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Acoustic Emission and Ultrasonic Characteristics in the Failure Process of Cemented Waste Concrete-Coal Gangue Backfilling (CWCGB) under Uniaxial Loading
Joint Authors
Qi, Tingye
Feng, Guorui
Zhang, Yujiang
Du, Xianjie
Wang, Zehua
Source
Issue
Vol. 2018, Issue 2018 (31 Dec. 2018), pp.1-12, 12 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2018-12-11
Country of Publication
Egypt
No. of Pages
12
Main Subjects
Abstract EN
The acoustic emission (AE) characteristics, change law of the ultrasonic velocity, and internal failure mode of cemented waste concrete-coal gangue backfilling (CWCGB) with 600 days of curing time were studied under uniaxial loading conditions.
Waste concrete particles of 5 mm acting as fine aggregates substituted for 30% and 50% fine coal gangue in the cemented coal gangue backfilling (CGB).
AE was used to test the ring count and changing rule of the accumulated energy, locate the event for positioning, and calculate the number of events.
The average ultrasonic wave velocity was measured via an ultrasonic detector.
The characteristics of the microfractures were observed via a scanning electron microscope.
The results showed that the specimens with 30% and 50% waste concrete replacement rates underwent ultrasonic wave velocity stabilization and a rapid decline stage under uniaxial compression; for the former case, the decline started earlier.
The AE ring count attained peaks at the pore compression stage, yield stress point, stress peak value, and residual stress stage with no added waste concrete and 30% and 50% waste concrete substitution rates.
The value and consequent frequency of the ringing count peak and cumulative energy slope increased with increasing waste concrete substitution rate.
A microcrack was observed at the interfacial transition zone between the cement paste and gangue owing to the alkali-aggregate reaction effect.
However, a better bonding performance was exhibited by the waste concrete particles and paste.
American Psychological Association (APA)
Feng, Guorui& Qi, Tingye& Du, Xianjie& Wang, Zehua& Zhang, Yujiang. 2018. Acoustic Emission and Ultrasonic Characteristics in the Failure Process of Cemented Waste Concrete-Coal Gangue Backfilling (CWCGB) under Uniaxial Loading. Advances in Civil Engineering،Vol. 2018, no. 2018, pp.1-12.
https://search.emarefa.net/detail/BIM-1116812
Modern Language Association (MLA)
Feng, Guorui…[et al.]. Acoustic Emission and Ultrasonic Characteristics in the Failure Process of Cemented Waste Concrete-Coal Gangue Backfilling (CWCGB) under Uniaxial Loading. Advances in Civil Engineering No. 2018 (2018), pp.1-12.
https://search.emarefa.net/detail/BIM-1116812
American Medical Association (AMA)
Feng, Guorui& Qi, Tingye& Du, Xianjie& Wang, Zehua& Zhang, Yujiang. Acoustic Emission and Ultrasonic Characteristics in the Failure Process of Cemented Waste Concrete-Coal Gangue Backfilling (CWCGB) under Uniaxial Loading. Advances in Civil Engineering. 2018. Vol. 2018, no. 2018, pp.1-12.
https://search.emarefa.net/detail/BIM-1116812
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1116812