Analysis of Aging Characteristics of Expressway Asphalt Mixture
In order to study the aging characteristics of expressway SMA modified asphalt mixture,taking an expressway project as an example,combined with environmental conditions and highway construction requirements,rubber powder/SMA composite modified asphalt was selected as asphalt material,combined with high-quality limestone minerals,rubber powder and surfactants,etc.,to prepare skeleton compact AC-20 specimen samples.The high temperature performance,dynamic modulus and fatigue life were tested.The results show that the dynamic stability of the specimens is above 5 525 times/mm at different temperatures,and the dynamic modulus of the specimens is above 4 500 MPa and 1 500 MPa at 20℃and 40℃respectively.The fatigue life of the specimens is more than 3 856 000 times,which meets the technical application standard.
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