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摘要
为了提高苯乙烯-丁二烯-苯乙烯共聚物(SBS)改性沥青的性能,使用纳米ZnO、纳米TiO2与SBS改性沥青进行复合改性。通过对改性沥青进行三大指标、温度扫描以及低温蠕变试验,研究了其物理性能和流变性能,运用红外光谱仪和荧光显微镜进行微观分析。结果表明:随着纳米ZnO和纳米TiO2添加量的增加,纳米ZnO/TiO2/SBS复配改性沥青的针入度减小、软化点增大,高温性能明显改善。此外,纳米ZnO/TiO2/SBS复配改性沥青的复数剪切模量和车辙因子增加,相位角减小,表明其抗车辙性能得到提升。其中3%ZnO和4%TiO2掺量的性能最佳。纳米ZnO/TiO2/SBS复配改性沥青的延度随着纳米改性剂掺量的增加而减小,劲度模量增大,蠕变速率减小,低温性能略有下降。与基质沥青相比,SBS改性沥青中出现新的吸收峰,表明SBS对基质沥青的改性属于化学改性。而在纳米ZnO/TiO2/SBS复配改性沥青中,并未出现新的吸收峰,表明纳米ZnO和TiO2对SBS改性沥青的改性属于物理改性。
Abstract
To enhance the functionality of styrene-butadiene-styrene (SBS) modified asphalt,nano-ZnO and nano-TiO2 were used for composite modification of SBS-modified asphalt.The physical and rheological properties of the modified asphalt were investigated through three indexes,temperature scanning,and low-temperature creep tests.Microscopic analysis was carried out using infrared spectrometer and a fluorescence microscope.The results revealed that as the nano-ZnO and nano-TiO2 content increased,the penetration of nano ZnO/TiO2/SBS composite modified asphalt reduced,while the softening point increased,and the high-temperature performance was markedly enhanced.In addition,the complex shear modulus and rutting factor of increased,while the phase angle substantially declined,indicating improved rutting resistance.The best performance was achieved at 3% ZnO and 4% TiO2 content.As the nano-modifier content elevated,the ductility of the ZnO/TiO2/SBS composite modified asphalt reduced,stiffness modulus rose,creep rate diminished,and the low-temperature performance slightly declined.Compared to base asphalt,new absorption peaks were observed in SBS modified asphalt,signifying a chemical modification by SBS.In contrast,the nano-ZnO/TiO2/SBS composite modified asphalt didn't exhibit any new absorption peaks,indicating that the modification by nano-ZnO and TiO2 belonged to physical modification.
关键词
道路工程
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改性沥青
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流变性能
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荧光显微镜
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红外光谱
Key words
road engineering
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modified asphalt
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rheological property
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fluorescence microscope
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infrared spectroscopy
纳米ZnO/TiO2与SBS复配改性沥青性能研究[J].
化工新型材料, 2025, 53(7): 278-284 DOI:10.19817/j.cnki.issn1006-3536.2025.07.033
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基金资助
国家自然科学基金青年项目(52208423);海南省交通运输厅科技项目(J-ZX-ZAX-02-2021)
