摘要
高模量沥青混合料具有优异的高温和抗疲劳性能,但低温性能有待提升。为此,采用聚酯纤维与玄武岩纤维对高模量沥青混合料的路用性能进行提升。通过单掺和复掺2种方式,制备不同纤维含量的沥青混合料,利用车辙试验、低温弯曲试验和半圆疲劳试验对其路用性能进行分析,并通过沥青胶浆的多应力重复蠕变恢复试验、弯曲梁流变试验和低温小梁断面的扫描电子显微镜微观表征揭示纤维在沥青胶浆中的作用机理。研究结果表明:复掺纤维可以显著提升高模量沥青混合料的动稳定度、低温破坏应变与疲劳寿命,在玄武岩纤维与聚酯纤维质量比为1:2的条件下,高模量沥青混合料的动稳定度、低温破坏应变和疲劳寿命(应力比为0.4时)分别提高61.7%、49.2%和200.0%,高模量沥青胶浆的不可恢复蠕变柔量(应力为3.2 kPa时)降低63.0%,蠕变速率(-12℃时)提高9.0%。复掺纤维的方式可以充分发挥玄武岩纤维刚性与聚酯纤维柔性的特点,牢固的纤维网络能够有效传递并分散沥青混合料的内部应力。因此,推荐采用复掺玄武岩纤维和聚酯纤维优化高模量沥青混合料的性能。
High modulus asphalt mixture has excellent high-temperature performance and fatigue resistance performance,but the low-temperature performance needs to be enhanced.For this reason,polyester fiber and basalt fiber were used to improve the performance of high modulus asphalt mixture.Asphalt mixtures with different fiber contents were prepared by single blending and compound blending,and the road performance was analysed by using wheel tracking test,low-temperature bending test and semi-circular fatigue test,the mechanism of fiber action in asphalt mastic was also revealed by multiple stress creep recovery test,bending beam rheometer test and scanning electron microscope microscopic characterization of low-temperature trabecular section.The results show that the compounding of fiber can significantly improve the dynamic stability,low-temperature failure strain and fatigue life of high modulus asphalt mixture.Under the condition that the mass ratio of basalt fiber to polyester fiber is 1꞉2,the dynamic stability,low-temperature failure strain,and fatigue life(stress ratio of 0.4)of high modulus asphalt mixture are increased by 61.7%,49.2%,and 200.0%,respectively,the non-recoverable creep compliance(3.2 kPa)of high modulus asphalt mastic is reduced by 63.0%,and its creep rate(-12℃)is increased by 9.0%.Compounding of fiber can give full play to the basalt fiber rigidity and polyester fiber flexibility,strong fiber network can effectively transmit and disperse the asphalt mixture of the internal stress.Therefore,it is recommended to use compounding of basalt fiber and polyester fiber for the performance optimization of the high modulus asphalt mixture.
作者
杜银飞
徐君全
王志杰
马聪
邓海斌
DU Yinfei;XU Junquan;WANG Zhijie;MA Cong;DENG Haibin(School of Civil Engineering,Central South University,Changsha 410075,China;Institute of Urban Smart Transportation&Safety Maintenance,Shenzhen University,Shenzhen 518060,China;Highway and Transportation Administration Center of Huzhou,Huzhou 313000,China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2024年第10期3898-3908,共11页
Journal of Central South University:Science and Technology
基金
国家重点研发计划项目(2021YFB2601000)
国家自然科学基金资助项目(51808562)
湖南省自然科学基金资助项目(2020JJ5723)。
关键词
道路工程
高模量沥青混合料
路用性能
微观机理
聚酯纤维
玄武岩纤维
road engineering
high modulus asphalt mixture
road performance
micro-mechanisms
polyester fiber
basalt fiber
