碳纳米管韧性混凝土动态劈裂性能研究  

ON THE DYNAMIC SPLITTING PERFORMANCE OF CARBON NANOTUBES MODIFIED ULTRA-HIGH TOUGHNESS CEMENTITIOUS COMPOSITES

作　　者：徐世烺[1] 陈宇[1] 李庆华[1] XU Shilang;CHEN Yu;LI Qinghua(Institute of Advanced Engineering Structures,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]浙江大学高性能结构研究所,杭州310058

出　　处：《低温建筑技术》2023年第7期23-27,共5页Low Temperature Architecture Technology

基　　金：国家自然科学基金项目(51878601)。

摘　　要：文中通过霍普金森杆技术(SHPB)研究碳纳米管(CNTs)掺量对超高韧性水泥基材料(UHTCC)动态劈裂性能影响规律。试验结果表明,在静态荷载作用下,CNTs-UHTCC劈裂强度在掺量为0.2wt.%时达到峰值,相比于对照组提高了4.46%。在动态荷载作用下,CNTs-UHTCC劈裂强度表现出显著的应变率敏感性。建立5组材料的动态劈裂强度增长因子-应变率预测模型,结果显示在应变率2.05~13.25 s^(-1)范围内模型与试验结果吻合良好。研究为碳纳米管改性超高韧性水泥基材料的工程应用提供参考依据。The effectiveness of carbon nanotubes(CNTs)content on the dynamic splitting performance of ultra-high toughness cementitious composites(UHTCC)is studied by SHPB technique.The results show that the static splitting tensile strength of CNTs-UHTCC reaches its peak value at 0.2wt.%content,which increases by 4.46%compared with the control group.Under dynamic load,the splitting tensile strength of CNTs-UHTCC has significant strain rate sensitivity.The prediction model of the dynamic splitting tensile strength via strain rate of the materials is established,which is in good agreement with the experimental results in the strain rate range of approximately 2.05~13.25 s^(-1).This paper may provide the reference for engineering applications of carbon nanotubes modified ultra-high tough⁃ness cementitious composites.

关 键 词：碳纳米管 UHTCC 劈裂拉伸 动态劈裂强度增长因子 

分 类 号：TU528.57[建筑科学—建筑技术科学]