| 引用本文: | 李宁利,常紫攀,栗培龙.稻壳油生物沥青老化条件及老化机理研究[J].材料科学与工艺,2025,33(3):11-20.DOI:10.11951/j.issn.1005-0299.20230355. |
| LI Ningli,CHANG Zipan,LI Peilong.Study on aging conditions and mechanisms of rice hull oil bio asphalt[J].Materials Science and Technology,2025,33(3):11-20.DOI:10.11951/j.issn.1005-0299.20230355. |
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| 摘要: |
| 为了建立稻壳油生物沥青结合料模拟短期老化与混合料模拟短期老化的对应关系,将稻壳油生物沥青经过不同温度和不同时间的旋转薄膜烘箱老化(RTFOT)后测试针入度、软化点、延度及135 ℃黏度值,并与混合料短期老化(135 ℃、4 h)后抽提回收的生物沥青进行对比。采用灰色关联度分析法确定生物沥青的短期老化条件,通过FT-IR、GPC实验分析稻壳油生物沥青的老化机理。结果表明:稻壳油生物沥青结合料模拟短期老化的条件为老化时间65 min,老化温度150 ℃；稻壳油生物沥青经过短期老化后,羰基、亚砜基指数及芳香度值变大,小分子量减少,大分子量增多。生物沥青在老化过程中发生氧化反应,轻质组分向沥青质转变,最终导致生物沥青变硬变脆,针入度、延度值变小,软化点及黏度值变大。 |
| 关键词: 道路工程 老化条件 灰色关联度分析法 稻壳油生物沥青 FT-IR GPC |
| DOI：10.11951/j.issn.1005-0299.20230355 |
| 分类号:U41 |
| 文献标识码:A |
| 基金项目:长安大学重点科研平台开放基金项目300102210510；天津市科技计划项目(18JCTPJC55800). |
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| Study on aging conditions and mechanisms of rice hull oil bio asphalt |
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LI Ningli1,2, CHANG Zipan1, LI Peilong2
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(1.School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China; 2. Key Laboratory of Road Structure and Materials, Chang’an University, Xi’an 710064, China)
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| Abstract: |
| In order to establish the correlation between simulated short-term aging of rice husk oil bio bitumen binder and simulated short-term aging of mixture, rice husk oil bio bitumen was tested by RTFOT at different temperatures and for different durations. The penetration, softening point, ductility and viscosity value at 135 ℃ were measured after aging, and compared with the bio bitumen extracted from the mixture after short-term aging (135 ℃, 4 h). The grey correlation analysis was used to determine the short-term aging conditions of bio asphalt, and the aging mechanism of bio asphalt from rice husk oil was analyzed by FT-IR and GPC tests. The experimental results showed that the simulated short-term aging conditions of rice husk oil bio asphalt binder are an aging time of 65 min and an aging temperature of 150 ℃. After short-term aging, the rice husk oil bio asphalt exhibits an increase in carbonyl and sulfone indices, as well as aromaticity. The molecular weight distribution shifts towards higher molecular weights while the content of low molecular weight components decreases. During the aging process, the oxidation reaction occurs, leading to a transformation of lighter components into asphaltene-like substances. This eventually leads to increased hardness and brittleness of the biological asphalt, decreased penetration and ductility values, and increased softening point and viscosity values. |
| Key words: road engineering aging condition grey relation analysis rice hull oil bio asphalt FT-IR GPC |
