دانلود رایگان مقاله انگلیسی تجزیه و تحلیل دوام آسفالت بر اساس عملکرد ذاتی و بهبود یافته - الزویر 2018

abstract

The composite performance of modified asphalt is divided into inherent performance and improved performance. The inherent performance of asphalt refers to the original performance of the virgin asphalt. The performance obtained by modifying the virgin asphalt by different methods is referred to the improved performance of the asphalt. In most studies of modified asphalt, researchers pay more attention to how to improve the performance of virgin asphalt at high and low temperatures (i.e., rutting at high temperatures and cracking at low temperatures); however, little attention has been paid to the anti-aging durability of the improved performance. In this project, the macro and micro mechanisms of modified asphalt were compared and analyzed through a series of comparative experiments on the inherent and improved performance of modified asphalt to explore the anti-aging durability of the modified asphalt based on the inherent performance and improved performance at high and low temperatures.

Conclusions

(1) Through comparative analysis of the anti-aging durability of different modified asphalt specimens based on inherent performance and improved performance, the following conclusions can be obtained: for SBS and TPS modified asphalt, taking penetration (performance at high temperatures) and 5 C ductility (performance at low temperatures) as indexes, the anti-aging durability of the penetration based on the inherent performance is less than that of the improved performance. The anti-aging durability of 5 C ductility based on inherent performance is better than that of improved performance. This indicates that the improved high temperature durability of SBS and TPS modified asphalt is better than that of the improved low temperature durability. These two kinds of modified asphalt are suitable for paving pavement in high temperature climate areas.

(2) The improved performance and inherent performance of rubber modified asphalt were analyzed. The inherent performance of the needle penetration (high temperature performance) is better than that of the improved performance, but the inherent performance durability of 5 C ductility (low temperature performance) is worse than that of the improved performance. The results were contrary to the results of the SBS and TPS modified asphalt. This suggests that the particularity of rubber modified asphalt is a factor. It also indicates that rubber modified asphalt has a significant ability to improve low temperature durability and is suitable for pavement construction in cold areas. For Sasobit asphalt, the improved performance of the needle penetration (high temperature performance) and 5 C ductility (low temperature performance) is better than that of the inherent performance. This indicates that Sasobit asphalt is balanced in improving high and low temperature capacity.