FRP bar properties - Reinforced Concrete with FRP Bars: Mechanics and Design - page 42

Figure 3.5 Typical transverse shear test setup.
3.2.2 ACI 440 test methods
This section provides an overview of the test methods applicable to FRP
bars for use in nonprestressed concrete that are outlined in ACI 440.3R
“Guide Test Methods for Fiber-Reinforced Polymer (FRP) for Reinforcing
or Strengthening Concrete and Masonry Structures” [59] and summarized
in Table 3.3.
Test method for bond strength of FRP bars by pullout testing (test method
B.3). Various types of test methods are available for the determination of
different bond values of FRP reinforcement in concrete structures, as shown
schematically in Figure 3.6 [61-64]. In this method, the bond strength of
the FRP bar specimen is measured by pullout testing. The direct pullout
test consists of measuring the pullout strength of an FRP bar embedded in
a concrete block through a predetermined bonded length. A bond breaker is
applied along the first five diameters on the pulling side of the bar, to mini-
mize any undesired confinement effect that may affect the bond character-
istics. Schematic and photographic views of a typical test setup and typical
failure mode of a GFRP bar are shown in Figure 3.7(a-d). Typical free and