纳米材料对超高性能混凝土动态力学特性的影响实验研究

Experimental Study on Influence of Nano-Particles on Dynamic Mechanical Properties of Ultra-High Performance Concrete

对掺入不同种类和含量纳米材料的超高性能混凝土分别进行了静、动态压缩和劈裂试验,分析了纳米材料种类及其含量对超高性能混凝土材料动态力学特性的影响,给出了超高性能混凝土动态增长因子曲线。结果表明:超高性能混凝土为应变率敏感性材料,超高性能混凝土的动态强度随着应变率的增大而增强;纳米材料种类对超高性能混凝土动态强度的影响不明显,但对其动态增长因子影响比较显著;纳米材料含量对超高性能混凝土动态强度和动态增长因子影响明显,适宜的掺量能够更有效地改善超高性能混凝土的动态力学性能。

In this paper, for the incorporation of different types and content of nano particles ultra-high performance concrete （UHPC） were respectively compression and splitting tests under static and dynamic load. Effects of the different types of nano particles and nano particles content to the mechanical properties of UHPC were analysed, and there after corresponding dynamic increase factor （DIF） diagrams were developed. It has been found that, concrete material is sensitive to the strain rate, the dynamic strength increases with the rise of strain rates. The nano particles have very limited effect on the dynamic strength of UHPC, while significantly influence the DIF values ; the content of nano particles have greater affect on the dynamic strength and DIF of UHPC, the proper content of nano particles will be improve the properties of UHPC obvious.