Zhang Wenxuan, Li Qiang, Wang Jiaqing, Meng Yuanpeng, Zhou Zhou
College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China.
School of Transportation, Southeast University, Nanjing 211189, China.
Materials (Basel). 2022 Apr 10;15(8):2778. doi: 10.3390/ma15082778.
In the rapid development of sponge city construction in China, porous asphalt pavement has been widely used. The high-viscosity modified asphalt used for porous asphalt pavements is utilised in a complex aging environment. In this study, infrared spectroscopy was used to test the changes in the functional groups of high-viscosity modified asphalt under the influence of ultraviolet radiation intensity, high temperature, and water corrosion conditions. The research results showed that under the influence of several environmental factors, the high-viscosity modified asphalt has no chemical reaction but does undergo physical changes. From the perspective of the functional group index, the carbonyl index is more suitable for evaluating the degree of ultraviolet aging, and the sulfoxide group index is more suitable for evaluating the effect of temperature on aging. The high-viscosity modified asphalt aging kinetic models, established with different functional group indexes as indicators, have different activation energies. The aging kinetic model established with the carbonyl index is more suitable for simulating traditional thermal-oxidative aging. This study provides a better plan to reveal the influence of different environmental factors on the aging performance of high-viscosity modified asphalt under complex environmental conditions.
在中国海绵城市建设的快速发展过程中，多孔沥青路面得到了广泛应用。用于多孔沥青路面的高粘度改性沥青是在复杂的老化环境中使用的。在本研究中，采用红外光谱法测试了高粘度改性沥青在紫外线辐射强度、高温和水腐蚀条件影响下官能团的变化。研究结果表明，在几种环境因素的影响下，高粘度改性沥青没有发生化学反应，但确实发生了物理变化。从官能团指标来看，羰基指数更适合评价紫外线老化程度，亚砜基指数更适合评价温度对老化的影响。以不同官能团指标为指标建立的高粘度改性沥青老化动力学模型具有不同的活化能。以羰基指数建立的老化动力学模型更适合模拟传统的热氧化老化。本研究为揭示不同环境因素对复杂环境条件下高粘度改性沥青老化性能的影响提供了更好的方案。
