湖南大学学报（自然科学版）2024，Vol.51Issue(3)：161-169,9.DOI:10.16339/j.cnki.hdxbzkb.2024038
钢纤维间距对UHPC双丝拉拔性能的影响
Effect of Steel Fiber Spacing on Double Fibers Pullout Performance of UHPC
摘要
Abstract
The influence of steel fiber spacing(2,4,6,8,10 and 12 mm)on the pullout performance of steel fiber in ultra-high performance concrete(UHPC)matrix was studied by the double steel fiber pullout test.Six sets of double fiber specimens and one set of single fiber specimens embedded with 0.2 mm copper-plated straight round steel fibers were fabricated.Based on the parameters of the pullout load-slip curve,average bond strength,and maximum pullout stress,and combined with scanning electron microscope(SEM),the micro-appearance of steel fibers after pulled out,the micro-morphology of UHPC matrix tunnel and the failure part were observed.The influence of steel fiber spacing on the pullout performance between UHPC matrix and steel fibers was analyzed.The steel fiber pullout test results showed certain discreteness;the maximum pullout load of double fibers pullout test was less than twice that of the corresponding single fiber pullout test.The steel fiber and UHPC matrix tunnel had different degrees of damage.The scratches on the surface of steel fiber and the holes in the matrix tunnel of double fiber specimen were more serious than those of the single fiber specimen,while the inner wall of the single fiber specimen was relatively complete.关键词
超高性能混凝土(UHPC)/钢纤维/双丝拉拔/黏结性能/SEM微观形貌Key words
ultra-high performance concrete(UHPC)/steel fiber/double fibers pullout/bonding performance/SEM microtopography分类
交通工程引用本文复制引用
袁明,朱楠萱,颜东煌,吴晓娟,黄练..钢纤维间距对UHPC双丝拉拔性能的影响[J].湖南大学学报（自然科学版）,2024,51(3):161-169,9.基金项目
国家自然科学基金资助项目(52078054,51878073),National Natural Science Foundation of China(52078054,51878073) （52078054,51878073）
湖南省交通科技项目(201932),Department of Transportation of Hunan Province(201932) （201932）
湖南省自然科学基金资助项目(2021jj30730),Natural Science Foundation of Hunan Province(2021jj30730) （2021jj30730）
湖南省研究生科研创新项目(CX20200832,CX20190650),Postgraduate Research Innovation Project of Hunan Province(CX20200832,CX20190650) （CX20200832,CX20190650）
