Civil Engineering Reference
In-Depth Information
(a)
(b)
Figure 3.13
Views of the (a) test setup and (b) a failed specimen.
materials, limits on constituent volumes, and minimum reinforcements for
CFRP and GFRP bars to be used as nonprestressed concrete are indicated
in ACI 440.6, “Specification for carbon and glass fiber-reinforced polymer
bar materials for concrete reinforcement” [70]. As partially apparent in its
title, this standard covers GFRP and CFRP bars made with thermosetting
resins only (excluding polyesters).
For the determination of each of the mechanical and durability proper-
ties for product certification and quality assurance, ACI 440.6 prescribes
the testing of at least 25 samples obtained in groups of five from five dif-
ferent production lots. The following sections summarize the requirements
of this standard.
3.3.1 Constituent materials
The test method of reference for measuring the constituent in an FRP
bar sample is the ASTM D3171, “Standard test method for constituent
content of composite materials.” With this test method, the fiber volume is
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