A study on fracture fractal of high temperature spray cooled carbon nanotube concrete under impact load

TIAN Wei,GAO Fangfang

Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (4) : 70-80.

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (4) : 70-80.

A study on fracture fractal of high temperature spray cooled carbon nanotube concrete under impact load

  • TIAN Wei,GAO Fangfang
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Abstract

In order to improve the impact resistance of concrete after high temperature, multi walled carbon nanotubes (MWCNTs) with high strength, high toughness and good thermal conductivity are added into the concrete. And the fractal characteristics and energy consumption characteristics of carbon nanotube reinforced concrete under impact loading after high temperature are explored by the fractal index (i.e. fractal dimension), and the relationship between fractal dimension and dynamic compressive strength, energy consumption and impact toughness is established. The results show that after high temperature, the fractal dimension of concrete impact fracture increases with the increase of strain rate and temperature under impact load. At the constant temperature, the dynamic compressive strength, energy consumption and impact toughness of concrete increase with the increase of fractal dimension, while at the constant impact pressure, the they perform the opposite trend. Meanwhile, compared with ordinary plain concrete, concrete incorporating with multi walled carbon nanotubes owns light crushing degree, small fractal dimension, high energy consumption, impact toughness and dynamic compressive strength. In fact, the variation of fractal dimension essentially depends on the compactness of concrete and the propagation degree of internal crack. Well dispersed multi walled carbon nanotubes in concrete could not only refine pores, but also provide attachment points for hydration products and promote hydration process, so as to improve the compactness of concrete matrix. Besides, the bridging, pullout and thermal conductivity of multi walled carbon nanotube are also conducive to inhibit and delay the initiation and propagation of temperature cracks and load cracks. Consequently, the resistance of concrete with multi walled carbon nanotubes to high temperature and impact load has been effectively improved.

Key words

Concrete / Multi walled carbon nanotubes / High temperature spray / Impact load / Fractal dimension

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TIAN Wei,GAO Fangfang. A study on fracture fractal of high temperature spray cooled carbon nanotube concrete under impact load[J]. Journal of Vibration and Shock, 2023, 42(4): 70-80

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