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动态剪切流变仪不仅可以用来对沥青的路用性能进行分级,也可以在大温度范围内测定沥青的性能。采用动态剪切流变仪对沥青材料进行试验时,不同平行板在相同试验条件下对同种试样进行试验的数据不一定相同,并且不同半径的平行板有各自的温度实用范围,本文从时间温度等效原理入手,采用数据分析软件,对采用不同平行板进行试验得到的频率-模量曲线进行拟合,从而得到模量主曲线,确定出不同平行板的试验结果在一定频率范围内的互用范围。采用WLF公式计算出不同温度条件下对应的基准温度TS值,研究结果表明:在沥青模量一定的范围内,8 mm平行板与25 mm平行板相比更适合20℃以下的动态剪切试验,而在20℃以上,二者可以互用,这对于以后的研究提供了不同条件下选择仪器的一个参考。
Dynamic shear rheometer can not only be used to grade asphalt road performance, but also in the large temperature range of asphalt performance. When dynamic asphalt rheometer is used to test asphalt materials, the data of different parallel plates under the same test conditions are not necessarily the same for the same kind of samples, and the parallel plates with different radiuses have their own practical temperature range. Time temperature equivalent principle, the data analysis software was used to fit the frequency-modulus curve obtained from experiments with different parallel plates to get the modulus main curve, and to determine the test results of different parallel plates in a certain frequency range Interoperability range. WLF formula was used to calculate the corresponding temperature TS under different temperature conditions. The results show that the 8 mm parallel plate is more suitable for the dynamic shear test below 20 ℃ than the 25 mm parallel plate in a certain range of asphalt modulus , While above 20 ℃, the two can be interoperable, which provides a reference for selecting instruments under different conditions for future research.