1 School of Civil and Architectural Engineering, Guilin University of Technology, Guilin 541004, Guangxi, China 2 Guangxi Key Laboratory of Geotechnical Mechanics and Engineering, Guilin 541004, Guangxi, China
Abstract: The effect of carbon nanotubes on the low-temperature performance of asphalt mixtures with different amounts of carbon nanotube modified asphalt mixture was studied by cleavage test and trabecular shear fatigue test. And the finite element model of carbon nanotube modified asphalt mixture pavement was established by Abaqus to analyze the crack extension behavior in terms of stress intensity factor, crack energy release rate, crack tip displacement, etc. The results show that: (1) the addition of carbon nanotubes improves the low-temperature crack resis-tance of asphalt mixtures, particularly its early crack resistance. (2) The addition of carbon nanotubes reduces the expansion rate of tensile (type Ⅰ) cracks and promotes the expansion of shear type (Ⅱ) cracks, but the shear force generated by type Ⅱ cracks is much less than the tensile crack strength of carbon nanotubes, which is not enough to make the cracks continue to expand. Overall, the addition of carbon nanotubes can effectively inhibit the expansion of cracks on asphalt pavement. (3) The higher the amount of carbon nanotube doping, the greater the fracture release energy. The carbon nanotube can weaken or absorb the external energy of the asphalt mixture to a certain extent, play a role in dissipating energy, limit the expansion of the fracture tip displacement, and make the asphalt mixture have better low-temperature crack resistance.
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2023, Vol. 37 
