纳米纤维对钢纤维-UHPC基体界面黏结性能的影响  

Effect of nano-fiber on interfacial bonding performance of steel fiber-UHPC matrix

作　　者：吉世林 JI Shilin(China Railway 11th Bureau Group third Engineering Co.,Ltd.,Shiyan 442000,China)

机构地区：[1]中铁十一局集团第三工程有限公司,湖北十堰442000

出　　处：《混凝土与水泥制品》2024年第11期60-64,69,共6页China Concrete and Cement Products

摘　　要：研究了钢纤维(SF)埋置深度(5、10、15、20 mm)、碳纳米管(CNTs)掺量(0.1%、0.2%、0.3%、0.4%)、碳酸钙晶须(CAS)掺量(1%、2%、3%、4%)对SF-UHPC基体界面黏结性能的影响,并进行了微观机理分析。结果表明:随着SF埋置深度的增加,拉拔峰值荷载和SF-UHPC基体的拉拔能均呈增大趋势,但界面黏结强度呈降低趋势;CNTs的掺入虽降低了SF-UHPC基体的拉拔能,但适量CNTs可提升拉拔峰值荷载和SF-UHPC基体的界面黏结强度;掺入适量CAS可显著改善SF-UHPC基体的界面黏结性能;相较于CNTs,CAS对SF-UHPC基体界面黏结性能改善效果相对更好。The effects of the embedment depth(5,10,15,20 mm)of steel fiber(SF),the content(0.1%,0.2%,0.3%,0.4%)of carbon nanotube(CNTs),and the content(1%,2%,3%,and 4%)of calcium carbonate crystal whisker(CAS)on the interfacial bonding performance of SF-UHPC matrix were investigated,and the micromechanisms analysis was conducted.The results show that,with the increase of the embedment depth of SF,the peak pull-out load and the pull-out energy of SF-UHPC matrix show an increasing trend,but the interfacial bonding strength shows a decreasing trend.Although the incorporation of CNTs reduces the pull-out energy of SF-UHPC matrix,the peak pull-out load and the interfacial bonding strength of SF-UHPC matrix can be improved with the appropriate content of CNTs.The incorporation of appropriate content of CAS can significantly improve the interfacial bonding performance of SF-UHPC matrix.Compared with CNTs,CAS has a relatively better improvement effect on the interfacial bonding performance of SF-UHPC matrix.

关 键 词：钢纤维(SF) 超高性能混凝土(UHPC) 碳纳米管(CNTs) 碳酸钙晶须(CAS) 界面黏结性能 微观形貌 

分 类 号：TU528.572[建筑科学—建筑技术科学]