【摘要】 采用Φ120mm分离式霍普金森压杆(Split Hopkinson Press Bar,SHPB)试验装置进行巴西圆盘劈裂试验,研究在应变率范围0.96～30.30s-1微胶囊-纤维水泥基复合材料的应变率敏感性和破坏规律。试验结果表明,水泥基复合材料具有明显的应变率效应,其劈裂抗拉强度随着应变率的增加而提高,掺入聚乙烯醇(PVA)-聚乙烯(PE)混杂纤维时水泥基复合材料劈裂抗拉强度最高。在动态荷载作用下,掺入纤维不仅能有效抑制基体微裂纹的萌生和降低扩展速度,而且能改善微胶囊自修复混凝土的抗冲击韧性。更多还原

【Abstract】 A 120 mm Split Hopkinson Press Bar(SHPB)test device was used to carry out the brazilian disc splitting test,and the strain rate sensitivity and failure law of the microcapsule-fiber cement based composites in the strain rate range of 0.96～30.30 s-1 were studied.The test results show that the cement-based composite material has a significant strain rate effect,and its split tensile strength increases with the increase of the strain rate.When mixed with polyvinyl alcohol(PVA)-polyethylene(PE)hybrid fibers,the cement-based composite material have the highest split tensile strength.Under dynamic load,the incorporation of fibers can not only effectively inhibit the initiation of microcracks in the matrix and reduce the growth rate,but also improve the impact toughness of the microcapsule self-healing concrete.更多还原