Evaluation of Loss Factor of Styrene-Butadiene-Styrene Modified Asphalt under Wide Temperature Range and Aging

摘要

The damping property of asphalt is essential in reducing pavement vibration and noise. This study mainly presents the damping property of the styrene-butadiene-styrene (SBS) modified asphalt under a wide temperature range and aging. The materials used 11 total combinations of the base asphalt, three modifiers (SBS, crumb rubber [CR], and polythene), and three additives (hydrotalcite, crosslinker, and plasticizer). The loss factor (LF) was first measured by the dynamic shear rheometer. Then, the four parameters, namely glass transition temperature (Tg), the maximum loss factor (LFmax), effective temperature range of damping (??T0.7), and area under the loss factor curve (TA), were used to evaluate the damping characteristics of asphalt at a wide temperature range. Based on this, the damping property of the base, SBS, and CR of aged asphalt is analyzed. The results show that in the medium- and high-temperature regions, the crosslinker and plasticizer can effectively improve the temperature sensitivity of SBS modified (SM) asphalt and the damping property. Adding plasticizer and crosslinker at the same time improves the damping property of asphalt most significantly. In the middle-low temperature region, both the SM asphalt and CR modified asphalt have a poor damping property, and the crosslinker and plasticizer have no apparent effect on the improvement of SM asphalt. The damping property of SM asphalt decreases more slowly than that of base asphalt after aging, and it still has a good damping property. The outlined research results show that SM asphalt has a good damping capacity of pavement at medium- and high-temperature ranges and after aging, which can assist in developing a sustainable solution to extend the service life of pavement without increasing the thickness of pavement.