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冲击作用下超高性能水泥基复合材料的力学性能研究
作者：夏永峰
（山西一建集团有限公司，山西 太原 030012）
摘要：采用硅灰、粉煤灰和矿渣代替大量水泥制备了抗压强度达到200 MPa的超高性能水泥基复合材料（UHPCC）；用粒径2.5 mm的天然砂代替粒径为600 μm的细石英砂。对不同纤维掺量的UHPCC进行了霍普金森压力杆（SHPB）的劈裂试验，研究其动力抗压性能。结果表明，UHPCC的抗冲击性能随纤维掺量的增加而提高，UHPCC的动力抗压强度也随着应变率的增大而提高大。采用有限元软件（LS-DYNA）对UHPCC的整个冲击过程进行了数值模拟。模拟结果表明，Johnson-Holmquist-Concrete materia本构模型可用于混凝土动力抗压的模拟，数值计算结果与试验结果吻合性较好。
关键词：超高性能水泥基复合材料；分离式霍普金森杆；动力抗压强度；数值模拟
中图分类号：TU528 文献标识码：A 文章编号：1001-702X（2020）07-0020-05
Study on dynamic properties of ultra-high performance cement based composites
XIA Yongfeng
（Shanxi First Construction Group Co. Ltd.，Taiyuan 030012，China）
Abstract：UHPCC with compressive strength of 200 MPa was prepared by replacing a large amount of cement with silica fume，fly ash and slag. Use 2.5 mm diameter natural sand instead of 600 μm diameter fine quartz sand. The dynamic compression characteristics of the Hopkinson pressure bar（SHPB） were studied by splitting test of UHPCC with different fiber volume fraction.
The results showed that the impact resistance of UHPCC increased with the increase of fiber volume fraction，and the dynamic compressive strength of UHPCC also increased with the increase of strain rate. In addition，the whole impact process of UHPCC was simulated by LS-DYNA. Numerical simulation shows that Johnson_Holmquist_Concrete materia constitutive model can be used to simulate dynamic compression of concrete. The numerical results are in good agreement with the experimental results.
Key words：ultra-high performance cement based composites，split type SHPB，dynamic compressive strength，numerical simulation