Effect of Low Temperature Plasma Modified-carbon Nanotubes on Performance of Recycled Asphalt
SONG Guolin1, ZHANG Ze2, SHEN Chengzhu1, FAN Xin2, XIE Junwei1, TANG Guoyi1
1 Tsinghua Shenzhen International Graduate School,Shenzhen 518055,China 2 College of Materials Science and Engineering,Shenzhen University,Shenzhen 518060,China
Abstract: Low temperature plasma was used to modify multi-walled carbon nanotubes (MWNTs), and the recycling agent composed with such plasma-modified-MWNTs was prepared and introduced into the aged asphalts for their juvenescence. The chemical composition of low temperature plasma modified-MWNTs and its dispersibility and compatibility with asphalt matrix was characterized by using XPS and SEM, while the modification mechanism of low temperature plasma modified-MWNTs was also discussed. FTIR and TG were employed to exam the components, thermal stabilities and aging resistances of recycled asphalts. Finally, the effects of regeneration and performances of recycled asphalts were evaluated via the penetration, softening point and ductility indexes tests. The results indicate that low temperature plasma treatment could solve the interface problem of MWNTs while introduce a large number of oxygen-containing functional groups on the surface, which improves the dispersion of MWNTs and the binding between MWNTs and asphalt matrix. Therefore, the mechanical properties of recycled asphalt are greatly improved. At the same time, MWNTs can absorb part of the oil in the recycling agent and play a sustained-release role, which better overcomes the problem that asphalt ages at a high rate due to the rapid loss of oil within the traditional recycling agent. Therefore, it can effectively improve the anti-aging performance while improving the comprehensive performance of recycled asphalt.
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2020, Vol. 34 
