氧化石墨烯/聚氨酯复配改性沥青混合料的性能和机理

将氧化石墨烯/聚氨酯纳米复合材料用于沥青改性,基于最大密度曲线级配理论,按照AC-13型沥青混合料级配设计了一种粗型密实结构的沥青混合料。通过弯曲实验和蠕变实验研究了沥青混合料的弯曲和蠕变变形行为。从沥青混合料的组织结构及破坏机理方面阐述了聚合物和纳米材料在沥青中的改性作用。结果表明,改性剂PU与GO改变了基质沥青的破坏性质,使得改性沥青混合料具有抵抗低温破坏的更加优良的力学性能; GO/PU复配改性沥青从"合金化"和"复合材料化"两个方面提高材料的性能。可见GO/PU复配改性剂的加入提高了沥青混合料路面的低温抗裂性能。

Properties and Mechanism of Graphene Oxide / Polyurethane Composite Modified Asphalt Mixture

In this paper, graphene oxide/polyurethane nanocomposites were used for asphalt modification. Based on the maximum density curve grading theory, a coarse dense asphalt mixture was designed according to the AC-13 asphalt mixture gradation. The bending and creep deformation behavior of asphalt mixture was studied by bending experiment and creep experiment. The modification of polymer and nanomaterials in asphalt was described from the aspects of the structure and failure mechanism of asphalt mixture. The results show that the modifiers PU and GO change the failure properties of the matrix asphalt, making the modified asphalt have better mechanical properties against low temperature damage; GO/PU compound modified asphalt from "alloying" and "composite materialization" two aspects improve the performance of the material. It can be seen that the addition of GO/PU compound modifier improves the low temperature crack resistance of asphalt and asphalt mixture pavement.