借助控制变量法研究工艺参数对复合改性沥青性能的影响,以确定复合改性沥青的最佳制备工艺。而后,研究了石墨烯对苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)改性沥青物理性能、贮存稳定性、低温性能、抗老化性能及流变性能的影响。利用荧光显微镜对石墨烯/SBS复合改性沥青改性机理进行分析。结果表明:石墨烯/SBS复合改性沥青的最佳制备工艺为:剪切速率4000r/min、剪切温度180℃、剪切时间70min。石墨烯的掺入显著地改善了SBS改性沥青的高温性能、抗老化性能及贮存稳定性,但对低温性能略有不利影响;石墨烯/SBS复合改性沥青中石墨烯的最佳掺量为0.06%;石墨烯插入SBS网状结构之间,并与SBS小分子相互缠结,产生稳定的物理交联,使高温下沥青分子链段活动性受阻,从而改善沥青性能。
To determine the best preparation process,the impact of process parameters on the performance of graphene/styrene butadiene styrene block copolymer(RGO/SBS) composite modified asphalt was adopted by the control variable method.Then the high temperature and low temperature property,storage stability,anti-aging property,rheological property and modification mechanism of the asphalt were analyzed.It was found that the shear time caused a great impact on the properties of the asphalt.The optimal modification process of the RGO/SBS asphalt was the shear rate of 4000r/min,the shear temperature of 180℃,and the shear time of 70min.The addition of RGO significantly improved the high temperature performance,anti-aging performance and storage stability of SBS asphalt,but the low temperature performance deteriorated slightly.The optimum RGO content of RGO/SBS asphalt was 0.06%.RGO was inserted between the SBS network structure and entangled with SBS small molecules to produce stable physical crosslinking,inhibiting the activity of asphalt molecular chain at high temperature to improve asphalt performance.
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基金资助
国家自然科学基金(51608046);青海省交通科技项目(JG-GM-2021-1)
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