基于声发射和数字图像相关技术的不同粗骨料粒径混凝土损伤特性  

Damage Characteristics of Concrete with Different Coarse Aggregate Sizes based on Acoustic Emission and Digital Image Correlation Techniques

作　　者：虞爱平 李秀鑫 程梓宸 苗天娇 刘涛 虞小平 YU Aiping;LI Xiuxin;CHENG Zichen;MIAO Tianjiao;LIU Tao;YU Xiaoping(Guangxi Key Laboratory of Green Building Materials and Construction Industrialization,Guilin 541004,China;Department of Civil and Surveying Engineering,Guilin University of Technology AT Nanning,Chongzuo 532100,China)

机构地区：[1]广西绿色建材与建筑工业化重点实验室,广西桂林541004 [2]桂林理工大学南宁分校土木与测绘工程系,广西崇左532100

出　　处：《河南科技大学学报（自然科学版）》2024年第5期57-67,78,M0005,M0006,共14页Journal of Henan University of Science And Technology:Natural Science

基　　金：国家自然科学基金项目(51968014);广西自然科学基金项目(2022GXNSFAA035553)。

摘　　要：为研究不同粗骨料粒径混凝土的损伤特性,采用声发射和数字图像相关技术对4.75~9.50 mm、9.50~16.00 mm、16.00~19.00 mm、19.00~26.50 mm、26.50~31.50 mm和连续粒径6组混凝土试块进行单轴压缩试验。从微观尺度和宏观尺度实时采集混凝土试块破坏全过程的损伤信息。基于AE能量计数建立了不同粗骨料粒径混凝土试块的损伤评价模型。结果表明:基于AE能量计数和b值的演化规律,6组混凝土试块的损伤过程可以划分为3个损伤阶段:初始阶段、裂缝稳定发展阶段和裂缝快速扩展阶段。DIC技术捕捉到的位移云图可以从宏观尺度上解释AE参数的微观尺度信息,为单轴压缩作用下损伤阶段的划分提供有力的依据。不同粗骨料粒径混凝土试块内部结构存在差异性,会影响混凝土最终裂缝快速扩展的速率。建立的损伤评价模型可以很好地表征不同粗骨料粒径混凝土的损伤阶段,实现定量分析和评价。To study the damage characteristics of concrete with different coarse aggregate sizes,uniaxial compression tests were carried out on 6 groups of concrete specimens with 4.75~9.50 mm,9.50~16.00 mm,16.00~19.00 mm,19.00~26.50 mm,26.50~31.50 mm and continuous particle sizes by using acoustic emission(AE)and digital image correlation(DIC)technology.Damage information of the entire failure process of the concrete specimens was collected in real-time from both micro-scale and macro-scale.Damage evaluation model for concrete specimens with different coarse aggregate sizes was established based on AE energy count.The results show that based on the evolution laws of the AE energy count and b value,the damage process of 6 groups of concrete specimens can be divided into 3 damage stages:the initial stage,the cracks stable development stage,and the cracks rapid expansion stage.The displacement cloud diagrams captured by DIC technology can explain the micro-scale information of AE parameters from macro-scale and provide a strong basis for the classification of damage stages under uniaxial compression.The concrete specimens with different coarse aggregate sizes exhibit variations in internal structure,which affect the rate of rapid crack propagation in concrete.The established damage evaluation model can effectively characterize the damage stages of concrete with different coarse aggregate sizes,and realize quantitative analysis and evaluation.

关 键 词：粗骨料粒径 声发射 数字图像相关 损伤特性 损伤评价模型 

分 类 号：TU528[建筑科学—建筑技术科学] TU112