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Fiber Spray up Retrofitting

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Reference :
T. Furuta, T. Kanakubo, T. Nemoto, K. Takahashi, K. Itoh, H, Minamihara :
Sprayed Up FRP Strengthening for Reinforced Concrete Beams, International Conference on Composites in Infrastructure, CD-ROM No.094, 2002.6 T. Furuta, T. Kanakubo, T. Nemoto, K. Takahashi, H. Fukuyama :
Sprayed Up FRP Strengthening for Concrete Structures, Proceedings of International Conference on FRP Composites in Civil Engineering, Vol. 2, pp. 1109-1116, 2001.12
Strengthening method using fiber sheet has been popular for reinforced concrete members. However, materials using continuous fibers are expensive. On the spread of seismic strengthening for buildings and infrastructures in future, simple methods of strengthening with low cost should not only be suggested, but also seismic behaviors should be cleared.
(Photo : specimen before strengthening)
Spray up strengthening
A new, inexpensive, and simple strengthening method for concrete structures is introduced in order to improve future seismic strengthening. This method using short fibers with vinyl ester is a new combination of materials as seismic strengthening. Chopped short fibers of carbon and glass with vinyl ester resin are sprayed in place on the concrete structures. It is called "Spray-Up FRP."
Testing Method
Column specimens are subjected to anti-symmetrical bending moment in a cyclic manner by loading frame.
(Photo : specimen after strengthening)

Photos