建筑结构学报2025，Vol.46Issue(5)：186-199,14.DOI:10.14006/j.jzjgxb.2024.0227
基于数字图像相关技术与声发射的ECC-煤矸石混凝土界面黏结性能试验研究
Experimental study on bonding behavior of ECC-coal gangue concrete interface based on DIC and acoustic emission
摘要
Abstract
To study the shear performance and failure mechanism of the bonding interface between engineered cementitious composites(ECC)and coal gangue concrete,10 Z-shaped shear specimens were designed for the direct shear test,including different keyway sizes(keyway depth,keyway angle,keyway number),male and female key teeth materials(ECC,coal gangue)and shear reinforcement ratio of ECC(0,0.34％,1.34％).With the aid of DIC and acoustic emission instruments,the interface failure mode,load-displacement curve,and acoustic emission characteristic parameters were analyzed.The experimental results indicate that the failure modes of specimens with keyways are divided into three categories:shear failure of key teeth,shear failure of keyways,and combined shear failure of both key teeth and keyways.Increasing the shear reinforcement ratio can significantly improve the shear capacity and peak displacement of the bonding interface.Among the keyway parameters,the primary and secondary relations of the influence degree of shear bearing capacity are the number of keyways,the depth of keyways,and the angle of keyways.Through DIC,it is found that the strain is concentrated near the shear interface during the shear process.Through acoustic emission monitoring,it is found that the ringing count and energy release rate in the elastic stage are mainly distributed in the range of 0～200 and 0～130 mV·μs,respectively.At the stage of fracture development,the ringing count in the range of 200～1000 and the energy release rate in the range of 130～1500 mV·μs began to appear.In the analysis of microcrack evolution,the high-frequency signal with the average frequency in the range of 200～350 kHz is used as the early warning information of specimen failure.Based on the test data,the calculation method for the shear capacity of ECC-coal gangue concrete bonding surface was proposed.The calculated values are in good agreement with the experimental values.关键词
水泥基复合材料/煤矸石混凝土/直剪试验/数字图像相关技术/声发射/受剪性能Key words
engineered cementitious composites/coal gangue concrete/direct shear test/DIC/acoustic emission/shear performance分类
建筑与水利引用本文复制引用
赵卫平,李广杰,韩飚,李昕鑫,徐旸..基于数字图像相关技术与声发射的ECC-煤矸石混凝土界面黏结性能试验研究[J].建筑结构学报,2025,46(5):186-199,14.基金项目
国家自然科学基金联合基金重点项目(U22A20244),国家自然科学基金项目(52278467). （U22A20244）
