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SARA组分对硬沥青疲劳性能的影响

Effect of SARA Fractions on Fatigue Properties of Hard Asphalt.

作者信息

Jiang Jinyi, Lu Fei, Guo Xiaogang, Hao Peiwen, Wang Wei, Yu Jincheng

机构信息

Key Laboratory of Road Structure & Material, Ministry of Communication, Chang'an University, Xi'an 710064, China.

Zhejiang Engineering Research Center of Digital Highway Applied Technology, Zhejiang Institute of Communications, Hangzhou 311112, China.

出版信息

Materials (Basel). 2024 Jun 3;17(11):2713. doi: 10.3390/ma17112713.

DOI:10.3390/ma17112713
PMID:38893977
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11173431/
Abstract

The fatigue performance of hard asphalt is an important factor that affects the service life of asphalt pavement. In order to comprehensively explore the influence of chemical components on the fatigue performance of hard asphalt, and to eliminate the chemical instability between the microstructure of asphalt from different oil sources, seven kinds of hard asphalt were designed and prepared with saturates, aromatics, resins, and asphaltenes (SARA) extracted from the same hard asphalt. Rheological, time sweep and linear amplitude sweep (LAS) tests were carried out to evaluate the fatigue properties. The results show that the complex modulus of asphalt binds increased rapidly with an increase of asphaltene and resins and that the colloidal structure was strengthened, which would increase the fatigue factor. In the time sweep test, the strength of the colloidal structure significantly affected the fatigue life, and the fatigue life was different under different test stresses. In the viscoelastic continuum damage (VECD) model, the cumulative damage was related to the modulus, while with the increase of asphaltene and resins, the fatigue life showed a trend of first increasing and then decreasing. The linear regression analysis showed that the fatigue life of hard asphalt had a good correlation with strain sensitivity. This study investigated the applicability of different fatigue evaluation methods and revealed the influence of four components on the fatigue properties of hard asphalt. The results provide significant insights in the improvement of the fatigue performance of both hard asphalt and corresponding mixtures.

摘要

硬沥青的疲劳性能是影响沥青路面使用寿命的重要因素。为了全面探究化学成分对硬沥青疲劳性能的影响，并消除不同油源沥青微观结构间的化学不稳定性，从同一种硬沥青中提取饱和烃、芳烃、胶质和沥青质（SARA），设计并制备了七种硬沥青。通过流变、时间扫描和线性振幅扫描（LAS）试验来评估疲劳性能。结果表明，随着沥青质和胶质含量的增加，沥青胶结料的复数模量迅速增大，胶体结构增强，这会增加疲劳因子。在时间扫描试验中，胶体结构强度显著影响疲劳寿命，不同试验应力下疲劳寿命不同。在粘弹性连续损伤（VECD）模型中，累积损伤与模量有关，随着沥青质和胶质含量的增加，疲劳寿命呈先增大后减小的趋势。线性回归分析表明，硬沥青的疲劳寿命与应变敏感性具有良好的相关性。本研究考察了不同疲劳评价方法的适用性，揭示了四种组分对硬沥青疲劳性能的影响。研究结果为提高硬沥青及其相应混合料的疲劳性能提供了重要见解。

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