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Experimental Investigation of the Influence of Moisture on the Bond Behavior of FRP to Concrete Interfaces

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Title: Experimental Investigation of the Influence of Moisture on the Bond Behavior of FRP to Concrete Interfaces
Authors: Dai, Jian-Guo Browse this author
Yokota, Hiroshi Browse this author →KAKEN DB
Iwanami, Mitsuyasu Browse this author
Kato, Ema Browse this author
Keywords: FRP
Long-term bond durability
Wet/dry cycling
Issue Date: Nov-2010
Publisher: American Society of Civil Engineers
Journal Title: Journal of Composites for Construction
Volume: 14
Issue: 6
Start Page: 834
End Page: 844
Publisher DOI: 10.1061/(ASCE)CC.1943-5614.0000142
Abstract: The effects of moisture on the initial and long-term bonding behavior of fibre reinforced polymer (FRP) sheets-to-concrete interfaces have been investigated by means of a two-year experimental exposure program. The research is focused on the effects of 1) moisture at the time of FRP installation, in this paper termed "construction moisture," consisting of concrete substratum surface moisture and external air moisture, and 2) moisture, in this paper termed "service moisture," which normally varies throughout the service life of concrete. Concrete beams with FRP bonded to their soffits were prepared. Before bonding, concrete substrates were pre-conditioned with different moisture contents and treated with different primers. The FRP bonded concrete beams were then cured under different humidity conditions, before being subjected to combined wet/dry and thermal cycling regimes to accelerate the exposure effects. Adhesives with different elastic modulus were used to investigate the long-term durability of each adhesive, when subjected to accelerated wet/dry cycling. Pull-off tests and bending tests were conducted at the beginning of the cycling and then again, after 8 months, 14 months and 2 years of exposure so as to evaluate the tensile and shear performance of the FRP-to-concrete interfaces. It was found that the effect of the concrete substrate moisture content on short-term interfacial bond performance could be eliminated if an appropriate primer was used. All FRP-to-concrete bonded joints failed at the interface between the primer and concrete after exposure while those not exposed usually failed within the concrete substrate. After exposure to an environment of accelerated wet/dry cycles, it was also found that the interfacial tensile bond strength degraded asymptotically with the exposure time while the flexural capacity of the FRP sheet bonded plain concrete beams even increased. The mechanism behind the above, which is an apparently contradictory phenomenon, is discussed.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 横田 弘

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