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RC beams retrofitted with cardifrc - behaviour after thermal cycling

Author(s): F.A. Farhat, B. Karihaloo
Paper category: Workshop
Book title: Fifth International RILEM Workshop on High Performance Fiber Reinforced Cement Composites (HPFRCC5)
Editor(s): H.W. Reinhardt, A.E. Naaman
ISBN: 978-2-35158-046-2
Pages: 409 - 417
Total Pages: 9
Language: English

A new retrofitting technique using CARDIFRC, a material compatible with concrete, has recently been developed at Cardiff University. It overcomes some of the problems associated with the current techniques based on externally bonded steel plates and FRP which are due to the mismatch of their tensile strength, stiffness and coefficient of linear thermal expansion with that of concrete structure being retrofitted. It has now been tested under thermal cycling. Each thermal cycle tried to mimic a 24-hour temperature variation in hot dry climate when exposed concrete surfaces are known to reach very high temperatures. It consisted of a temperature rise period from room temperature to 90°C, followed by a dwell period of 8 hours at this elevated temperature and a slow cooling period back to room temperature. The test and analytical results show that thermal exposure does not cause any degradation to the retrofitted beam strength, or to the bond between concrete and CARDIFRC. It is therefore a very promising material for repair and retrofit in high temperature environments

Online publication: 2014
Publication Type: full_text
Public price (Euros): 0.00

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