天然沥青改性沥青的表面自由能分析

马峰; 郝景贤; 傅珍; 汪立龙; 汪林兵

doi:10.19818/j.cnki.1671-1637.2015.01.003

天然沥青改性沥青的表面自由能分析

doi: 10.19818/j.cnki.1671-1637.2015.01.003

1.
长安大学特殊地区公路工程教育部重点实验室, 陕西西安 710064
2.
中交公路规划设计研究院有限公司, 北京 100088
3.
弗吉尼亚理工大学土木与环境工程系, 弗吉尼亚黑堡 24061

基金项目:

国家自然科学基金项目 51108038

国家自然科学基金项目 51108039

国家自然科学基金项目 51310105031

国家自然科学基金项目 51310105032

国家国际科技合作专项项目 2013DFA81910

陕西省科技计划项目 2013KJXX-94

详细信息

作者简介:
马峰(1978-), 男, 安徽宿州人, 长安大学副教授, 工学博士, 从事公路工程材料研究

中图分类号: U414.75
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出版历程
- 收稿日期: 2014-09-16
- 刊出日期: 2015-02-25

Surface free energy analysis of asphalt modified with natural asphalt

1.
Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang'an University, Xi'an 710064, Shaanxi, China
2.
CCCC Highway Consultants Co., Ltd., Beijing 100088, China
3.
Department of Civil and Environmental Engineering, Virginia Polytechnic Institute and State University, Blacksburg 24061, Virginia, USA

More Information

Author Bio:
MA Feng (1978-), male, associate professor, PhD, +86-29-82334823, mafeng@chd.edu.cn

Article Text (Baidu Translation)

摘要

摘要: 为了准确评价天然沥青改性沥青与集料的粘附性能, 采用座滴法测定了3种液体在天然沥青改性沥青试样表面的接触角, 基于表面物理化学理论, 确定了室温条件下沥青表面自由能极性分量和色散分量的测定方法, 计算了基质沥青和不同掺量天然沥青改性沥青的表面自由能。结合水煮法试验结果, 分析了沥青结合料表面自由能与沥青-集料粘附性等级的关系。试验结果表明: 70^#A级基质沥青的表面自由能为10.60 mJ·m^-2, 而8%掺量天然沥青改性沥青表面自由能增加到18.60 mJ·m^-2, 天然沥青的掺加明显提高了天然沥青改性沥青的表面自由能; 采用接触角方法得到的沥青结合料表面自由能和沥青-集料的粘附性能具有较好的相关性; 天然沥青含有氧、硫、氮等多种极性较强的官能团, 较高的沥青质含量及网状结构能够吸附基质沥青中的饱和分和芳香分等轻质成分, 两方面的共同作用提高了天然沥青改性沥青的表面自由能。
- 道路工程 /
- 天然沥青改性沥青 /
- 表面自由能 /
- 沥青-集料粘附性 /
- 接触角
Abstract: In order to accurately evaluate the adhesion of asphalt modified with natural asphalt and aggregate, the contact angles of three liquids on the sample surface of asphalt modified with natural asphalt were measured based on sessile drop method. According to the theory of surface physical chemistry, the measuring method of polar component and dispersion component for asphalt surface free energy under the condition of room temperature was determined. The surface free energies of base asphalt and asphalts modified with different dosages of natural asphalt were calculated. The relationship between asphalt surface free energy and asphalt-aggregate adhesion grade was analyzed based on the test result by using water-boiling method. Test result shows that the surface free energies of 70^# grade A base asphalt and asphalt modified with 8% natural asphalt are 10.60, 18.60 mJ·m^-2 respectively, so the surface free energy of asphalt modified with natural asphalt increases distinctly with the addition of natural asphalt. There is a good correlation between asphalt-aggregate adhesion and the surface free energy of asphalt calculated by contact angle method. The natural asphalt contains higher polar functional groups such as O, S and N etc. High contents of asphaltene and net structure can absorb the light components of base asphalt such as saturates, aromatics. The increase of surface free energy for asphalt modified with natural asphalt is attributed to the polar functional groups and the absorbing functions.
- road engineering /
- asphalt modified with natural asphalt /
- surface free energy /
- asphaltaggregate adhesion /
- contact angle

HTML全文

图 1 水在沥青表面的座滴

Figure 1. Sessile drops on surfaces of asphalts

下载: 全尺寸图片幻灯片

图 2 γ_l与γ_lcos(θ)关系

Figure 2. Relationship betweenγ_landγ_lcos(θ)

下载: 全尺寸图片幻灯片

图 3 极性分量与色散分量计算

Figure 3. Calculation of polar and dispersion components

下载: 全尺寸图片幻灯片

图 4 沥青表面自由能与粘附性等级

Figure 4. Surface free energies and adhesion grades of asphalts

下载: 全尺寸图片幻灯片

表 1 沥青技术性质

表 2 沥青与集料粘附性等级

Table 2. Asphalt-aggregate adhesion grades

表 3 沥青与测试液体的接触角

Table 3. Contact angles of asphalts and test liquids

表 4 沥青的表面自由能及其分量

Table 4. Surface free energies and components of different asphalts mJ·m^-2

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