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The effects of shear reinforcement quantity on the shear capacity of Polypropylene Engineered Cementitious Composites (PP-ECC) beams were investigated in this study. A RC control beam was prepared with a shear reinforcement ratio of 0.42%. Five additional PP-ECC beams were fabricated with shear reinforcement ratios ranging from zero to 0.42%. One additional RC beam without shear reinforcement was also prepared for comparison. The experimental results showed that the shear carried by the PP-ECC decreased as the shear reinforcement ratio was increased. This was caused by the sliding on the critical crack surface that damaged the PP fibers bridging on the crack. If the reduction of shear carried by the fibers due to the increase in shear reinforcement was not considered, there could be overestimation of shear strength for PP-ECC structural members.

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