Investigation of bond strength and flexural behaviour of FRP-strengthened reinforced concrete beams using cement-based adhesives

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Title: Investigation of bond strength and flexural behaviour of FRP-strengthened reinforced concrete beams using cement-based adhesives
Author(s): Hashemi, S.; Al-Mahaidi, R.
Abstract: Retrofitting of structures has become a major issue worldwide due to increases in the applied loads, human error in initial construction, legal requirement to comply with updated versions of existing codes, or the loss of strength due to deterioration over time. In this regard, fibre-reinforced polymer (FRP) retrofitting systems are enjoying a great deal of popularity as a result of the unique properties of FRPs. Retrofitting with epoxy-bonded FRP composites is suitable for environments where the temperature is well below the glass transition temperature (T g) of the epoxy adhesive. [T.sub.g] is normally in the range of 55-60 [degrees]C (fib, 2001; Saafi, 2002). It would be very beneficial if it is replaced with cementitious (mineral) based bonding agents in order to produce fire-resistant strengthening systems. Pilot testing conducted by the authors has shown that excellent bonding properties can be achieved using the cement-based adhesives (Hashemi & Al-Mahaidi, 2009). Test results were applied for the next stage of the project presented in the current paper. Tests include the investigation of bond strength of FRP fabrics to the concrete substrate by single-lap shear test and flexural behaviour of FRP-strengthened reinforced concrete beams using cement-based adhesives. The bond-slip response has been developed for the strengthening system. It is concluded that using cement-based bonding materials is a promising technique in FRP applications for structures located in hot regions or in danger of fire.
Publication type: Journal article
Research centre: Swinburne University of Technology., Faculty of Engineering and Industrial Sciences
Source: Australian Journal of Structural Engineering, Vol. 11, no. 2 (May 2010), pp. 129-139
Publication year: 2010
FOR Code(s): 0905 Civil Engineering
Keyword(s): Bonding properties; Cement-based adhesives; Fire resistance; Fibre-reinforced polymers; FRP; Rehabilitation
Publisher: Institution of Engineers
ISSN: 1328-7982
Publisher URL: http://www.engineersmedia.com.au/journals/ajse.html
Peer reviewed