Abstract
Road construction consumes a lot of resources and produces a lot of waste and other pollutants. With the emergence of a resource and energy crisis, how to make efficient use of rap has become the research focus of scientific researchers. The interface fusion effect of old and new asphalt in plant mixing and cooling recycling mode is analyzed in order to improve the utilization rate of old asphalt in reclaimed asphalt pavement. In this paper, Materials Studio software was used to establish a bitumen model using the method of four components of bitumen, and then the rationality of the model was verified by density, solubility number and atomic radial distribution function, and the diffusion coefficient obtained from the mean square displacement (MSD) was taken as its evaluation index. The results showed that the diffusion model tends to be stable after 20 ps, and the degree of diffusion increases with the increase in temperature. The degree of diffusion of new asphalt to old asphalt and the degree of diffusion of old asphalt to new asphalt are basically very similar; however, there are some differences at different temperatures. Only a small part of the surface contact between old and new asphalt has been fused, which accords with the partial fusion theory. Compared with Panjin 90# asphalt, the diffusion coefficient of Zhonghaiyou asphalt increases faster with the increase in temperature. The diffusion coefficient increases by 64.3% with the increase of the content of rejuvenators after adding different rejuvenators into the new asphalt. Clarifying the interface fusion effect will be helpful to guide the optimization design of cold-mixing recycled asphalt mixture more scientifically and reasonably. Future research should focus on increasing the fusion effect of old and new asphalt, and explore its influence on the conventional road performance of asphalt mixture.
Highlights
China’s highway traffic has developed very rapidly since the steady implementation of the 13th Five-Year Plan [1,2]
In the process of cold asphalt rejuvenation, the new asphalt and rejuvenator are mixed with the old asphalt on the surface of the reclaimed asphalt pavement (RAP) under certain temperature and stirring conditions, and diffused and miscible with it from outside to inside
The this paper studied the fusion effect of the interface between the old and the new simulation temperatures were selected as 283.15 K, 293.15 K, 303.15 K, 313.15 K, 323.15 K, and 333.15 K
Summary
China’s highway traffic has developed very rapidly since the steady implementation of the 13th Five-Year Plan [1,2]. In the process of cold asphalt rejuvenation, the new asphalt and rejuvenator are mixed with the old asphalt on the surface of the reclaimed asphalt pavement (RAP) under certain temperature and stirring conditions, and diffused and miscible with it from outside to inside. The macro experiment is limited in the study of mechanism, so the diffusion behavior of old and new asphalt can be understood more deeply from the perspective of micro level [6,39]. The fusion behavior of old and new asphalt is analyzed from the micro point of view; the micro action mechanism of recycled asphalt mixture is analyzed, and the real state of the diffusion of old and new asphalt is studied, which provides a certain basis and reference for the mix proportion design and construction process optimization of large amounts of plant mixed cold recycled asphalt mixture in the future
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