冲击荷载下纳米碳纤维混凝土的动态受压力学特性

doi:10.11896/cldb.20100229

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Abstract For the purpose of delving deep into the dynamic compressive mechanical properties of carbon nanofibers reinforced concrete, the plain concrete and concrete with four different fiber volume fractions (0.1%、0.2%、0.3%、0.5%) were developed, and the impact compression tests were conducted with Φ100 mm split Hopkinson pressure bar. The variation characteristics of dynamic compressive strength, dynamic compression deformation, impact toughness and dynamic elastic modulus of concrete under five different strain rates were compared and analyzed. The results show that the addition of carbon nanofibers can enhance the dynamic compressive strength, dynamic compression deformation and impact toughness of concrete, and when the content of carbon nanofibers is 0.3%, the best dynamic compressive strength is obtained. However, only when the content of carbon nanofibers is 0.2%, the dynamic elastic modulus of concrete is improved. The dynamic compressive strength, impact toughness and dynamic elastic modulus of plain concrete and carbon nanofibers reinforced concrete increase with the increase of strain rate, and show a significant linear relationship. Although the dynamic peak strain and ultimate strain increase with the increase of strain rate, there is no obvious linear correlation between them. Appropriate content of carbon nanofibers can play the role of reinforcement, crack resistance and small size effect, so as to improve the dynamic compressive mechanical properties of concrete under impact loading effectively.

Key words： carbon nanofibers modified concrete impact loading dynamic compressive properties strain rate effect

Published: 25 November 2021 Online: 2021-12-13

CLC number:

TU528.572

Fund:National Natural Science Foundation of China (51208507, 51378497).

About author: Wei Xiais a master in School of Aeronautical Engineering, Air Force Engineering University and his research field is related to building materials and new materials for protection engineering.
Jinyu Xuis a professor and doctoral supervisor in Air Force Engineering University,also a part-time professor and doctoral supervisor in College of Mechanics and Civil Architecture, Northwest Polytechnic University. His research interests mainly include structural engineering and protection engineering.

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	XIA Wei
	XU Jinyu
	NIE Liangxue
	WANG Zhihang
	HUANG Zhe
	YAO Ao

Cite this article:

XIA Wei,XU Jinyu,NIE Liangxue, et al. Dynamic Compressive Mechanical Properties of Carbon Nanofibers Reinforced Concrete under Impact Loading[J]. Materials Reports, 2021, 35(22): 22063-22071.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.20100229 OR http://www.mater-rep.com/EN/Y2021/V35/I22/22063

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