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12 concrete blocks, on which hybrid fibrous sheets (carbon fiber and glass fiber) had been bonded, were subjected to tensile load in order to estimate properties of the bonded interface. the sheet length was varied by 100 mm, 200 mm and 400 mm. It was found that more than 150 mm bond length is required to achieve the maximum bearing capacity of the interface. In this study, maximum bond stress τ F,max , ultimate slip S FU of the interface were estimated τ F,max = 3.0 MPa and S FU = 0.175 mm, respectively.