碳纳米管与纳米硅灰提升水泥基材料的力学及阻尼性能研究  

Mechanical and damping properties of cement-based materials enhanced by carbon nanotubes and nano silica fume

作　　者：刘彬[1] 王激扬[2] 胡兴荣 吴经纬 姚士辉 刘修良 LIU Bin;WANG Jiyang;HU Xingrong;WU Jingwei;YAO Shihui;LIU Xiuliang(Zhejiang College of Construction,Hangzhou 311231,China;College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China;Hangzhou Future SCI-TECH City Construction Co.,Ltd.,Hangzhou 311100,China;Hangzhou Chengjing Landscape Design Co.,Ltd.,Hangzhou 310004,China)

机构地区：[1]浙江建设职业技术学院,浙江杭州311231 [2]浙江大学高性能结构研究所,浙江杭州310058 [3]杭州未来科技城建设有限公司,浙江杭州311100 [4]杭州城境景观设计有限公司,浙江杭州310004

出　　处：《混凝土》2022年第12期77-81,85,共6页Concrete

基　　金：国家自然科学基金面上项目(51578495);浙江省基础公益研究计划(LGG22E080004);住房和城乡建设部科技项目(2019-K-041)。

摘　　要：基于超声和离心处理获取的碳纳米管均匀分散液,制备了17组掺量不同的碳纳米管-纳米硅灰-水泥基复合材料,进行了力学性能和阻尼性能的试验,结合热重分析、压汞试验及扫描电镜观测,研究了力学性能和阻尼性能提升的微观机理。研究表明,纳米硅灰能作为分散介质分散碳纳米管,并改善碳纳米管在水泥基体中的分散。同时,纳米硅灰能够促进水泥水化反应,明显降低复合材料的平均孔径和临界孔径,这解释了纳米硅灰和碳纳米管复掺水泥基材料的抗压强度、抗折强度、损耗因子最高分别提高25%、53%、24%的微观形成机理。17 groups of carbon nanotubes-nano silica fume-cement matrix composites with different dosages were prepared based on uniform dispersion solution of carbon nanotubes obtained by ultrasonic and centrifugal treatment.The mechanical and damping properties were tested,and the microscopic mechanism of mechanical properties and damping properties was studied by combining thermogravimetric analysis,mercury injection test and scanning electron microscope observation.The study shows that silica fume can be used as dispersion medium to disperse carbon nanotubes and improve the dispersion of carbon nanotubes in cement matrix.At the same time,nano-silica fume can improve the hydration reaction of cement,and significantly reduce the average pore size and critical pore size of the composite material,which explains why the compressive strength,bending strength and loss factor of nano-silica fume and carbon nanotube composite cement-based materials are increased by 25%,53%and 24%,respectively.

关 键 词：碳纳米管 纳米硅灰 水泥基复合材料 阻尼性能 力学性能 

分 类 号：TU528.041[建筑科学—建筑技术科学]