Three kinds of asphalt with different penetrations were selected in this study.The viscosity-temperature curves were measured for the asphalt-rubber system,and the infrared spectrum analysis was used to characterize the asphalt samples.The reaction process and mechanism of asphalt-rubber system was investigated through the variation of the viscositytemperature curves and changes of the functional group in different reaction conditions.The results show that the reaction of crumb rubber modified asphalt is closely related to the type of asphalt,reaction time and temperature.When the temperature is higher,the reaction rate of swelling and degradation process will be improved.And when the penetration is higher,the viscosity change of crumb rubber modified asphalt will be larger.The spectroscopic analysis displays that no new functional groups have been produced in this reaction process,and the change of its viscosity is closely related to the swelling and degradation process.In practice,the viscosity-temperature property of crumb rubber modified asphalt can be controlled by the reaction temperature and reaction time.%对3种不同基质沥青原料,分别测定不同反应温度下橡胶粉-沥青体系的黏温曲线,并对特征样品进行红外光谱分析;通过分析橡胶粉改性沥青黏温曲线随反应条件的变化,以及反应过程中官能团的改变,探讨橡胶粉与沥青体系反应规律和作用机制.结果表明:橡胶粉改性沥青反应过程与沥青介质、反应温度和反应时间紧密相关;反应温度越高,溶胀和降解的速度越快;沥青针入度越高,橡胶粉改性沥青黏度变化越大;反应过程并没有生成新的官能团,产品黏度变化主要是受橡胶粉的溶胀和降解过程影响;在实际生产中,橡胶粉改性沥青黏温性能可以通过反应温度和反应时间进行控制.
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