Acoustic Emission and Ultrasonic Characteristics in the Failure Process of Cemented Waste Concrete-Coal Gangue Backfilling (CWCGB) under Uniaxial Loading
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 aggrega...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2018-01-01
|
| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2018/8960806 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850179646801313792 |
|---|---|
| author | Guorui Feng Tingye Qi Xianjie Du Zehua Wang Yujiang Zhang |
| author_facet | Guorui Feng Tingye Qi Xianjie Du Zehua Wang Yujiang Zhang |
| author_sort | Guorui Feng |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-9b99ac5e28464e02b8fe8e1af0c3b764 |
| institution | OA Journals |
| issn | 1687-8086 1687-8094 |
| language | English |
| publishDate | 2018-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Civil Engineering |
| spelling | doaj-art-9b99ac5e28464e02b8fe8e1af0c3b7642025-08-20T02:18:27ZengWileyAdvances in Civil Engineering1687-80861687-80942018-01-01201810.1155/2018/89608068960806Acoustic Emission and Ultrasonic Characteristics in the Failure Process of Cemented Waste Concrete-Coal Gangue Backfilling (CWCGB) under Uniaxial LoadingGuorui Feng0Tingye Qi1Xianjie Du2Zehua Wang3Yujiang Zhang4College of Mining Engineering, Taiyuan University of Technology, Taiyuan, ChinaCollege of Mining Engineering, Taiyuan University of Technology, Taiyuan, ChinaCollege of Mining Engineering, Taiyuan University of Technology, Taiyuan, ChinaCollege of Mining Engineering, Taiyuan University of Technology, Taiyuan, ChinaCollege of Mining Engineering, Taiyuan University of Technology, Taiyuan, ChinaThe 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.http://dx.doi.org/10.1155/2018/8960806 |
| spellingShingle | Guorui Feng Tingye Qi Xianjie Du Zehua Wang Yujiang Zhang Acoustic Emission and Ultrasonic Characteristics in the Failure Process of Cemented Waste Concrete-Coal Gangue Backfilling (CWCGB) under Uniaxial Loading Advances in Civil Engineering |
| title | Acoustic Emission and Ultrasonic Characteristics in the Failure Process of Cemented Waste Concrete-Coal Gangue Backfilling (CWCGB) under Uniaxial Loading |
| title_full | Acoustic Emission and Ultrasonic Characteristics in the Failure Process of Cemented Waste Concrete-Coal Gangue Backfilling (CWCGB) under Uniaxial Loading |
| title_fullStr | Acoustic Emission and Ultrasonic Characteristics in the Failure Process of Cemented Waste Concrete-Coal Gangue Backfilling (CWCGB) under Uniaxial Loading |
| title_full_unstemmed | Acoustic Emission and Ultrasonic Characteristics in the Failure Process of Cemented Waste Concrete-Coal Gangue Backfilling (CWCGB) under Uniaxial Loading |
| title_short | Acoustic Emission and Ultrasonic Characteristics in the Failure Process of Cemented Waste Concrete-Coal Gangue Backfilling (CWCGB) under Uniaxial Loading |
| title_sort | acoustic emission and ultrasonic characteristics in the failure process of cemented waste concrete coal gangue backfilling cwcgb under uniaxial loading |
| url | http://dx.doi.org/10.1155/2018/8960806 |
| work_keys_str_mv | AT guoruifeng acousticemissionandultrasoniccharacteristicsinthefailureprocessofcementedwasteconcretecoalganguebackfillingcwcgbunderuniaxialloading AT tingyeqi acousticemissionandultrasoniccharacteristicsinthefailureprocessofcementedwasteconcretecoalganguebackfillingcwcgbunderuniaxialloading AT xianjiedu acousticemissionandultrasoniccharacteristicsinthefailureprocessofcementedwasteconcretecoalganguebackfillingcwcgbunderuniaxialloading AT zehuawang acousticemissionandultrasoniccharacteristicsinthefailureprocessofcementedwasteconcretecoalganguebackfillingcwcgbunderuniaxialloading AT yujiangzhang acousticemissionandultrasoniccharacteristicsinthefailureprocessofcementedwasteconcretecoalganguebackfillingcwcgbunderuniaxialloading |