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The work aims to investigate the structural performance of Reinforced Concrete (RC) beams strengthened with an innovative system made of stainless steel fibre strips embedded into an inorganic matrix (S-FRCM: Steel –Fibre Reinforced Cementitious Matrix). To simulate existing RC structures and investigate the potential application of S-FRCM system on a poor concrete substrate, the beams were built with low concrete strength. Two different strengthening procedures were used: traditional Externally Bonded (EB) technique and innovative Inhibiting-Repairing Strengthening (IRS) technique. The IRS solution consists in the installation of stainless steel strips in the cover concrete, restoring the latter with a polymer-based inorganic matrix that contains property of protection against further corrosion. This inorganic matrix, as well as similar matrices available on the market labeled as “geopolymeric matrices”, contains fly-ash and/or slags and it is suitable for retrofitting of RC structures with deteriorated cover concrete and/or corroded steel bars. A set of RC beams strengthened according to the two different techniques (EB and IRS) were monotonically tested under four-points bending. Test results show that the S-FRCM system provides an average increment on load carrying capacity of about 25% compared with unstrengthened beam. On the basis of experimental data available in literature, a simple analytical formula for prediction of S-FRCM debonding strain is proposed.

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