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Fusion state and dispersion characteristics of lightstabilizer inside asphalt carrier(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2020年6期
Page:
22-34
Research Field:
道路工程
Publishing date:

Info

Title:
Fusion state and dispersion characteristics of lightstabilizer inside asphalt carrier
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）
Keywords:
road engineering;  modified asphalt;  dispersion analysis;  light stabilizer;  characterization
PACS:
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DOI:
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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.

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Last Update: 2020-12-17