混凝土及其组成材料单轴破坏的声发射特征  

Acoustic emission characteristics of concrete and its constituent materials under uniaxial failure

作　　者：王立柱 赵云峰 郭嘉豪 张嘉乐 WANG Lizhu;ZHAO Yunfeng;GUO Jiahao;ZHANG Jiae(School of Urban Construction,Yangtze University,Jingzhou 434023,Hubei,P.R.China)

机构地区：[1]长江大学城市建设学院,湖北荆州434023

出　　处：《土木与环境工程学报(中英文)》2025年第2期174-181,共8页Journal of Civil and Environmental Engineering

基　　金：国家自然科学基金(52204201、52178313)。

摘　　要：为探究混凝土及其组成材料损伤破坏的声发射特征之间的关系,开展了混凝土、水泥砂浆和石灰岩单轴压缩试验,并同步采集三者破坏过程中的声发射信号,统计分析三者力学特性与声发射能量谱、幅值与频率、峰值频率以及声发射b值等参数。结果表明:在濒临破坏时,三者产生的声发射信号峰值频率与幅度均会上升;三者的频率分布近似呈正态分布,均在90~120kHz区间占比最多;水泥砂浆与混凝土声发射动态b值趋势平缓,维持在相对较高数值区间,石灰岩动态b值呈先增后减趋势,在临近应力峰值时快速下降,预示着主破裂的来临;混凝土的整体b值与峰值频率分布均介于石灰岩和水泥砂浆之间,水泥砂浆与石灰岩混合之后的声发射整体b值与混凝土接近,体现了混凝土与其组成材料破坏声发射特征的叠加效应。To investigate the relationship between concrete and its constituent materials in the acoustic emission characteristics of the damage,uniaxial compression tests of concrete,cement mortar and limestone were carried out,and the acoustic emission signals during the failure process of the three were collected simultaneously.The mechanical properties,acoustic emission energy spectrum,amplitude,frequency,peak frequency and acoustic emission b-value of the three materials were statistically analyzed.The results show that the peak frequency and amplitude of the acoustic emission signals from all three specimens increase at the time of imminent damage.The frequency distribution of all three shows a normal distribution,with the largest proportion in the 90-120 kHz range.The dynamic b-value trends for cement mortar and concrete do not fluctuate much and remain in a relatively high value range,the dynamic b-value of limestone shows a trend of increasing first and then decreasing,and decreases rapidly near the peak stress,indicating the coming of main fracture.The overall b-value and peak frequency distribution of concrete are between limestone and cement mortar,the overall b-value of cement mortar mixed with limestone is close to that of concrete,this reflects the superposition effect of acoustic emission characteristics of the failure of concrete and its constituent materials.

关 键 词：混凝土 损伤破坏 声发射 峰值频率 动态b值 叠加效应 

分 类 号：TU528[建筑科学—建筑技术科学]