Effect of Ageing on Rheological Properties and Self-healing Temperature of Asphalt
Asphalt pavements have some self-healing capacity for microcracks,but the self-healing capacity is affect-ed by ageing of the asphalt binder and changes in rheological properties.The differences in rheological parameters such as composite shear modulus,phase angle and self-healing temperature of unaged asphalt,short term aged asphalt and long term aged asphalt with different degrees of aging,as well as the self-healing temperature,were comparatively stud-ied using a Dynamic Shear Rheometer(DSR)and the effects of aging on rheological properties of the asphalt and the self-healing temperature were investigated.The results showed that aging increased the composite shear modulus of as-phalt,decreased the phase angle,hardened the asphalt,decreased the viscous component,and decreased the fluidity.Short-term aging,long-term aging,and delayed long-term aging increased the initial healing temperature of asphalt by 8.40 ℃,20.90 ℃,and 28.00 ℃,respectively.
asphaltagingrheological propertiesself-healing temperature
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