关键词: 中空聚酯纤维;沥青胶浆;沥青混合料;导热系数;微观形貌

Abstract: To study the functional mechanism of bitumen mastics with hollow polyester fibers,this paper mainly study on the properties of different types of hollow polyester fibers modified asphalt mortar which including shear performance,crack resistance,high temperature rheological properties,the thermal physical properties and the microscopic mechanism.The road performance and toughening mechanism of hollow polyester asphalt mixture were analyzed.It is show that the adsorption properties with asphalt of three-dimensional structure of the hollow fiber is better than two-dimensional structure,when the dimension of hollow fiber is 15D and the dosage is 2％,shear strength and rheological property of bitumen mastics can be improved by adding hollow polyester fiber,the performance of shear strength is increased by 4.19 times and the rheological property is improved significantly than original bitumen mastics.Hollow polyester fiber with hollow cavity structure which make the coefficient of thermal conductivity of original bitumen mastics is reduced by 15％.The residual stability,tensile strength ratio,dynamic stability and the maximum bending strain of hollow polyester fiber asphalt mixture increase by 3.1％,5.0％,36.8％ and 29.0％.Bitumen and hollow polyester fiber forming network structure which make a contribution to the performance of crack resistance and high temperature stability of bituminous mixture.

Key words: hollow polyester fiber;bitumen mastics;bitumen mixture;thermal conductivity;micro morphology