摘要
自行研发的纤维定位装置可较为精准地控制钢纤维的空间位置,基于此,研究了钢纤维埋置深度、直径和埋置角度对超高性能纤维增强混凝土(UHPFRC)中钢纤维拔出行为的影响。结果表明:随着钢纤维埋置深度增加,钢纤维最大拔出力、拔出功、最大拔出应力及钢纤维强度利用率均呈不断提高的趋势,而最大平均黏结强度却呈减小的趋势;随着钢纤维直径增加,钢纤维最大拔出力、拔出功和最大平均黏结强度相应增加,而钢纤维强度利用率和最大拔出应力均减小;随着钢纤维埋置角度增大,钢纤维最大拔出力和拔出功呈先上升后下降的趋势,分别在埋置角度为45°和30°时达到最大,而埋置角度为75°时,试件破坏模式表现为钢纤维拉断失效。
Based on the self-developed steel fiber position device that can accurately control the spatial position of steel fiber,the effects of steel fiber embedded depth,diameter and embedded angle on the pull-out behavior of steel fiber in ultra-high performance fiber reinforced concrete(UHPFRC)were studied.The results indicate that the maximum pull-out force,pull-out work,maximum pull-out stress and strength utilization rate of steel fiber increase with the increase of steel fiber embedded depth.However,the maximum average bond strength decreases with the increase of steel fiber embedded depth.With the increase of steel fiber diameter,the maximum pull-out force,pull-out work and maximum average bond strength of steel fiber increase correspondingly,while the strength utilization rate and maximum pull-out stress of steel fiber decrease.With the increase of steel fiber embedded angle,the maximum pull-out force and pull-out work of steel fiber increase first and then decrease.The maximum pull-out force and pull-out work reach the maximum value at 45°and 30°of embedded angle,respectively.When the embedded angle is 75°,the failure mode of specimen is that the steel fiber is broken.
作者
龚明子
潘阿馨
张子龙
王涛
饶先鹏
陈晨
黄伟
GONG Mingzi;PAN Axin;ZHANG Zilong;WANG Tao;RAO Xianpeng;CHEN Chen;HUANG Wei(CCCC Green Construction(Xiamen)Technology Co.,Ltd.,Xiamen 361000,China;College of Civil Engineering,Fuzhou University,Fuzhou 350116,China;Institute of Advanced Manufacturing,Fuzhou University,Jinjiang 362200,China)
出处
《硅酸盐通报》
CAS
北大核心
2023年第8期2764-2772,共9页
Bulletin of the Chinese Ceramic Society
基金
“十三五”国家重点研发计划(2018YFC0705403)
福建省自然科学基金(2021J05124)
福建省中科院STS计划配套项目(2022T3032)
泉州市科技计划项目(2021N176S)
厦门市建设局建设科技项目(XJK2022-1-20)。
关键词
超高性能纤维增强混凝土
钢纤维
拉拔
埋置参数
界面性能
ultra-high performance fiber reinforced concrete
steel fiber
pull-out
embedded parameter
interface performance
