A study of dynamic compression behavior of carbon nanotubes reinforced concrete based on SHPB test

XIA Wei; LU Song; BAI Erlei; ZHAO Dehui; XU Jinyu; DU Yuhang

doi:10.11883/bzycj-2023-0424

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XIA Wei, LU Song, BAI Erlei, ZHAO Dehui, XU Jinyu, DU Yuhang. A study of dynamic compression behavior of carbon nanotubes reinforced concrete based on SHPB test[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2023-0424

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XIA Wei, LU Song, BAI Erlei, ZHAO Dehui, XU Jinyu, DU Yuhang. A study of dynamic compression behavior of carbon nanotubes reinforced concrete based on SHPB test[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2023-0424

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A study of dynamic compression behavior of carbon nanotubes reinforced concrete based on SHPB test

doi: 10.11883/bzycj-2023-0424

XIA Wei^1
,,
LU Song^{1
,
,},
BAI Erlei¹,
ZHAO Dehui¹,
XU Jinyu^{1, 2},
DU Yuhang³

1.
Aviation Engineering School, Air Force Engineering University, Xi’an 710038, Shaanxi, China
2.
College of Mechanics and Civil Architecture, Northwest Polytechnic University, Xi’an 710072, Shaanxi, China
3.
China Northwest Architectural Design and Research Institute Co., Ltd., Xi’an 710018, Shaanxi, China

Received Date: 2023-11-27
Rev Recd Date: 2024-01-25

Available Online: 2024-02-29

Abstract

Abstract

In order to investigate the dynamic compression behavior of carbon nanotubes reinforced concrete under impact loading, the impact compression tests were carried out by using a split Hopkinson pressure bar (SHPB) test device with a diameter of 100 mm. The impact velocities in the SHPB tests were about 6.8, 7.8, 8.8, 9.8 and 10.8 m/s, respectively. The contents of carbon nanotubes in concrete (as a percentage of cement mass) were 0% (i.e. ordinary concrete, as a baseline of comparison), 0.10%, 0.20%, 0.30% and 0.40%, respectively. Then, based on the test results, the evolution laws of dynamic compressive strength, compression deformation, and energy dissipation characteristics of concrete under different impact velocities and carbon nanotubes contents were compared and analyzed. The experimental results show that the dynamic strength characteristics of carbon nanotubes reinforced concrete have significant loading rate sensitivity. The dynamic compressive strength and dynamic enhancement factor show linear positive correlations with impact velocity. When the loading level remains the same, the dynamic compressive strength increases first and then decreases slightly with the increase of carbon nanotubes content, and the growth rate can reach 23.7% compared to ordinary concrete. The variation characteristics of ultimate strain and impact toughness of carbon nanotubes reinforced concrete are similar, which gradually increase with the increase of impact velocity, and have a certain impact velocity strengthening effect, but there is no obvious linear relationship with the impact velocity. Toughness is a comprehensive reflection of material strength and deformation. Therefore, at the same loading level, when the content of carbon nanotubes was 0.30%, the impact toughness of concrete achieved a relative maximum, being about 10% higher than that of ordinary concrete. The appropriate addition of carbon nanotubes can effectively enhance the integrity and compactness of the internal structure of concrete, thereby improving its dynamic mechanical properties and energy dissipation performance.
- concrete,
- carbon nanotubes,
- split Hopkinson pressure bar (SHPB),
- dynamic mechanical properties,
- impact energy dissipation

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References(25)

References

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