基于荧光显微量化分析的SBS改性沥青溶胀行为表征
Swelling Behavior Characteristic of SBS Modified Asphalt Based on Fluorescence Image Quantitative Analysis
向彬 1蒋港平 1李元元 1纪皓文1
作者信息
- 1. 武汉工程大学土木工程与建筑学院,湖北武汉 430070
- 折叠
摘要
SBS是改性沥青中最常用的改性剂,其溶胀状态对沥青性能具有显著影响.通过针入度、软化点、延度等试验研究了SBS改性沥青的宏观性能;基于荧光显微技术,研究了对不同剪切时间下SBS改性沥青中SBS相场分布和溶胀状态,并对SBS的溶胀发育行为进行了量化表征;建立了宏观性能与显微形态参数的线性关系模型,并分析显微形态参数对宏观性能的影响规律.分析结果表明:剪切时间对SBS改性沥青的物理性能有显著影响.随着剪切时间的增加,SBS颗粒的数量、长短轴比、圆形度、面积比和平均面积均发生了变化.剪切时间由5 min增加至55 min,SBS颗粒数量增加了 68％;长短轴比值增加了 47％,颗粒形状由椭圆趋向长条状变化;SBS颗粒面积比增加了 40.88％,平均面积增大了 24.93倍.剪切60～90 min,SBS颗粒继续溶胀发育,SBS颗粒数重复剪切5～55 min的变化过程.SBS颗粒的面积比和平均面积与宏观性能中的软化点存在显著的线性关系.
Abstract
SBS is the most commonly used modifier for modified asphalt,and its solubilization state has a significant effect on the performance of asphalt.The macroscopic properties of SBS modified asphalt were investigated by needle penetration,softening point and ductility tests.Based on fluorescence microscopy technology,the phase field distri-bution and swelling state of SBS in SBS modified asphalt were studied under different shear times,and the swelling development behavior was quantitatively characterized.A linear relationship model between macroscopic properties and micro morphological parameters was built to analyze the effect of micro morphological parameters on macroscopic properties.The analysis results showed that the shear time had a significant effect on the physical properties of SBS modified asphalt.With the increase of shear time,all the numbers,major-minor axis ratio,circularity,area ratio and the average area of SBS particles changed.When the shear time increased from 5 min to 55 min,the number of SBS particles increased by 68％,the major to minor axis ratio increased by 47％,the shape of the particles changed from ellipse to strip,the area ratio of SBS particles increased by 40.88％,the average area increased by 24.93 times.When the shear time was 60～90 min,SBS particles continued to swell and develop,SBS particle number repeated the same change process as one under 5～55 min.There is a significant linear relationship between the area ratio and mean area of the SBS phase field and the softening point in the macroscopic properties.
关键词
SBS改性沥青/制备工艺/溶胀机理/荧光图像/量化分析Key words
SBS modified asphalt/preparation process/swelling mechanism/fluorescence image/quantitative analysis引用本文复制引用
基金项目
湖北省交通运输厅科技项目(2023-121-1-08)
武汉工程大学第十五届研究生教育创新基金项目(CX2023361)
出版年
2024
国家科技期刊平台
NSTL
维普
万方数据