Li Shuai, Xu Wenyuan, Zhang Fengfa, Wu He, Zhao Pengchao
College of Civil Engineering, Northeast Forestry University, Harbin 150040, China.
Heilongjiang Institute of Technology, College of Civil Engineering, Harbin 150050, China.
Polymers (Basel). 2022 Jan 23;14(3):453. doi: 10.3390/polym14030453.
In this study, the novel nanomaterial graphene oxide (GO) was added as a modifier to polyurethane-styrene-butadiene-styrene (SBS)-modified asphalt, and a graphene oxide/polyurethane/SBS composite-modified asphalt mix was prepared. The effect of the graphene oxide material on the low-temperature crack resistance of the asphalt and mixes was investigated by bending beam rheometer (BBR) tests, beamlet bending tests at different low temperatures, and characterization by scanning electron microscopy for its microscopic condition. OpenCV image processing was used to visually represent the low-temperature cracking of the mix. The results of the BBR tests showed that the incorporation of graphene oxide resulted in a reduction in creep stiffness and an increase in creep rate compared with the control asphalt. The best improvement in the low-temperature cracking resistance of the polyurethane/SBS-modified asphalt was achieved at 0.5% GO doping. The results of the small beam flexural tests showed that graphene oxide as a modifier improved the flexural strength and flexural strain of the mix, resulting in a mix with a lower stiffness modulus and a better relaxation stress capacity with the addition of graphene oxide, which is also expressed through the OpenCV images. Graphene oxide significantly improved the low-temperature crack resistance of polyurethane-SBS-modified asphalt and its mixes. As a new type of nanomaterial-modified asphalt, graphene oxide/polyurethane/SBS composite-modified asphalt shows promising applicability in cold zone roads.
在本研究中，将新型纳米材料氧化石墨烯（GO）作为改性剂添加到聚氨酯-苯乙烯-丁二烯-苯乙烯（SBS）改性沥青中，制备了氧化石墨烯/聚氨酯/SBS复合改性沥青混合料。通过弯曲梁流变仪（BBR）试验、不同低温下的小梁弯曲试验以及扫描电子显微镜对其微观状态进行表征，研究了氧化石墨烯材料对沥青及混合料低温抗裂性能的影响。利用OpenCV图像处理技术直观呈现混合料的低温开裂情况。BBR试验结果表明，与对照沥青相比，添加氧化石墨烯导致蠕变劲度降低，蠕变速率增加。在GO掺杂量为0.5%时，聚氨酯/SBS改性沥青的低温抗裂性能得到最佳改善。小梁弯曲试验结果表明，氧化石墨烯作为改性剂提高了混合料的抗弯强度和抗弯应变，添加氧化石墨烯后混合料的劲度模量降低，松弛应力能力增强，这也通过OpenCV图像得以体现。氧化石墨烯显著提高了聚氨酯-SBS改性沥青及其混合料的低温抗裂性能。作为一种新型纳米材料改性沥青，氧化石墨烯/聚氨酯/SBS复合改性沥青在寒冷地区道路中显示出良好的应用前景。
