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This study aims to explore the main structural implications on the use of CFRP composites for the shear strengthening of R/C beams. Thirty beams 300 cm long with a 15 x 30 cm cross-section were fabricated and strengthened in shear using different strengthening schemes, applying two CFRP composite systems. Failure loads and modes are analysed. The strengthening schemes are also analysed in order to provide valuable information regarding the rational usage of such peculiar material. Experimental results corroborate how versatile the CFRP composites can be, especially when tailored for a particular situation.