He Rui, Wu Shuhua, Wang Xiaofeng, Wang Zhenjun, Chen Huaxin
School of Materials Science and Engineering, Chang'an University, Xi'an 710061, Shaanxi, China.
Engineering Research Center of Transportation Materials, Ministry of Education, Chang'an University, Xi'an 710064, Shaanxi, China.
Materials (Basel). 2018 Oct 30;11(11):2136. doi: 10.3390/ma11112136.
Temperature sensitivity characteristics of bitumen can be evidently influenced by modifier types and natural aging processes. Many types of modifiers have been used to improve the temperature sensitivity performance of bitumen, but their effects are different. Therefore, different bitumen specimens as well as SBS/CRP (Styrene-butadiene-styrene polymer/crumb rubber powder)-modified bitumen were prepared and the temperature sensitivity characteristics of bitumen after different aging processes were analyzed in this study. A dynamic rheological property test and performance test at low temperature were carried out to analyze temperature sensitivity and low temperature rheological properties of bitumen. An infrared spectrum test was adopted to study the effect of functional groups under different aging process on the properties of bitumen. The relationship between macroscopic properties and microstructures of bitumen was analyzed. The results show that SBS/CRP-modified bitumen has a strong anti-aging ability in that its flexibility and structure remain in a good condition after long-term aging. The aging process has no significant effect on SBS/CRP-modified bitumen. SBS/CRP-modified bitumen has an excellent low-temperature relaxation ability and low-temperature crack resistance. In contrast to original bitumen and SBS-modified bitumen, the temperature sensitivity performance of SBS/CRP-modified bitumen is evidently enhanced. The physical blending effect is dominant in the bitumen modified process and there is no evident chemical reaction between bitumen and crumb rubber powder. SBS/CRP-modified bitumen is recommended for wide use in plateau areas with ultraviolet and cold surroundings.
沥青的温度敏感性特征会受到改性剂类型和自然老化过程的显著影响。许多类型的改性剂已被用于改善沥青的温度敏感性性能，但它们的效果各不相同。因此，本研究制备了不同的沥青试样以及SBS/CRP（苯乙烯-丁二烯-苯乙烯聚合物/胶粉）改性沥青，并分析了不同老化过程后沥青的温度敏感性特征。进行了动态流变性能试验和低温性能试验，以分析沥青的温度敏感性和低温流变性能。采用红外光谱试验研究不同老化过程中官能团对沥青性能的影响。分析了沥青宏观性能与微观结构之间的关系。结果表明，SBS/CRP改性沥青具有较强的抗老化能力，在长期老化后其柔韧性和结构仍保持良好状态。老化过程对SBS/CRP改性沥青没有显著影响。SBS/CRP改性沥青具有优异的低温松弛能力和低温抗裂性。与原始沥青和SBS改性沥青相比，SBS/CRP改性沥青的温度敏感性性能明显增强。在沥青改性过程中物理共混效应占主导，沥青与胶粉之间没有明显的化学反应。建议SBS/CRP改性沥青在紫外线强且寒冷的高原地区广泛使用。
