定向钢纤维增强地质聚合物弯曲破坏的声发射特性

doi:10.11896/cldb.20030057

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Abstract The steel fiber was aligned by applying a uniform magnetic field to the steel fiber reinforced geopolymer mixture. The aligned steel fiber reinforced geopolymer notched beam was prepared. The acoustic emission of the beam specimen was monitored throughout the test. The effect of fiber orientation on the bending performance of geopolymer beam and the acoustic emission characteristics of the failure process was investigated in this study. The results show that the mechanical properties of aligned steel fiber reinforced geopolymer, including bending strength, crack opening displacement and fracture energy at peak load, are notably higher than those of hybrid steel fiber reinforced geopolymer. The load curve of aligned steel fiber reinforced geopolymer shows obvious sawtooth fluctuation after peak load. In the ascending branch of sawtooth fluctuation, the amplitude of acoustic emission is less than 70 dB, which corresponds to low energy rate and low wave strike rate. In the descending branch of sawtooth fluctuation, a small number of wave hits with amplitude greater than 70 dB and energy over 90% of total energy appeared. It is therefore inferred that two microscopic loss mechanism of matrix cracking and fiber pull-out dominate alternately in the process of sawtooth fluctuation.

Key words： aligned steel fiber geopolymer three-point bending acoustic emission sawtooth fluctuation

Published: 01 July 2021

CLC number:

TU528.572

Fund:This work was financially supported by General Program of National Natural Science Foundation of China(51578424), Science and Technology Project of Zhejiang Province(2017C33242),Wenzhou Public Welfare Science and Technology Project(S20140010).

About author:: Zhewei Wang has been studying for his master's degree at Wenzhou University since September 2018. He mainly engaged in the geopolymer materials under the supervision of professor Huafei Zhou and associate professor Ziling Xie.
Huafei Zhou, professor, Ph. D., master's supervisor. He is mainly engaged in research on structural health testing. He presided over or mainly participated in more than 10 scientific research projects including the Natio-nal Natural Science Foundation of China, the Provincial Qianjiang Talent Program, the Provincial Natural Science Foundation, the Hong Kong Research and Grants Agency projects, published more than 40 domestic and foreign academic journals and international academic conference papers, including 10 SCI papers, with a total of more than 100 citations; 10 authorized or applied for patents.
Ziling Xie, associate professor, Ph. D., master's supervisor. He is mainly engaged in the research and development of geopolymer materials and their application in the solidification of hazardous solid waste, and research on the damage and fracture behavior of quasi-brittle materials.

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Cite this article:

WANG Zhewei,ZHOU Huafei,XIE Ziling. Acoustic Emission Characteristics of Aligned Steel Fiber Reinforced Geopolymer Subjected to Bending Failure[J]. Materials Reports, 2021, 35(12): 12214-12219.

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http://www.mater-rep.com/EN/10.11896/cldb.20030057 OR http://www.mater-rep.com/EN/Y2021/V35/I12/12214

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