FRP bar properties - Reinforced Concrete with FRP Bars: Mechanics and Design - page 44

(a) (b) (c)

Crack Initiators

(d) (e)

Dogbone Dogbone

(f ) (g)

Figure 3.6 Types of test methods for different bond values of FRP reinforcement in con-
crete: (a) pullout specimen; (b) beam-end specimen; (c) simple beam speci-
men; (d) hinged beam-end specimen; (e) splice specimen; (f) cantilever beam
specimen (without dogbones); and (g) cantilever beam specimen (with dog-
bones) (ACI 440-3R).

aged in an alkaline solution 1 (with a pH included between 12.6 and 13) at
140°F (60°C) for exposure times of 1, 2, 3, 4, and 6 months. A second set
of bar specimens is subjected to a constant tensile load for exposure times
of 1, 2, 3, 4, and 6 months while immersed in the alkaline solution inside an
environmental cabinet and having a constant temperature of 140°F (60°C).
A third set of bar specimens embedded in concrete is subjected to the same
conditioning as the second set. The magnitude of the sustained load is
meant to be representative of the service conditions or such to induce a ten-
sile strain of at least 2000 microstrain. At the end of the three series of tests,

1 The suggested composition of the alkaline solution consists of 118.5 g of Ca(OH) 2 , 0.9 g of
NaOH, and 4.2 g of KOH in 1 L of deionized water.