Research on Low Temperature Performance and Adhesion Characteristics of High Viscosity Modified Asphalt
The low-temperature behavior and adhesion of high viscosity asphalt(HVA)are critical properties to ensure the serviceability of the porous asphalt pavement.To accurately characterize the low-temperature performance and adhesion of HVA,the low temperature relaxation and viscoelastic characteristics of HVA are firstly assessed by comparing the stiffness modulus,m-value,and comprehensive flexibility parameter Jc.The adhesion properties and water stability of high-viscosity asphalt-aggregate system are evaluated by conducting the contact angle tests regarding high-viscosity asphalt and aggregate,which is based on Surface Free Energy(SFE)theory,with employing indicators such as adhesive work,peeling work and energy ratio.The morphological characteristics and roughness of HVA are examined by utilizing microscopic AFM tests,and the adhesion in conjunction with microscopic adhesion force are described accordingly.The results indicate that a high dose of high viscosity modifier reduces the viscosity behavior,relaxation capacity and low-temperature performance of asphalt,and that Jc,stiffness modulus and m-value show a consistency rule.The compound modification with SBS and HVA-U remarkably improves the adhesion of asphalt,but relatively degrades the water stability of asphalt-aggregate system.Further,the large quantity,tiny size,and little height difference of the bee structures are appeared in the AFM height images of the HVA,and the microscopic adhesion force is strongly correlated to the adhesion work.
road engineeringhigh viscosity asphaltlow-temperature performanceadhesion performancesurface free energyatomic force microscope
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