仓储式橡胶沥青零剪切粘度的确定

首先，运用低频率震荡测试法对基质沥青、仓储式橡胶沥青及其RTFOT短期老化产物进行了测试；其次，运用图形外延法、Cross模型拟合法及Carreau模型拟合法对各材料的零剪切粘度进行了测定；最后，对基质沥青进行了蠕变恢复试验，通过蠕变阶段和恢复阶段沥青的应变响应的计算，得出了静态施载作用下基质沥青的零剪切粘度。研究表明：基质沥青在低频震荡测试中，随着频率的降低会进入粘度稳定阶段，可以用图形外延法得到零剪切粘度；然而对于RTFOT老化后的橡胶沥青，在测试条件下未进入粘度稳定阶段，无法通过图形外延法测算零剪切粘度；由Cross模型拟合的结果都大于同样材料Carreau模型拟合结果。

The Determines for the Warehouse Type Rubber Zero Shear Viscosity of Asphalt

First of all, using the low-frequency vibration test on asphalt, rubber asphalt warehouse and their RTFOT Short-term aging products have been tested ;Secondly, application of graphic epitaxial method, Cross model and Carreau model fitting for various materials Zero shear viscosity were determined;finally, the creep of matrix asphalt recovery test, creep through phase and recovery phase of asphalt strain response calculation, obtained under the action of static Shi Zai matrix zero shear viscosity of asphalt.The study shows that: Matrix asphalt in low frequency vibration test, with the lower frequency will enter the viscosity stable stage, can use graphical extrapolation method to get the zero shear viscosity; however for RTFOT after aging of asphalt rubber, in a test condition did not enter the viscosity stability phase, not through a graphical extension method to calculate the zero shear viscosity; by Cross model fitting results greater than the same material Carreau model fitting results.