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In order to study the damage behavior of fiber reinforced concrete at high temperature, the acoustic characteristics of hybrid fiber reinforced concrete (PVA fiber and basalt fiber) at different temperatures were tested, and the mechanism was explained from the microscopic level by combining the results of the SEM. The results show that with the rising of temperature, the degree of ultrasonic waveform distortion is more significant, and the attenuation of waveform amplitude is gradually intensified; The incorporation of fiber or the increase of temperature will reduce the amplitude of the dominant frequency of the waveform and increase the energy dissipation caused by the ultrasonic penetration of the specimen. At high temperature, after PVA fiber is melted, a large number of pores remain and gradually form connecting pores, which promote the release of pore steam pressure and alleviate high-temperature damage, while basalt fiber continues to play a bridging effect to inhibit the continuous development of high-temperature cracks.

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为研究纤维混凝土高温损伤行为,开展不同温度下混杂纤维混凝土(PVA纤维和玄武岩纤维)的声学特性试验,并结合电镜扫描SEM结果从微观层面进行机理解释。结果表明,随温度不断攀升,超声波波形畸变程度越显著,波形幅值衰减逐渐加剧;掺入纤维和温度升高均会导致波形主频幅值降低,加剧超声波穿透试件引起的能量耗散。高温下,PVA纤维熔化后残留大量孔道,并逐渐形成连通孔,促进孔隙蒸气压力的释放,缓解高温损伤,而玄武岩纤维继续发挥桥连效应,抑制高温裂纹的不断发展。

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朱从香(1978-),女,硕士、副教授,研究方向为混凝土结构耐久性,E-mail:

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朱从香(1978-),女,硕士、副教授,研究方向为混凝土结构耐久性,E-mail:

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朱从香(1978-),女,硕士、副教授,研究方向为混凝土结构耐久性,E-mail:

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基于声学特性的混杂纤维混凝土高温损伤行为试验
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朱从香 1 , 徐俊 2
水电能源科学 | 水利水电工程 2023,41(7): 184-187
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水电能源科学 | 水利水电工程 2023, 41(7): 184-187
基于声学特性的混杂纤维混凝土高温损伤行为试验
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朱从香1 , 徐俊2
作者信息
  • 1.扬州工业职业技术学院,江苏 扬州 225000
  • 2.江苏科技大学土木工程与建筑学院,江苏 镇江 212100
  • 朱从香(1978-),女,硕士、副教授,研究方向为混凝土结构耐久性,E-mail:

Experimental Study on High Temperature Damage Behavior of Hybrid Fiber Reinforced Concrete Based on Acoustic Properties
Cong-xiang ZHU1 , Jun XU2
Affiliations
  • 1.Yangzhou Polytechnic Institute, Yangzhou 225000, China
  • 2.College of Civil Engineering and Architecture, Jiangsu University of Science and Technology, Zhenjiang 212100, China
出版时间: 2023-07-25 doi: 10.20040/j.cnki.1000-7709.2023.20230039
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为研究纤维混凝土高温损伤行为,开展不同温度下混杂纤维混凝土(PVA纤维和玄武岩纤维)的声学特性试验,并结合电镜扫描SEM结果从微观层面进行机理解释。结果表明,随温度不断攀升,超声波波形畸变程度越显著,波形幅值衰减逐渐加剧;掺入纤维和温度升高均会导致波形主频幅值降低,加剧超声波穿透试件引起的能量耗散。高温下,PVA纤维熔化后残留大量孔道,并逐渐形成连通孔,促进孔隙蒸气压力的释放,缓解高温损伤,而玄武岩纤维继续发挥桥连效应,抑制高温裂纹的不断发展。

混杂纤维混凝土  /  声学特性  /  高温  /  损伤行为  /  蒸汽压力

In order to study the damage behavior of fiber reinforced concrete at high temperature, the acoustic characteristics of hybrid fiber reinforced concrete (PVA fiber and basalt fiber) at different temperatures were tested, and the mechanism was explained from the microscopic level by combining the results of the SEM. The results show that with the rising of temperature, the degree of ultrasonic waveform distortion is more significant, and the attenuation of waveform amplitude is gradually intensified; The incorporation of fiber or the increase of temperature will reduce the amplitude of the dominant frequency of the waveform and increase the energy dissipation caused by the ultrasonic penetration of the specimen. At high temperature, after PVA fiber is melted, a large number of pores remain and gradually form connecting pores, which promote the release of pore steam pressure and alleviate high-temperature damage, while basalt fiber continues to play a bridging effect to inhibit the continuous development of high-temperature cracks.

hybrid fiber concrete  /  acoustic characteristics  /  high temperature  /  damage behavior  /  steam pressure
朱从香, 徐俊. 基于声学特性的混杂纤维混凝土高温损伤行为试验. 水电能源科学, 2023 , 41 (7) : 184 -187 . DOI: 10.20040/j.cnki.1000-7709.2023.20230039
Cong-xiang ZHU, Jun XU. Experimental Study on High Temperature Damage Behavior of Hybrid Fiber Reinforced Concrete Based on Acoustic Properties[J]. Water Resources and Power, 2023 , 41 (7) : 184 -187 . DOI: 10.20040/j.cnki.1000-7709.2023.20230039
  • 国家自然科学基金项目(52108216)
  • 扬州市装配式建筑技术公共服务平台(YZ2022149)
  • 2021年校级科研项目(2021xjzk015)
2023年第41卷第7期
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doi: 10.20040/j.cnki.1000-7709.2023.20230039
  • 接收时间:2023-01-09
  • 首发时间:2026-01-28
  • 出版时间:2023-07-25
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  • 收稿日期:2023-01-09
  • 修回日期:2023-02-20
基金
国家自然科学基金项目(52108216)
扬州市装配式建筑技术公共服务平台(YZ2022149)
2021年校级科研项目(2021xjzk015)
作者信息
    1.扬州工业职业技术学院,江苏 扬州 225000
    2.江苏科技大学土木工程与建筑学院,江苏 镇江 212100
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2种不同金属材料的力学参数

Family
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Number of
genus
种数
Number of
species
占总种数比例
Percentage of
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Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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