[1]孙晓龙,覃潇,尹应梅,等.沥青载体中光稳定剂熔融历程与分散特性[J].长安大学学报(自然科学版),2020,40(6):22-34.
 SUN Xiao long,QIN Xiao,YIN Ying mei,et al.Fusion state and dispersion characteristics of lightstabilizer inside asphalt carrier[J].Journal of Chang’an University (Natural Science Edition),2020,40(6):22-34.
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沥青载体中光稳定剂熔融历程与分散特性()
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长安大学学报(自然科学版)[ISSN:1006-6977/CN:61-1281/TN]

卷:
第40卷
期数:
2020年6期
页码:
22-34
栏目:
道路工程
出版日期:
2020-11-15

文章信息/Info

Title:
Fusion state and dispersion characteristics of lightstabilizer inside asphalt carrier
作者:
孙晓龙覃潇尹应梅侯荣国曾东方
(1. 广东工业大学 土木与交通工程学院,广东 广州 510006; 2. 佛山科学技术学院 交通与土木建筑学院,广东 佛山 528225; 3. 交通运输部公路科学研究院,北京 100088)
Author(s):
SUN Xiaolong1 QIN Xiao2 YIN Yingmei1 HOU Rongguo3 ZENG Dongfang1
(1. School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006,Guangdong, China; 2. School of Transportation and Civil Engineering and Architecture,Foshan University, Foshan 528225, Guangdong, China; 3. Research Institute ofHighway Ministry of Transport, Beijing 100088 , China)
关键词:
102 102) background-color: rgb(255 255 255) font-family: Arial Verdana sans-serif font-size: 12pt">道路工程改性沥青分散性分析光稳定剂表征
Keywords:
road engineering modified asphalt dispersion analysis light stabilizer characterization
文献标志码:
A
摘要:
针对光稳定剂在沥青路面材料中抗紫外改性效应的差异性问题,采用T770受阻胺光稳定剂制备光稳定改性沥青,基于不同试验设计方案,分别制备光稳定改性沥青膜与柱状沥青试件,借助聚离子束扫描电镜解析T770光稳定剂在沥青中的典型微观形貌及元素分布特征,系统研究柱状光稳定改性沥青试件中不同层位沥青的物理性能变化规律。基于图像分析技术,识别和表征光稳定剂颗粒在沥青中的分散状况及粒度组成特征,在此基础上,深入分析不同层位光稳定改性沥青的热失重特性。结果表明:在融入沥青载体过程中,受阻胺光稳定剂主要存在流态及结晶态2种特征微观形貌,其中,结晶态结构主要出现在未熔化光稳定剂边界位置,流态结构则主要出现在光稳定剂与沥青接触部分,或直接出现在沥青载体形貌中;下部光稳定改性沥青物理性能及光稳定剂含量与上部沥青存在一定差异;在可识别微区范围内,受阻胺光稳定剂在沥青材料中多以2~3 μm粒度分散,在中、下部沥青中则存在少量10 μm粒径以上的大粒度光稳定剂;相较中下部沥青,光稳定改性沥青试件的上部沥青热失重起始温度提高了约10.8%,而热失重率则降低了约9.3%。对受阻胺光稳定剂分散特性的研究成果可为光稳定剂应用于沥青路面材料紫外老化控制提供相关依据
Abstract:
Amid at the difference in antiultraviolet modification effect of histamine light stabilizer in asphalt pavement materials, modified asphalt was prepared with T770 histamine light stabilizer. Based on different specimen design plans, asphalt membrane and columnar asphalt specimens were prepared separately. The typical micromorphology and element distribution characteristics of T770 lightstabilizer in asphalt were analyzed by FIBSEM technology. On this basis, the physical properties of different layer asphalts in lightstabilized modified asphalt columnar specimens were systematically studied. Based on the image recognition technology, the dispersion conditions and particle size composition characteristics of lightstable particles in asphalt of different layers were identified and analyzed. The thermal weight loss characteristics of lightstabilized modified asphalt at different positions were analyzed. The results show that during the melting process of asphalt, light stabilizer mainly existed in two typical micromorphologies, fluid and crystalline. The crystalline structure mainly appear at the boundary of the unmelted light stabilizer. The fluid structure mainly appear in the contact part between light stabilizer and asphalt, or directly in the morphology of asphalt. The softening point and light stabilizer content of the light stabilized modified asphalt at the bottom are different from those of the upper asphalt. Within the identifiable range, light stabilizer is mostly dispersed in asphalt with the particle size of 2 to 3 μm, while a small number of large light stabilizer particles above 10 μm existed in the middle and bottom asphalt samples. Compared with the middleupper bitumen, the onset temperature of upper sample of light stabilized modified bitumen sample is increased by about 10.8%, while the thermal weight loss rate is decreased by about 9.3%. This paper would provide reference for the relevant study of light stabilizer used inside asphalt pavement material for ultraviolet aging control. 6 tabs, 20 figs, 27 refs.
更新日期/Last Update: 2020-12-17