复合纤维组成优化及其混合料性能评价

为了对复合纤维组成进行优化,按正交设计方案复配木质素纤维、聚酯纤维、玄武岩纤维组成9种复合纤维,并对各复合纤维改性沥青进行直剪试验,以抗剪强度为指标,通过极差、方差分析了各单纤维的影响作用,进而优选了复合纤维的最佳掺量及各组分最佳掺配比例;同时,通过室内试验比较验证了单纤维沥青混合料与复合纤维沥青混合料的路用性能.结果表明:复合纤维掺量为0.3%,木质素纤维、聚酯纤维、玄武岩纤维掺配比例为1:2:2时,复合纤维改性沥青具有最优的抗剪性能;复合纤维改性兼具各单纤维改性的优势,其混合料路用性能更加均衡,且具有良好的经济性,为路面材料改性技术提供了一种新的选择.

Mix Design and Performance Assessment of Asphalt Concretes With Hybrid Fibers

In order to optimize the composition of the hybrid fiber,nine kinds of hybrid fibers which consisted of different proportions of lignin fiber,polyester fiber and basalt fiber were prepared according to orthogonal design method.Then the shear strength of different composite fibers modified asphalt were measured by the direct shear test and the optimum dosage and proportion of the hybrid fibers were determined through range analysis and variance analysis.At the same time the pavement performance of hybrid fiber asphalt mixture and single fiber asphalt mixture were tested and compared in laboratory.Resultsshow that the optimum dosage of hybrid fiber is 0.3%and the optimum proportion of lignin fiber,polyester fiber and basalt fiber is 1:2:2.The hybrid fiber can give full play the advantages of different single fibers so that it has a more balanced performance and has a better economy.The hybrid fiber suggested in this paper provides a new choice for the technology of pavement material modification.