Acoustic emission by steel fiber reinforced concrete under tensile damage

Wang Yan; Ge Lu; Chen Shi Jie; Zhou Li; Zhang Ting Ting

doi:10.3139/120.111048

Article

Acoustic emission by steel fiber reinforced concrete under tensile damage

Wang Yan , Ge Lu , Chen Shi Jie , Zhou Li and Zhang Ting Ting

Published/Copyright: July 10, 2017

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From the journal Materials Testing Volume 59 Issue 7-8

Abstract

In order to study the uniaxial tensile damage characteristics of steel fiber reinforced concrete at medium loading rate, tests at different steel fiber contents up to 1.5 % are performed and the acoustic emission wavelet energy spectrum is analyzed. Within the 20 to 40 kHz band, the peak frequency decreases with the increase of the steel fiber content at all damage stages. The peak frequency is affected by the size and the number of cracks, while the latter has a stronger effect. With the accumulation of damage, the amplitude and the energy of the waveform increase, the energy proportion in the low frequency bands also shows the same trend, but the peak frequency decreases. Thus, a nondestructive means for identifying the damage stage is provided.

Kurzfassung

Die Schadenscharakteristik von faserverstärktem Beton mit unterschiedlichem Gehalt von Stahlfasern bis zu 1,5 % wird bei mittleren einachsigen Belastungen mittels Wavelet-Analyse des Energie-Spektrums der akustischen Emission untersucht. Im Bereich von 20 bis 40 kHz sinkt die maximale Frequenz der Signale mit steigendem Fasergehalt in allen Stadien der Schädigung. Sie ist von der Größe und Häufigkeit der Risse abhängig, wobei die Anzahl der Risse einen größeren Einfluss hat. Die Amplituden und die Energie der Signale steigen mit zunehmender Schadensakkumulation an, auch der Energiebeitrag in den niedrigen Frequenzbändern nimmt etwas zu, die Maximalfrequenz nimmt jedoch ab. Somit ergibt sich ein zerstörungsfreies Verfahren für die Ermittlung des Schädigungsniveaus.

*Correspondence Address, Assoc. Prof. Wang Yan, College of Civil and Transport Engineering., Hohai University, Nanjing, 210098, China, E-mail: drwanghhu@126.com

Assoc. Prof. Wang Yan, born in 1980, studied Civil Engineering at Hohai University in Nanjing, China. He received his PhD on acoustic emission of concrete in 2009. From 2011 to 2015, he participated in a mobile station of a water conservancy project. Currently, he is Associate Professor in the College of Civil and Transport Enignieeting, Honai University. His present focus of research lies on damage studies of concrete based on acoustic emission and ultrasonic techniques.

Ge Lu, born in 1992, holds a Master of Engineering and studied Civil Engineering at Hohai University, Nanjing, China. She completed her Bachelor's degree in 2015. Her research focuses on the damage process of concrete under dynamic load based on the acoustic emission wavelet analysis.

Chen Shi Jie, born in 1991, holds a Master of Engineering and has been studying Civil Engineering at Hohai University, Nanjing, China, since 2014. His research focuses on the acoustic emission characteristics and damage mechanism of fiber reinforced concrete under dynamic axial tension.

Zhou Li, born in 1992, holds a Master of Engineering and has been studying Civil Engineering at Hohai University, Nanjing, China, since 2015. Her research focuses on the damage characteristics of basalt fiber reinforced mortar under compression by acoustic emission characteristics.

Zhang Ting Ting, born in 1993, holds a Master of Engineering and has been studying Civil Engineering at Hohai University, Nanjing, China, since 2016. Her research focuses on the acoustic emission characteristics of mortar and concrete under dynamic axial tension.

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Published Online: 2017-07-10

Published in Print: 2017-07-14

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https://doi.org/10.3139/120.111048