基于活化温度的橡胶沥青流变及微观性能研究

Study on Rheological and Microscopic Properties of Rubberized Asphalt Based on Activation Temperature

为提高胶粉在沥青中的分散性和稳定性,探索不同活化温度下橡胶沥青的反应机理,采用布氏黏度及流变试验对不同活化温度下橡胶沥青的性能变化规律进行了研究,并结合荧光显微、红外光谱试验探究橡胶沥青微观结构变化。结果表明:荧光显微技术能清楚真实的观测到胶粉与沥青的交互状态;随着活化温度的升高,橡胶颗粒脱硫降解作用加剧,胶粉的交联结构在高温作用下不断被破坏,较低的活化温度下胶粉既能充分溶胀脱硫又可保留较好的力学性能;红外光谱测试证实,活化温度升高导致橡胶分子主链断裂,是胶粉在沥青中力学性能贡献下降的原因。

In order to improve the dispersion and stability of crumb rubber in asphalt,explore the reaction mechanism of different activation temperature of rubberized asphalt,the viscosity and rheological tests were conducted to study the performance of different activation temperature of rubberized asphalt.The microstructure changes of rubberized asphalt were investigated by fluorescence microscopy and infrared spectroscopy.The results showed that fluorescence microscopy can clearly and truly observe the interaction between rubber powder and asphalt;with the increase of activation temperature,the desulfurization and degradation of rubber particles become more and more serious,and the crosslinking structure of rubber powder is constantly destroyed by high temperature,at low activation temperature,the crumb rubber can not only fully swell the desulfurization,but also retain great mechanical properties;The infrared spectrum test proved that the activation temperature increased lead to the main chain of rubber broke,which is the reason for the decrease of the mechanical properties of rubber powder in asphalt.