弧型和端钩型钢纤维与UHPC基体界面黏结性能研究  

Research on the bond performance of arc-shaped and hooked-end steel fibers with UHPC matrix interface

作　　者：邓宗才[1] 王梦新 王宏君 陈相宇 Deng Zongcai;Wang Mengxin;Wang Hongjun;Chen Xiangyu(Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China;Zhitai Technology New Materials(Jiangsu)Co.Ltd,Suzhou 215000,China)

机构地区：[1]北京工业大学城市与工程安全减灾省部共建教育部重点实验室,北京100124 [2]致泰科技新材料(江苏)有限公司,江苏苏州215000

出　　处：《建筑科学》2024年第11期1-8,共8页Building Science

摘　　要：为研究弧型和端钩型钢纤维与UHPC基体的界面黏结性能,通过单根纤维拉拔试验得到纤维拉拔荷载-位移曲线,分析了纤维埋深(4、5、6mm)、纤维直径(0.2、0.35、0.4mm)和纤维形状(弧型、端钩型)对UHPC基体中钢纤维拔出行为的影响。结果表明:所有试件的失效模式均表现为钢纤维完全拔出;端钩型钢纤维埋深增加,钢纤维最大拉拔荷载、最大拉拔应力、钢纤维抗拉强度利用率以及拉拔功均呈不断提高的趋势,而等效黏结强度和平均黏结强度却呈减小的趋势;端钩型钢纤维直径增加,钢纤维的最大拉拔应力减小,拉拔功、等效黏结强度和平均黏结强度均增大;弧型钢纤维比端钩型钢纤维与UHPC基体的界面黏结性能更优越,各项黏结性能评价指标均大幅度提升。In order to study the bonding performance of arc-type and end-hook-type steel fibers at the interface with the UHPC matrix,the fiber pullout load-displacement curves are obtained from the single fiber pullout tests,and the effects of fiber embedment depths(4,5,and 6mm),fiber diameters(0.2,0.35,and 0.4mm),and fiber shapes(arc-type and end-hook-type)on the pullout behaviors of steel fibers in the UHPC matrix are analyzed.The results show that:the failure mode of all specimens is complete pullout of steel fibers;the maximum pullout load,maximum pullout stress,utilization of steel fiber tensile strength,and pullout work of steel fibers increase with the increase of the embedment depth of end-hooked steel fibers,while the equivalent bond strength and average bond strength show a decreasing trend;the diameter of end-hooked steel fibers increases,and the pullout work,equivalent bond strength,and average bond strength of steel fibers increase,and the maximum tensile strength and average bond strength of steel fibers increase,and the maximum tensile strength and average bond strength of steel fibers increase.Increasing the diameter of end-hooked steel fibers,the maximum pullout stress of steel fibers decreases,and the pullout work,equivalent bond strength and average bond strength all increase;the interfacial bonding performance of arc-type steel fibers is more superior than that of end-hook type steel fibers and UHPC matrix,and all the evaluation indexes of the bonding performance are greatly improved.

关 键 词：超高性能混凝土 钢纤维 拉拔 界面黏结性能 

分 类 号：TU528[建筑科学—建筑技术科学]