Abstract
In order to evaluate the performance of the physical foaming warm-mix recycled asphalt mixture (WRAM), the hot mix plant recycling technology was adopted to develop AC-20 hot-mix recycled asphalt mixture (HRAM) and the WRAM of different reclaimed asphalt pavement (RAP) contents. The high temperature stability, water stability and low temperature crack resistance performance of the reclaimed asphalt pavement were evaluated. The results indicate that the physical foaming WRAM feature better high temperature stability, water stability and low temperature crack resistance compared to those of HRAM. With the increase in RAP contents, the high temperature stability of the physical foaming WRAM and HRAM rises notably but the water stability and low temperature crack resistance performance continues to drop.
Highlights
With the development of China’s economy, the highway construction has gradually shifted from “construction oriented” to “equal attention paid to construction and maintenance”
When the reclaimed asphalt pavement (RAP) content reaches 50%, both the retained Marshall stability and the freeze-thaw tensile strength of the the warm-mix recycled asphalt mixture (WRAM) are close to the required values, indicating that the RAP content of the hot-mix recycled asphalt mixture (HRAM) and the WRAM should be kept under 40% and 50%, respectively
When the content reaches 40%, the failure value of the HRAM is close to the required value; when the content reaches 50%, the failure strain of the WRAM is lower than the required value, which is because the asphalt in the RAP ages, and the adhesion is increasing and has poor low temperature performance
Summary
With the development of China’s economy, the highway construction has gradually shifted from “construction oriented” to “equal attention paid to construction and maintenance”. Some scholars have proposed to combine the recycling technology and the warm mix technology to develop the warm-mix recycling technology. This paper took AC-20 as an example to study the performance of the physical foaming warm-mix recycled asphalt mixture and studied the influence of different RAP contents on the road performance using HRAM and WRAM. It can provide guidance for the promotion and application of the physical foaming warm-mix recycling technology
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
