Dynamic Compressive Mechanical Properties of Carbon Nanofibers Reinforced Concrete under Impact Loading
XIA Wei1, XU Jinyu1,2, NIE Liangxue1, WANG Zhihang1, HUANG Zhe1, YAO Ao1
1 School of Aeronautical Engineering, Air Force Engineering University, Xi'an 710038, China 2 College of Mechanics and Civil Architecture, Northwest Polytechnic University, Xi'an 710072, China
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.
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2021, Vol. 35 
