SIFCON strengthening of concrete cylinders in comparison with conventional GFRP confinement method

Construction and Building Materials, Volume 36, November 2012, Pages 765-778
B. Abdollahi, M. Bakhshi, Z. Mirzaee, M. Shekarchi, M. Motavalli

College of Civil Engineering, University of Tehran, Tehran, Iran

School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, AZ, USA

Department of Structural, Environmental and Geomatic Engineering (D-BAUG), ETH Zurich, Switzerland

Empa, Swiss Federal Laboratories for Materials Testing and Research, Structural Engineering Research Laboratory, Dubendorf, Switzerland


This paper presents SIFCONstrengthening as a new method of confinement incomparison with GFRPconfinement. The experimental part of the work is focused on the investigation of confinement in concrete specimens with unconfined strength ranging from 15 to 40 MPa, enclosed with GFRP sheets or SIFCON jacket. Several parameters such as number of layers and ply configuration for GFRPmethod and jacket strength, fiber length and jacket thickness for SIFCONmethod have been investigated. Furthermore, the ultimate strength models of FRP-confined concrete have been classified and evaluated with test results and the first step in modeling the ultimate strength of SIFCON-confined concrete has been taken. The results show that SIFCONconfinementmethod can be regarded as a competitive method with respect to the well-known FRP confinementmethod and some of the available models of FRP confinement can also give good estimation of the ultimate strength of concrete confined by SIFCONmethod.

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