Description

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, servo-controlled testing system.

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.

Basic Results

• P1: First-Peak Load, Load value at the first point on the load-deflection curve, where the slope is zero.
• P_p: Peak Load, Maximum load on the load deflection curve.
• δ₁ (d 1): Net deflection at First-Peak Load
• δ_p (d p): Peak-Load deflection, Net deflection value on the load-deflection curve at peak load.
• f 1: First-Peak strength, Stress value, obtained when the first-peak load is inserted in formula for modulus of rupture given by Eq. 1
• f_p: Peak strength, Stress value, obtained when the peak load is inserted in the formula for modulus of rupture given by Eq. 1
• P 600: Residual Load, Load value corresponding to a net deflection of L/600
• P 150: Residual Load, Load value corresponding to a net deflection of L/150
• f 600: Residual strength, Stress value, obtained when the residual load P600 is inserted in the formula for modulus of rupture given by Eq. 1.
• f 150: Residual strength, Stress value, obtained when the residual load P150 is inserted in the formula for modulus of rupture given by Eq. 1.
• T150: Specimen toughness, Toughness of beam specimen of nominal depth D at the net deflection of L/150. (Area under the load vs. netdeflection curve 0 to L/150)
• δ₁ (delta 1): First peak deflection, Net deflection value onthe load-deflection curve at first peak load.