up to a prescribed deflection (see Note 2) and the

corresponding equivalent flexural strength ratio.

ASTM C1609/C1609M − 12 Standard Test Method for Flexural Performance of Fiber-Reinforced Concrete Using Beam With Third-Point Loading

Significance and Use

5.1 The first-peak strength characterizes the flexural behavior of the fiber-reinforced concrete up to the onset of

cracking, while residual strengths at specified deflections characterize the residual capacity after cracking.

Specimen toughness is a measure of the energy absorption capacity of the test specimen.

The appropriateness of each parameter depends on the nature of the proposed application and the level of

acceptable cracking and deflection serviceability.