Behaviour of Foam Concrete under Impact Loading Based on SHPB Experiments

This paper presents an innovative method for using foam concrete as a typical building material for soft structures in underground coal mines subjected to dynamic loading. To understand the behaviour of foam concrete under impact loading, a total of 30 specimens with a diameter of 50 mm and a height...

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Bibliographic Details
Published in:Shock and vibration 2019-01, Vol.2019 (2019), p.1-13
Main Authors: Zhao, Yi-Chao, Zhao, Hongchao, Gao, Ming-Shi, He, Yong-Liang
Format: Article
Language:English
Subjects:
Abandoned mines
Cement
Civil engineering
Coal industry
Coal mines
Coal mining
Compressive strength
Concrete
Concrete construction
Concrete mixing
Concrete research
Construction
Construction materials
Density
Drinking water
Dynamic loads
Energy absorption
Fly ash
Impact loads
Impact tests
Impact velocity
Mechanical properties
Mineral industry
Mining industry
Roads & highways
Split Hopkinson pressure bars
Strain rate
Stress-strain curves
Stress-strain relationships
Studies
Underground mines
Underground structures
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Summary:This paper presents an innovative method for using foam concrete as a typical building material for soft structures in underground coal mines subjected to dynamic loading. To understand the behaviour of foam concrete under impact loading, a total of 30 specimens with a diameter of 50 mm and a height of 50 mm were experimentally tested using a 75 mm diameter split Hopkinson pressure bar (SHPB) device. The key parameters investigated in the present study included the type of foam concrete (fly ash and sand), the density of foam concrete (1000, 1200 and 1400 kg/m3), and the impact velocity (3.0, 4.0, 5.0, 6.0, and 7.0 m/s). Six specimens were also tested under static loading for comparison. The stress-strain curve of foam concrete under impact loading showed three stages, started with a linear elastic stage, followed by a yield stage and ended with a pore wall destruction stage. The test results also indicated that the dynamic increase factor, ultimate compressive strength, tenacity, and specific energy absorption increase with the strain rate under the same density. In particular, both the failure model and the behaviour of foam concrete were affected by the impact velocity. The findings of this research provide a reference for further research on the application of foam concrete in underground coal mines.
ISSN:1070-9622
1875-9203
DOI:10.1155/2019/2065845