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针对改性乳化沥青破乳时间难以量化评价的不足,采用不同类型的细集料与改性乳化沥青制备了改性乳化沥青胶浆,运用龚帕斯模型分析了其黏度随时间的变化规律,并建立了准确评价改性乳化沥青破乳的数学模型。研究结果表明:改性乳化沥青胶浆初始黏度较低,随沥青破乳时间的增大而不断增大,最后趋于稳定;当集料粒径相同时,花岗岩改性乳化沥青胶浆的黏度最大,玄武岩胶浆的黏度次之,而石灰岩胶浆的黏度最小,但黏度增长速率基本相同,符合生长曲线的特征;龚帕斯模型可以较好地反映胶浆黏度随时间的变化规律,计算值与实测值的最大相对误差小于15%;当根据龚帕斯模型建立的沥青破乳评价指标值为0.97~1.00时,胶浆黏度变化趋于平稳,此时改性乳化沥青已经完全破乳;反之,也可以根据黏度试验结果计算龚帕斯模型参数,预测改性乳化沥青破乳时间。
In view of the lack of quantitative evaluation of the demulsification time of modified emulsified asphalt, the modified emulsified asphalt mortar was prepared by using different types of fine aggregate and modified emulsified asphalt, and the viscosity of the modified emulsified asphalt was analyzed by using the Gompers model. And established a mathematical model to accurately evaluate the demulsification of modified emulsified asphalt. The results show that the initial viscosity of the modified emulsified asphalt mortar is lower, with the increase of the breaking time of asphalt, the viscosity of the modified emulsified asphalt mortar tends to be stable. Finally, when the aggregate size is the same, the viscosity of the modified emulsified asphalt mortar The viscosity of limestone mortar is the smallest, but the viscosity growth rate is basically the same, which accords with the characteristics of growth curve. The gypsum model can well reflect the variation of viscosity of mortar with time, The maximum relative error between the measured value and the measured value is less than 15%. When the evaluation index of asphalt demulsification established by Gompers’ model is 0.97-1.00, the change of the viscosity of the mortar tends to be stable. At this time, the modified emulsified asphalt has completely demulsified ; Conversely, the parameters of the Gompers model can also be calculated according to the viscosity test results to predict the demulsification time of the modified emulsified asphalt.