石墨烯改性沥青高温性能研究

Study on high temperature performance of graphene modified asphalt

采用石墨烯对基质沥青进行改性,测试不同石墨烯掺量改性沥青的高温性能,通过扫描电镜分析石墨烯在沥青中的分散状况。试验结果表明:石墨烯可以提高改性沥青的PG高温等级,随着石墨烯掺量的增加,改性沥青的针入度减小,软化点和动力黏度则增大。当石墨烯掺量超过3%后,高温条件下改性沥青的复数剪切模量增幅有限;当掺量超过4%后,黏度过大导致试件无法成型。综合考虑成本和路用性能,建议石墨烯掺量为2%。

The matrix asphalt was modified with graphene,and the high temperature properties of the modified asphalt with different contents of graphene were analyzed.The dispersion of graphene in the asphalt was analyzed by scanning electron microscopy.The experimental results show that graphene can improve the PG grade of modified asphalt,and the penetration of modified asphalt decreases with the increase of graphene content,while the softening point and dynamic viscosity increase.When the content of graphene exceeds 3%,the increase of complex shear modulus of modified asphalt at high temperature is limited when the dosage of graphene exceeds 3%.When the dosage exceeds 4%,the specimen cannot be formed due to excessive viscosity.Considering cost and road performance,it is recommended that the dosage of graphene should be 2%.