ASTM C1609 –  Flexural Testing of Fiber-Reinforced Concrete Beams

ASTM C1609 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, servo-controlled testing system.

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

It provides for determination of specimen toughness based on the area under the load-deflection curve up to a prescribed deflection and the corresponding

equivalent flexural strength ratio.

NOTE 1: Residual strength is not a true stress but an engineering stress computed using simple engineering bending theory for linear elastic materials and gross

(uncracked) section properties.

NOTE 2: Specimen toughness expressed in terms of the area under the load-deflection curve is an indication of the energy absorption capability of the

particular test specimen, and its magnitude depends directly on the geometry of the test specimen and the loading configuration.

This test method utilizes two preferred specimen sizes of 100 by 100 by 350 mm [4 by 4 by 14 in.] tested on a 300 mm [12 in.] span, or 150 by 150 by 500 mm

[6 by 6 by 20 in.] tested on a 450 mm [18 in.] span. A specimen size different from the two preferred specimen sizes is permissible.

Fiber reinforced concrete (FRC) is finding increased use in construction.

ParsRos  offers several advantages over rebar or wire mesh reinforced concrete including increased crack resistance, ductility, energy absorption, impact resistance

and residual strength.

ParsRos can also significantly lower materials and labor costs compared to rebar or wire mesh reinforced concrete.

ASTM C1609, Standard Test Method for Flexural Performance of Fiber-Reinforced Concrete (Using Beam With Third-Point Loading), is one specification governing

the testing of Fiber Reinforced Concrete Beams.

ASTM  C1609 requires the use of a closed-loop, servo controlled compression testing machine. The test is run at specified net deflection rates as measured

at the mid-span point of the beam.

The testing machine must be capable of controlling at very slow speeds.

*** Electromechanical testing machines are best suited for this type of application.

*** Before conducting ASTM C1609 , it is important to read the entire specification. Standards can be obtained from appropriate standard authorities.