Abstract In this paper, the effects of multiwalled carbon nanotubes (MWCNTs) on the mechanical and damping properties of ultra-high performance concrete (UHPC) were investigated. The results show that the proper amount of MWCNTs can improve mechanical properties as well as the damping properties. For the mechanical properties, the compressive strength and flexural strength of the specimens increased with the increase of MWCNTs content in the range of 0~0.05% (mass ratio to cement). However, when the content of MWCNTs was more than 0.05wt.%, the mechanical properties of UHPC could not be improved continually because too many MWCNTs were difficult to disperse and agglomerated easily in UHPC. Similar laws also have been found for the damping property of UHPC. The loss factor of UHPC increased with the increase of MWCNTs content in the range of 0 ~ 0.05%. The incorporation of MWCNTs would introduce a large number of interfaces into UHPC, the friction and slip between interfaces were the main reasons for the improvement of the damping property of UHPC. However, when the content of MWCNTs was more than 0.05%, it was difficult to disperse effectively. As a result, the overall energy consumption efficiency of MWCNTs was decreased.

中文翻译：

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研究多壁碳纳米管对超高性能混凝土力学和阻尼性能的影响

摘要 本文研究了多壁碳纳米管（MWCNTs）对超高性能混凝土（UHPC）力学和阻尼性能的影响。结果表明，适量的多壁碳纳米管可以提高力学性能和阻尼性能。对于力学性能，试样的抗压强度和抗弯强度随着 MWCNTs 含量在 0~0.05%（与水泥的质量比）范围内的增加而增加。然而，当MWCNTs的含量超过0.05wt.%时，UHPC的力学性能无法持续提高，因为过多的MWCNTs在UHPC中不易分散和团聚。对于 UHPC 的阻尼特性，也发现了类似的规律。在0~0范围内，随着MWCNTs含量的增加，UHPC的损耗因子增加。05%。MWCNTs的加入会在UHPC中引入大量界面，界面之间的摩擦和滑移是UHPC阻尼性能提高的主要原因。然而，当MWCNTs的含量超过0.05%时，难以有效分散。结果，MWCNTs的整体能量消耗效率降低。