沥青再生过程中新-旧沥青界面混溶行为综述

doi:10.11896/cldb.19070255

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Abstract With the rapid increase of highway mileage and the increase of recycled asphalt mixture (RAP) year by year, the researchers have carried out research on the recycling technology of recycled asphalt mixture. It could be found from the research that the whole performance of recycled asphalt pavement has dropped dramatically because of the increase of the amount of recycled asphalt mixture. When it comes to the reason, virgin asphalt and aged asphalt can not be fully integrated during the regeneration of recycled asphalt mixture. On account of the increasing amount of recycled asphalt mixture, it is imperative to explore effective handling approach to recycled asphalt mixture. And it remains to be discussed about the influence of high-content RAP on the road performance of recycled asphalt pavement. It is necessary to establish a complete theoretical system about the mixture of virgin asphalt and aged asphalt in order to solve a series of regeneration problems, which could help to explore the diffusion zone and diffusion path of virgin asphalt as well as compatible penetrant in aged asphalt.
Up to now, the scholars at home and abroad, on accordance with the deep-scale evolutionary thinking from macroscopic to microscopic, have carried out an analysis of the mixing efficiency of virgin asphalt and aged asphalt from macroscopic, mesoscopic, microscopic and molecular scales, and have developed theoretical models and evaluation indicators through the expansion of the study from the qualitative evaluation of partial fusion to the quantitative analysis of fusion degree. The scholars have probed into the influencing factors and diffusion mechanism of the mixture of virgin asphalt and aged asphalt by making use of the evaluation indexes such as mixing efficiency and diffusion rate, on the strength of Fick diffusion theory and molecular dynamics theory. It could be shown from the research that the factors affecting the mixing of virgin asphalt and aged asphalt include mixing temperature, mixing time as well as material parameters, in which temperature is the main factor. The researchers explored the correlation between construction parameters (RAP content, mixing temperature, mixing time) and pavement performance, which could also improve the recycling efficiency of recycled asphalt mixture.
This paper not only introduces diffusion theory and model, but also summarizes research methods and corresponding evaluation indicators by means of synthesizing the research results at home and abroad. Speaking of the experimental research, it makes a detailed introduction to some technologies in the use of the mixture of virgin asphalt and aged asphalt such as molecular tracing, stratification extraction, gel permeation chromatography (GPC), Fourier transform infrared spectroscopy (FTIR) and atomic force microscopy (AFM) on the basis of the problems and deficiencies solved in the analysis and research. In consideration of the macro level of current research status, the researchers carry out a comparative analysis to determine the defects of mixing efficiency by separately making use of the rheological properties and predictive properties of recycled asphalt and recycled asphalt mixture. For this reason, researchers mostly adopt the combination of macroscopic and microscopic scale to verify the reliability of the test and also point out a lot of factors that influence the degree of the mixture of virgin asphalt and aged asphalt.

Key words： virgin asphalt and aged asphalt degree of blend recycled asphalt mixture blending efficiency

Published: 24 June 2020

CLC number:

U416

Fund:National Natural Science Foundation of China (NSFC) (51708072), the Science and Technology Commission Project of Chongqing (cstc2016jcyjA1499, cstc2019jcyj-msxmX0302),the Science and Technology Department Project of Sichuan (2019YJ0714),the Postgraduate Innovation Project of Chongqing Jiaotong University (2018S0115)

About author:: Peng Guo, Ph.D., associate professor, master tutor. Mainly engaged in research on roads and building materials. He has presided over 1 National Natural Science Fund, 6 provincial and ministerial level projects and enterprise unit projects, participated in 1 Chongqing Transportation Science and Technology Project, 2 national and local joint engineering laboratory fund projects for transportation and civil engineering materials, and published 12 academic papers, 2 patents were authorized by the state.

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	GUO Peng
	XIE Fengzhang
	MENG Jianwei
	MENG Xianchun
	WEI Lin
	XU Jian
	FENG Yunxia

Cite this article:

GUO Peng,XIE Fengzhang,MENG Jianwei, et al. Review on the Interface Blending Behavior of Virgin Asphalt and Aged Asphalt During Asphalt Reclaiming[J]. Materials Reports, 2020, 34(13): 13100-13108.

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http://www.mater-rep.com/EN/10.11896/cldb.19070255 OR http://www.mater-rep.com/EN/Y2020/V34/I13/13100

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