聚乙烯醇纤维增强尾矿砂水泥基复合材料的剪切和弯曲韧性

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

通过对聚乙烯醇纤维(PVA)增强水泥基复合材料试件进行双面剪切试验和四点弯曲试验,运用韧性比和韧性指数双特征指标来评价剪切韧性和弯曲韧性,同时观察不同纤维掺量和不同水胶比对剪切韧性和弯曲韧性的影响。试验结果表明:与未掺入纤维的试件相比,PVA增强尾矿砂水泥基复合材料试件的延性和吸收能量的能力有明显提高,掺有纤维的试件其剪切韧性和弯曲韧性较好,试件的韧化程度效果显著,韧性质量大幅增加。试验中水胶比由0.25到0.3再到0.35时,韧性比和韧性指数也相应增加,当水胶比为0.35时,韧性比和韧性指数有较明显提高。

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.