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Acoustic emission waveform characterization of crack origin and mode in fractured and ASR damaged concrete
Abstract Different constituents of concrete can have cracking behavior that varies in terms of the acoustic waveform that is generated. Understanding the waveform may provide insight into the source and behavior of a crack that occurs in a cementitious composite. In this study, passive acoustic emission (AE) was used to investigate the waveform properties of the individual components of concrete (i.e., aggregate, paste, and interfacial transition zone (ITZ)). First, acoustic events produced by cracks generated using mechanical loading in a wedge splitting test were detected. It was observed that cracks that occurred through the aggregate have an AE frequency range between 300kHz and 400kHz, while cracks that propagated through the matrix (paste and ITZ) have a frequency range between 100kHz and 300kHz. Second, tests were performed using samples that were susceptible to alkali silica reaction; and AE and X-ray computed tomography were used to detect cracking. AE events with a frequency range between 300kHz and 400kHz were detected at early ages, suggesting the initiation of cracks within reactive aggregate. At later ages, AE events were detected with frequency ranges of 100–300kHz, indicating crack development and propagation in the matrix.
Acoustic emission waveform characterization of crack origin and mode in fractured and ASR damaged concrete
Abstract Different constituents of concrete can have cracking behavior that varies in terms of the acoustic waveform that is generated. Understanding the waveform may provide insight into the source and behavior of a crack that occurs in a cementitious composite. In this study, passive acoustic emission (AE) was used to investigate the waveform properties of the individual components of concrete (i.e., aggregate, paste, and interfacial transition zone (ITZ)). First, acoustic events produced by cracks generated using mechanical loading in a wedge splitting test were detected. It was observed that cracks that occurred through the aggregate have an AE frequency range between 300kHz and 400kHz, while cracks that propagated through the matrix (paste and ITZ) have a frequency range between 100kHz and 300kHz. Second, tests were performed using samples that were susceptible to alkali silica reaction; and AE and X-ray computed tomography were used to detect cracking. AE events with a frequency range between 300kHz and 400kHz were detected at early ages, suggesting the initiation of cracks within reactive aggregate. At later ages, AE events were detected with frequency ranges of 100–300kHz, indicating crack development and propagation in the matrix.
Acoustic emission waveform characterization of crack origin and mode in fractured and ASR damaged concrete
Farnam, Yaghoob (author) / Geiker, Mette Rica (author) / Bentz, Dale (author) / Weiss, Jason (author)
Cement and Concrete Composites ; 60 ; 135-145
2015-04-09
11 pages
Article (Journal)
Electronic Resource
English
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