石墨烯/层状双金属氢氧化物(LDHs)对SBS改性沥青物理和老化性能的影响

Response of Graphene/LDHs on Physical and Aging Properties of SBS Modified Bitumen

研究石墨烯、层状双金属氢氧化物(LDHs)及石墨烯复配LDHs对SBS改性沥青物理性能和抗热氧老化、紫外光氧老化性能的影响,并采用傅立叶变换红外光谱(FTIR)分析了改性沥青老化前后化学结构的变化。结果表明,石墨烯、LDHs及石墨烯复配LDHs均能提高SBS改性沥青的高温性能和抗老化性能。与单掺石墨烯和LDHs相比,石墨烯复配LDHs能同时减少SBS改性沥青热氧老化和紫外光氧老化前后软化点和粘度的变化,提高其延度和针入度保留率。FTIR分析显示,掺入石墨烯复配LDHs的SBS改性沥青老化前后羰基指数变化率和碳碳双键指数变化率均最小,表明石墨烯复配LDHs对SBS改性沥青耐老化性能具有更好的改善效果。

The effects of graphene,layered bimetallic hydroxides(LDHs)and graphene compounded LDHs on the physical properties,thermal oxygen aging resistance and ultraviolet oxygen aging resistance of SBS modified asphalt were studied,and the change of chemical structure of the modified asphalts before and after aging was analyzed by Fourier transform infrared spectroscopy(FTIR).The results showed that the high-temperature and anti-aging properties of SBS modified asphalt could be improved by adding graphene,LDHs and graphene compounded LDHs.Compared with graphene and LDHs,graphene compounded LDHs could simultaneously reduce the changes of softening point and viscosity of SBS modified asphalt before and after thermal-oxidative and ultraviolet-oxidative aging,and increase the ductility and penetration retention.FTIR analysis showed that the carbonyl index change rate and carbon-carbon double bonds index change rate of SBS modified asphalt mixed with graphene compounded LDHs were the smallest before and after aging,indicating that graphene compounded LDHs had a better effect on improving the aging resistance of SBS modified asphalt.