Abstract: In northern China, the summer is hot and winter is cold. Asphalt pavement is prone to thermal aging easily at high temperature, and suffers freeze-thaw cycles at low temperature, which will affect the performance of asphalt. The short-term and long-term thermal aging test and freeze-thaw cycle test were carried out in this work upon the matrix asphalt and crumb-rubber-modified asphalt to simulate environmental impact, and subsequently the bending beam rheometer was employed to measure the asphalts’ bending creep stiffness S and creep rates m. We analyzed the changes of low temperature performances of these two kinds of asphalts which had experienced different salt freezing cycle times and different thermal aging modes, and moreover, observed their microstructure variations by an atomic force microscope (AFM). It can be concluded that thermal aging exerts serious influences on the low temperature anti-cracking performances and anti-deformation performances of both the matrix asphalt and rubber-modified asphalt. Therefore, it is of great importance to prevent and control thermal aging of asphalt pavement in seasonal frozen are in order to ensure the road service life. Compared with matrix asphalt, the crumb-rubber-modified asphalt exhibited a relatively better low temperature performance, including flexibility and deformation resistance, after salt freezing cycles and thermal aging, and displayed a more favorable compatibility in northern cold regions.
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2018, Vol. 32 
