SHEAR AND FLEXURAL TOUGHNESS OF TAILINGS SAND CEMENT-BASED COMPOSITES REINFORCED BY PVA

Through the double-sided shear test and four-point bending test of PVA reinforced cement-based composite, the double-characteristic indexes of toughness ratio and toughness index were used to evaluate the shear toughness and bending toughness, and the effects of different fiber content and water binder ratio on the shear toughness and bending toughness were observed. The test results showed that the ductility and energy absorption capacity of PVA reinforced tailing sand cement-based composite were significantly improved compared with those without fiber, and the shear toughness and bending toughness of the composite with fiber were better, the effect of the toughening degree of the sample was significant, and the toughness quality was greatly increased. In this test, when the water binder ratio was 0.25 to 0.3 to 0.35, the toughness ratio and toughness index increased correspondingly. When the water binder ratio was 0.35, the toughness ratio and toughness index increased obviously.