中国塑料 ›› 2025, Vol. 39 ›› Issue (5): 43-49.DOI: 10.19491/j.issn.1001-9278.2025.05.007

• 材料与性能 • 上一篇    下一篇

胶粉/SBS复合改性沥青抗老化性能与机理研究

陈梦1(), 李文良1, 张涛2, 张文才3, 杨喜英3   

  1. 1.山西省交通建设工程质量检测中心(有限公司),太原 030032
    2.山西交科公路勘察设计院有限公司,太原 030032
    3.山西工程科技职业大学,山西 晋中 030619
  • 收稿日期:2024-09-04 出版日期:2025-05-26 发布日期:2025-05-22
  • 作者简介:陈梦(1990—),女,高级工程师,从事道路材料研发及性能分析技术研究,2085474268@qq.com
  • 基金资助:
    山西交通控股集团有限公司科技项目(2021?JKKJ?03);山西省应用基础研究计划(201901D211552)

Anti⁃aging performance and mechanism of asphalts modified with rubber powder/SBS composites

CHEN Meng1(), LI Wenliang1, ZHANG Tao2, ZHANG Wencai3, YANG Xiying3   

  1. 1.Shanxi Transportation Construction Engineering Quality Detection Center (Co,Ltd),Taiyuan 030032,China
    2.Shanxi Jiaoke Highway Survey and Design Institute Co Ltd,Taiyuan 030032,China
    3.Shanxi Vocational University of Engineering Science and Technology,Jinzhong 030619,China.
  • Received:2024-09-04 Online:2025-05-26 Published:2025-05-22

摘要:

为研究胶粉/苯乙烯⁃丁二烯⁃苯乙烯嵌段共聚(SBS)复合改性沥青的抗老化性能与机理,制备了SBS掺量为沥青质量2 %、胶粉掺量分别为20 %、25 %、30 %、35 %(质量分数,下同)的复合改性沥青,进行短期老化和不同程度压力老化容器(PAV)老化后,对其抗老化性能进行评价。研究结果表明:老化后,复合改性沥青的高温抗车辙性能提升,针入度、延度、弹性恢复性能、疲劳性能和低温抗变形能力等均发生衰减,衰减幅度随胶粉掺量增加而减小。通过红外光谱技术分析了抗老化性能提升的机理,随着胶粉掺量增加,老化沥青羰基指数、亚砜基指数和红外老化指数(I)的变化幅度变小,红外老化指数方程的斜率也从0.010 39下降至0.005 19,胶粉增强了沥青的抗老化性能。建立的红外老化指数预测模型,可综合评价胶粉掺量和老化时间两项因素对I值的影响;关联微观指标I与宏观指标低温蠕变比值(k)建立的k值预测模型准确、有效,可对复合改性沥青的低温抗老化性能进行快速对比分析。

关键词: 胶粉, 改性沥青, 抗老化机理, 红外老化指数, 低温抗老化性能, 预测模型

Abstract:

To explore the anti⁃aging performance and mechanism of asphalt modified with rubber powder/SBS composites, a series of modified asphalts were prepared by incorporating 2 wt% SBS and 20, 25, 30, and 35 wt% rubber powders. The anti⁃aging performance of the modified asphalts after short⁃term aging and pressure aged vessel aging at different degrees was evaluated. The results indicated that the high⁃temperature rutting resistance of the modified asphalts was improved, and their penetration, ductility, elastic recovery, fatigue performance, and low temperature deformation resistance were deteriorated after aging. The deterioration degree decreased as the rubber powder content increased. The enhancement mechanism of anti⁃aging performance was analyzed by infrared spectroscopy. The variation ranges of carbonyl index, sulfoxide index, and infrared aging index of the aged asphalts became smaller with an increase in content of rubber powders, and the slope of infrared aging index equation decreased from 0.010 39 to 0.005 19. Rubber powders enhanced the anti⁃aging performance of the modified asphalts. The influence of the rubber powder content and aging time on the infrared aging index could be comprehensively evaluated by an infrared aging index prediction model. The k prediction model of low⁃temperature creep ratio (k) established by correlating the infrared aging index as a microscopic index with the k value as a macroscopic index was accurate and effective, and it could be used for rapid comparative analysis on the low⁃temperature anti⁃aging performance of the modified asphalts.

Key words: rubber powder, modified asphalt, anti?aging mechanism, infrared aging index, low temperature anti?aging performance, prediction model

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