Abstract
Bitumen is widely used in road construction, but it is an organic mixture with complex compounds and chemical structures which will change after exposure to heat, oxygen, and ultraviolet radiation (UV) and make the physical properties worse, especially at low temperature. In this paper, different aging levels (TFOT, UV-6 days) of asphalt binders with various mass ratio of layer clay powder to asphalt (0, 3%, 5%) were considered to investigate the low temperature rheological properties of aged asphalt binders and low temperature strength as well as fatigue properties. Dynamic Shear Rheometer (DSR) and Universal Testing Machine (UTM) were used to evaluate low temperature properties of bitumen and mixture. The aging evaluation shows that the aging resistance of bitumen and its mixture is improved and this improvement of low temperature properties can be better maintained compared to base asphalt.
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