Mechanical and Acoustic Emission Behavior of Gangue Concrete under Uniaxial Compression
Abstract
:1. Introduction
2. Experimental Materials and Methods
2.1. Materials
2.2. Mix Proportion
2.3. Methods
2.3.1. AE System
2.3.2. Loading Machine
2.3.3. Uniaxial Compressive Test with AE Monitoring
3. Physical and Mechanical Properties of Coal Gangue
3.1. Physical Properties of Coal Gangue
3.2. Compressive Strength
4. Result and Discussion
4.1. Mechanics Property of Gangue Concrete
4.2. Characteristic Parameters of AE
5. Conclusions
- The mechanical properties of coal gangue are lower than gravel. This is due to the lithology, higher porosity, and microcracks of the coal gangue.
- The mechanical test result shows that the maximum bearing strength of gangue concrete can reach 35–40 MPa.
- Comparing with ordinary concrete, the AE signals of gangue concrete in the linear elastic stage is inactive. It is due to the mortar with angular gangue particles can not easily rotate, thus fewer microcracks appear and develop. The greater growth in AE signal strength is observed near the peak load as a result of the lower value of accumulative hits in the linear elastic stage.
- In the Acoustic Emission (AE) test, the accumulative energy of gangue concrete has two jumps before the peak load, while ordinary concrete has one. The first jump of the accumulative energy of gangue concrete is caused by the rupture of gangue aggregates. Therefore, this difference can be used to forecast damage to the gangue concrete structure.
Author Contributions
Funding
Conflicts of Interest
References
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Grading Type | W/C (%) | s/a (%) | Weight Per Unit Volume (kg/m3) | |||
---|---|---|---|---|---|---|
CG/G | S | C | W | |||
Gangue concrete | 45 | 25 | 1255 | 418 | 418 | 188 |
Ordinary concrete | 45 | 42 | 1242 | 558 | 373 | 168 |
Mineral Composition | Q | K | I | I/S | S | Cl | F | D | C | L | P | Coal |
---|---|---|---|---|---|---|---|---|---|---|---|---|
Gangue | 20 | 33 | 10 | 11 | 2 | 2 | 0.5 | 0.5 | 0.5 | 1.3 | 2.6 | 15 |
Chemical Component | Na2O | MgO | Al2O3 | SiO2 | K2O | CaO | Fe2O3 | P | S |
---|---|---|---|---|---|---|---|---|---|
Gangue | 0.41 | 1.4 | 20.7 | 53.7 | 2.0 | 1.3 | 6.7 | 0.05 | 1.53 |
Chemical component | F | Ba | Mn | Cu | Pb | Zn | Ti | Cl | |
Gangue | <0.045 | ≤0.002 | 0.043 | 0.0005 | <0.0002 | 0.005 | 0.42 | 0.009 |
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Xiao, M.; Ju, F.; Ning, P.; Li, K. Mechanical and Acoustic Emission Behavior of Gangue Concrete under Uniaxial Compression. Materials 2019, 12, 3318. https://doi.org/10.3390/ma12203318
Xiao M, Ju F, Ning P, Li K. Mechanical and Acoustic Emission Behavior of Gangue Concrete under Uniaxial Compression. Materials. 2019; 12(20):3318. https://doi.org/10.3390/ma12203318
Chicago/Turabian StyleXiao, Meng, Feng Ju, Pai Ning, and Kaiyuan Li. 2019. "Mechanical and Acoustic Emission Behavior of Gangue Concrete under Uniaxial Compression" Materials 12, no. 20: 3318. https://doi.org/10.3390/ma12203318