Quantitative characterization of fusion state of virgin and aged asphalt using nano-ferrous ferric oxide tracer

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外文摘要：The exact evaluation of the fusion rate of virgin and aged asphalt is essential to optimize the performance of the recycled asphalt mixture.The fusion rate index was developed by tracing the distribution of tracer asphalt,which contains nano-ferrous ferric oxide(nano-Fe3O4)tracer.Laboratory fusion simulation tests were performed on three types of asphalt to obtain different fusion states,and fatigue tests were performed to evaluate the influence of the fusion rate on the fatigue life of the recycled asphalt.It was found that the tracer asphalt containing 4％nano-Fe3O4 shows the optimal trace effect,and the developed fusion rate index can quantitatively characterize the influence of different factors on the fusion state of the recycled asphalt.The fusion state is closely related to the fatigue performance of recycled asphalt,and the fusion rate index can fairly evaluate its fatigue performance.The relationship between the fusion rate and the fatigue life of recycled asphalt depends on the factors that cause the fusion rate variation.Under the influence of the amount of rejuvenator,the fatigue life of recycled asphalt grows exponentially with increasing fusion rate due to enhancement of molecular motion as well as a supplement of lightweight components.Under the influence of heat preservation treatment,fatigue life increases linearly with increasing fusion rate.The proposed fusion rate index can be utilized to quantitatively characterize the fusion state of virgin and aged asphalt,thus providing a simple way to guide the practical application of recycled asphalt.

外文关键词：

Recycled asphaltRejuvenatorTracing techniqueFusion rateFatigue

作者：

Qiang Li、Song Liu、Huameng Wen、Zhou Zhou

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作者单位：

College of Civil Engineering,Nanjing Forestry University,Nanjing 210037,China

School of Transportation,Southeast University,Nanjing 211189,China

基金：

Natural Science Foundation of Jiangsu ProvinceNatural Science Foundation of Jiangsu ProvinceJiangsu Province"333 Highlevel Talent"Project(sixth round)Industry-University-Research Collaboration Project of Jiangsu Province

项目编号：

BK20181404BK20220419BY2021313

出版年：

2024

DOI：

10.1016/j.jtte.2023.02.006

交通运输工程学报(英文版)

CSTPCD

ISSN：2095-7564

年,卷(期)：2024.11(3)