Li Shuai, Xu Wenyuan, Zhang Fengfa, Wu He, Ge Qixin
College of Civil Engineering, Northeast Forestry University, Harbin 150040, China.
College of Civil Engineering, Heilongjiang Institute of Technology, Harbin 150050, China.
Polymers (Basel). 2022 Aug 26;14(17):3496. doi: 10.3390/polym14173496.
In order to clarify the effect of the new nano-material graphene oxide on the performance of Polyurethane-SBS modified asphalt and asphalt mixture under the effect of thermal aging, the cracking process of semicircular bending test (SCB) specimens was monitored in situ based on computer vision image processing technology (OpenCV), and the modified asphalt and the cracking characteristics of the modified asphalt and mixture were further analyzed by the tests of semicircular three-point bending and aggregate contact angle measurement. The test results showed that the thermal aging effect severely damaged the composite structure formed by the cross-linking effect of Polyurethane and SBS modifier in asphalt, which intensified the degradation of Polyurethane and SBS modifier and led to great changes in the rheological properties of asphalt after aging. However, the incorporation of the new nanomaterial Graphene oxide can slow down the degradation of Polyurethane and SBS modifiers and the change of asphalt cross-linked composite structure, making the anti-cracking and anti-aging properties of Graphene oxide-Polyurethane-SBS modified asphalt mixes better than those of Polyurethane-SBS modified asphalt mixes. Therefore, the new nano-material graphene oxide added to Polyurethane-SBS modified asphalt is meaningful and feasible. Graphene oxide-polyurethane-sbs composite modified asphalt, as a new nano-material modified asphalt, is stronger against the ultraviolet and light asphalt that is prone to aging. With regards to improving the application of road projects, the results are very promising.
为了阐明新型纳米材料氧化石墨烯在热老化作用下对聚氨酯 - SBS 改性沥青及沥青混合料性能的影响，基于计算机视觉图像处理技术（OpenCV）对半圆弯曲试验（SCB）试件的开裂过程进行原位监测，并通过半圆三点弯曲试验和集料接触角测量试验进一步分析改性沥青及改性沥青混合料的开裂特性。试验结果表明，热老化作用严重破坏了沥青中聚氨酯与 SBS 改性剂交联作用形成的复合结构，加剧了聚氨酯和 SBS 改性剂的降解，导致老化后沥青流变性能发生较大变化。然而，新型纳米材料氧化石墨烯的掺入能够减缓聚氨酯和 SBS 改性剂的降解以及沥青交联复合结构的变化，使得氧化石墨烯 - 聚氨酯 - SBS 改性沥青混合料的抗裂和抗老化性能优于聚氨酯 - SBS 改性沥青混合料。因此，在聚氨酯 - SBS 改性沥青中添加新型纳米材料氧化石墨烯是有意义且可行的。氧化石墨烯 - 聚氨酯 - sbs 复合改性沥青作为一种新型纳米材料改性沥青，对紫外线和易老化的轻质沥青具有更强的抵抗能力。在改善道路工程应用方面，结果非常有前景。
