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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Manufacturing, Durability and BondBehavior of FRP Bars with Nanoclay
Author(s): P.V. Vijay, H.V.S. GangaRao, and V. Krishnaswamy
Publication: Special Publication
Appears on pages(s): 77-98
Keywords: bond; durability; FRP; moisture; nanoclay; pullout;pultrusion; shear; tension
Abstract:This paper focuses on the behavior of Glass Fiber Reinforced Polymer (GFRP)bars manufactured with nanoclay. Benefits of nanoclay in the resin for manufacturingFRP composites include reduced moisture ingress, better fire resistance, and enhancedresin stiffness. Several molds were developed at CFC-WVU laboratory to produce glassFRP bars with smooth surface, and crescent shaped or circular lugs. Bars weremanufactured at room temperature by manual pultrusion process with varying fibervolume content and percentage of nanoclay. Vinyl ester resin exfoliated with nanoclaywas used to manufacture GFRP bars with a fiber volume fraction of 44.7% and tested fortensile, bond and shear strength.Bars manufactured in this research and tested in tension had typical ultimate stress of108.76 ksi (749.87 MPa) –133.43 ksi (919.96 MPa) and stiffness of 4.18 msi (28.8 GPa) -4.67 msi (32.2 GPa). Pullout tests conducted on a bar with crescent-shaped lugs andcircular lugs embedded in concrete provided a maximum bond stress value of 2385 psi(16.44 MPa) and 1762.77 psi (12.15 MPa), respectively. Bars with nanoclay showed8.3% less shear strength than those without nanoclay (24.10 ksi (166.16 MPa) vs. 26.27ksi (181.13 MPa)). Bars with nanoclay absorbed more moisture initially than barswithout nanoclay, and the moisture absorption decreased with time.
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