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Experimental study on high temperature performance of PU-SBS composite modified asphalt
- Journal of Civil and Environmental Engineering Vol. 44, Issue 6, Pages: 162-169(2022)
- 作者机构：
同济大学 先进土木工程材料教育部重点实验室
材料科学与工程学院，上海 201804
- 作者简介：
brief:WEN Yutong (1995- ), main research interest: reinforced asphalt pavement materials, E-mail: ytwen@tongji.edu.cn.
JIANG Zhengwu （corresponding author）， professor， doctorial supervisor， E-mail： jzhw@tongji.edu.cn.
- 基金信息：National Key R&D Program of China(2018YFC0705404);Natural Science Foundation of China(51878480;52078369);Fundamental Research Funds for the Central Universities
DOI：10.11835/j.issn.2096-6717.2022.005
CLC： U414Received：08 October 2021，
Published：30 December 2022
- 稿件说明：
移动端阅览
温宇彤,徐玲琳,谢明君等.PU—SBS复合改性沥青的高温性能试验研究[J].土木与环境工程学报,2022,44(06):162-169.
WEN Yutong,XU Linglin,XIE Mingjun,et al.Experimental study on high temperature performance of PU-SBS composite modified asphalt[J].Journal of Civil and Environmental Engineering,2022,44(06):162-169.
温宇彤,徐玲琳,谢明君等.PU—SBS复合改性沥青的高温性能试验研究[J].土木与环境工程学报,2022,44(06):162-169. DOI： 10.11835/j.issn.2096-6717.2022.005.
WEN Yutong,XU Linglin,XIE Mingjun,et al.Experimental study on high temperature performance of PU-SBS composite modified asphalt[J].Journal of Civil and Environmental Engineering,2022,44(06):162-169. DOI： 10.11835/j.issn.2096-6717.2022.005.
摘要
聚合物改性是提升沥青高温性能的重要途径。采用聚氨酯（PU）和苯乙烯—丁二烯—苯乙烯嵌段共聚物（SBS）制备一种复合改性沥青，研究引入PU-SBS对沥青高温性能的影响及改性机理。结果表明，PU-SBS复合改性显著降低了沥青的针入度，提高了软化点和黏度，有效提升了沥青的高温流变性能，改性效果明显优于单一聚合物改性。PU-SBS复合改性沥青在高温下有良好的抗永久变形能力和弹性恢复能力。64 °C时
其车辙因子
G
*/sin
δ
值达到18.35 kPa，分别为同条件下SBS改性沥青、PU改性沥青的2.6、1.6倍。此外，PU-SBS复合改性主要通过聚合物在沥青中的吸附交联及与沥青组分的化学反应来提升沥青的高温性能。
Abstract
Polymer modification is an important way to improve the high temperature performance of asphalt. In this work
PU-SBS composite modified asphalt was prepared by PU and SBS， and the effect of PU-SBS on high temperature performance of asphalt and modification mechanism were studied. The results show that PU-SBS composite modification can significantly reduce the penetration of asphalt and improve the softening point. PU-SBS modified asphalt can effectively improve the viscosity and high temperature rheological properties of asphalt
and the modification effect is obviously better than that of single polymer modification. PU-SBS modified asphalt has good permanent deformation resistance and elastic recovery at high temperature. The rutting resistance factor
G
*/sin
δ
at 64 °C reaches 18.35 kPa
which is 2.6 times and 1.6 times of SBS modified asphalt and PU modified asphalt under the same conditions
respectively. In addition
PU-SBS composite modification combines physical and chemical modification to improve the high temperature performance of asphalt: physical adsorption swelling of SBS in asphalt and chemical reaction of PU with asphalt components.
关键词
Keywords
references
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