混凝土及其组成材料单轴破坏声发射特征研究
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长江大学

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国家自然科学基金(52204201)


Study on acoustic emission characteristics of concrete and its constituent materials under uniaxial failure
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Yangtze University

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National Natural Science Foundation of China (No. 52204201)

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    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,开展了混凝土及其组成材料(水泥砂浆和石灰岩)单轴压缩试验,并统计分析了三者破坏过程中的声发射特征。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现正态分布,均在90~120 kHz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值呈现先增后减的趋势,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的声发射特征的叠加效应。

    Abstract:

    To investigate the relationship between the acoustic emission characteristics of the damage of concrete and its constituent materials, uniaxial compression tests on concrete and its constituent materials (cement mortar and limestone) were carried out and the acoustic emission characteristics of the three during the damage process were statistically analysed. 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. Dynamic b-value trends for cement mortar and concrete do not fluctuate much and remain at 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.

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  • 收稿日期:2022-11-01
  • 最后修改日期:2022-11-22
  • 录用日期:2023-01-11
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