高温后陶瓷纤维增强地聚物混凝土性能与声学损伤的关系

发布时间：2018-04-29 02:20

本文选题：地质聚合物混凝土 + 陶瓷纤维　；参考：《材料热处理学报》2014年03期

【摘要】：以矿渣和粉煤灰为原料,制备了陶瓷纤维增强地质聚合物混凝土(CFRGC)。通过抗压强度试验、超声波测试和裂缝宽度检测,引入小波变换理论,研究了不同温度、不同纤维掺量下CFRGC强度、波速、频谱特征的变化规律以及温度裂缝的开展演化情况。结果表明,高温后CFRGC内部结构受损,导致抗压强度降低,纵波波速和声阻抗减小,温度裂缝宽度增大;声波测试信号经小波分解后在各频段内的功率谱密度分布及能量随损伤的增大有较为明显的变化,某一频段内的信号能量对损伤比波速更敏感;纤维体积掺量为0.3%时,陶瓷纤维对地质聚合物混凝土的高温性能具有良好的改善效果。
[Abstract]:Using slag and fly ash as raw materials, ceramic fiber reinforced geopolymer concrete (CFRGC) was prepared. By means of compressive strength test, ultrasonic testing and crack width testing, wavelet transform theory was introduced to study the variation of CFRGC strength, wave velocity, frequency spectrum characteristics and the evolution of temperature cracks at different temperatures and fiber contents. The results show that the internal structure of CFRGC is damaged after high temperature, which leads to the decrease of compressive strength, the decrease of longitudinal wave velocity and acoustic impedance, and the increase of temperature crack width. After wavelet decomposition, the power spectral density distribution and energy of acoustic wave signal in each frequency band have obvious changes with the increase of damage. The signal energy in a certain frequency band is more sensitive to the damage than the wave velocity, and when the fiber volume is 0.3%, the signal energy is more sensitive to the damage than the wave velocity, and when the fiber volume is 0.3%, Ceramic fiber has a good effect on the high temperature performance of geopolymer concrete.
【作者单位】：空军工程大学机场建筑工程系;西北工业大学力学与土木建筑学院;
【基金】：国家自然科学基金资助项目(51078350);国家自然科学基金资助项目(51208507)
【分类号】：TU528

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