Guo Fengqi, Shen Zhaolong, Jiang Liqiang, Long Qiuliang, Yu Yujie
School of Civil Engineering, Central South University, Changsha 410075, China.
National Engineering Research Center of High-Speed Railway Construction Technology, Central South University, Changsha 410083, China.
Polymers (Basel). 2024 Jul 6;16(13):1929. doi: 10.3390/polym16131929.
To enhance the properties of SBS and crumb rubber-modified asphalts, four different amounts (5%, 10%, 15%, and 20%) of castor oil were added to crumb rubber-modified asphalts to mitigate the adverse effects of high levels of fine crumb rubber particles on the aging resistance of SBS and crumb rubber-modified asphalt. Initially, a conventional test was conducted to assess the preliminary effects of bio-oil on the high-temperature and anti-aging properties of SBS and crumb rubber-modified asphalt. Subsequently, dynamic shear rheometer and bending beam rheometer tests were employed to evaluate the impact of bio-oil on the high- and low-temperature and anti-fatigue properties of SBS and crumb rubber-modified asphalt. Finally, fluorescence microscopy and Fourier transform infrared spectroscopy were used to examine the micro-dispersion state of the modifier and functional groups in bio-oil, SBS and crumb rubber composite-modified asphalts. The experimental results indicated that bio-oil increased the penetration of SBS and crumb rubber-modified asphalt, decreased the softening point and viscosity, and significantly improved its aging resistance. The addition of bio-oil enhanced the anti-fatigue properties of SBS and crumb rubber-modified asphalt. The optimal amount of added bio-oil was identified. Bio-oil also positively influenced the low-temperature properties of SBS and crumb rubber-modified asphalt. Although the addition of bio-oil had some adverse effects on the asphalt's high-temperature properties, the asphalt mixture modified with bio-oil, SBS, and crumb rubber still exhibited superior high-temperature properties compared to unmodified asphalt. Furthermore, fluorescence microscopy and Fourier transform infrared spectroscopy results demonstrated that bio-oil can be uniformly dispersed in asphalt, forming a more uniform cross-linked structure and thereby enhancing the aging resistance of SBS and crumb rubber-modified asphalt. The modification process involved the physical blending of bio-oil, SBS, and crumb rubber within the asphalt. Comprehensive research confirmed that the addition of bio-oil has a significant and positive role in enhancing the properties of SBS and crumb rubber-modified asphalt with different composite crumb rubber particle size ratios.
为提高SBS和胶粉改性沥青的性能，向胶粉改性沥青中添加了四种不同用量（5%、10%、15%和20%）的蓖麻油，以减轻大量细胶粉颗粒对SBS和胶粉改性沥青抗老化性能的不利影响。首先，进行了常规试验，以评估生物油对SBS和胶粉改性沥青高温和抗老化性能的初步影响。随后，采用动态剪切流变仪和弯曲梁流变仪试验，评估生物油对SBS和胶粉改性沥青高温、低温和抗疲劳性能的影响。最后，利用荧光显微镜和傅里叶变换红外光谱，研究生物油、SBS和胶粉复合改性沥青中改性剂的微观分散状态和官能团。实验结果表明，生物油提高了SBS和胶粉改性沥青的针入度，降低了软化点和粘度，并显著提高了其抗老化性能。生物油的添加增强了SBS和胶粉改性沥青的抗疲劳性能。确定了生物油的最佳添加量。生物油对SBS和胶粉改性沥青的低温性能也有积极影响。虽然生物油的添加对沥青的高温性能有一些不利影响，但与未改性沥青相比，用生物油、SBS和胶粉改性的沥青混合料仍具有优异的高温性能。此外，荧光显微镜和傅里叶变换红外光谱结果表明，生物油可以均匀地分散在沥青中，形成更均匀的交联结构，从而提高SBS和胶粉改性沥青的抗老化性能。改性过程涉及生物油、SBS和胶粉在沥青中的物理共混。综合研究证实，添加生物油对提高不同复合胶粉粒径比的SBS和胶粉改性沥青性能具有显著的积极作用。
