抽提回收过程对沥青老化程度评价的影响

对不同老化程度的沥青先采用三氯乙烯溶解, 再用真空旋转回收仪回收, 然后对沥青进行系统的试验, 获得不同老化程度的沥青在抽提回收前后的针入度、软化点、延度、粘度等常规指标以及动态剪切模量、相位角、低温弯曲蠕变劲度、低温抗拉强度等性能指标, 通过分析各项性能的变化研究抽提回收过程对沥青老化程度的影响规律。试验结果表明不同老化程度的沥青在经过抽提回收过程后, 其各项性能指标的变化均较小, 排除试验误差的影响, 采用真空旋转回收仪回收沥青时对沥青的老化程度的影响可以忽略, 因此可以用于评价沥青的老化程度。

Effect of extracting and reclaiming process on aging degree of asphalt

Different aged asphalts were dissolved in trichloroethylene, then were reclaimed with vacuum rotating reclaimer. Systematic test was made, the penetration, softening point, ductility, viscosity,dynamic shear modulus, phase angle, bending creep stiffness and tensile strength of the various aged asphalts and the corresponding reclaimed asphalts at low temperature were analyzed. [HJ] The influence of the extracting and reclaiming process on the aging degree of asphalt was concluded through analyzing the variances of various performance indices of different aged asphalts before and after the extracting and reclaiming process. The test results show that the variances of various performance indices are small for various aged asphalts after the extracting and reclaiming process. Considering the test error, it is concluded that the extracting and reclaiming process has little impact on the aging degree of asphalt binder by using revolution vacuum reclaimer, so the aging degree of asphalt binder can be evaluated using the asphalt reclaimed with revolution vacuum reclaimer. 16 tabs, 7 refs.