石墨烯-玄武岩纤维沥青混合料路用性能影响因素分析

Analysis of factors influencing road performance of graphene-basalt fiber asphalt mixtures

  • 摘要: 石墨烯-玄武岩纤维沥青混合料(GBFAM)是一种新型复合改性材料。为探讨其路用性能演化特征及影响因素,在混合料配合比设计的基础上,通过车辙试验、低温小梁弯曲试验和冻融劈裂试验,利用响应曲面法分析石墨烯掺量、玄武岩纤维掺量和油石比对动稳定度、最大弯拉应变和冻融劈裂强度比的影响及显著性水平。结果表明:在以最佳石墨烯掺量0.20 %、最佳玄武岩纤维掺量0.30 % 和最佳油石比5.32 % 为基准的一定变化幅度范围内,GBFAM的动稳定度、最大弯拉应变和冻融劈裂强度比随着石墨烯掺量、玄武岩纤维掺量和油石比的增加均呈现先增大后减小的变化趋势,并大致在最佳配比附近达到最大值,其中油石比对动稳定度、最大弯拉应变和冻融劈裂强度比的影响非常显著,石墨烯和油石比之间的交互作用对最大弯拉应变影响显著,其余各因素及交互作用的影响均不显著。

     

    Abstract: The graphene-basalt fiber asphalt mixtures(GBFAM) is a new composite modified material. In order to explore its road performance evolution characteristics and its influencing factors, on the basis of mixing ratio design, through wheel tracking, low-temperature bending beam, freeze-thaw splitting tests and the use of the response surface methodology, the influences of graphene content, basalt fiber content, and asphalt aggregate ratio on the dynamic stability, maximum bending strain, and freeze-thaw tensile strength ratio were analyzed, along with their significance levels. The results demonstrate that within a certain range of variation based on the optimum graphene content of 0.20 %, optimum basalt fiber content of 0.30 % and optimum asphalt aggregate ratio of 5.32 %, the dynamic stability, maximum bending strain, and freeze-thaw tensile strength ratio of the graphene-basalt fiber asphalt mixture tends to increase and then decrease with increasing graphene content, basalt fiber content, and asphalt aggregate ratio, reaching a maximum value near the optimum asphalt aggregate ratio, as well as the optimum graphene and basalt fiber contents. Among them, the asphalt aggregate ratio has a very significant influence on the dynamic stability, maximum bending strain, and freeze-thaw tensile strength ratio. The interaction between graphene and asphalt aggregate ratio has a significant influence on the maximum bending strain, and the effects of the remaining factors and their interactions are not significant.

     

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