SBS改性沥青老化过程性能预测方程研究

Research on Prediction Equation of SBS Modified Asphalt Performance in Process of Aging

摘要:

建立SBS改性沥青在老化过程中性能衰变的非线性预测方程，通过薄膜烘箱试验验证了预测方程的可靠性，基于预测方程分析了SBS改性沥青老化过程中性能指标的变化速率。研究结果表明，非线性方程x（t）=（Lx0）/[1+（L-1）e-rt]可用以预测针入度、软化点、延度在SBS改性沥青老化过程中的变化规律；沥青针入度、软化点、延度的变化速率随老化时间的延长而逐渐下降，其中延度指标在老化初期的变化速率下降最快；可通过建立宏观性能指标与红外光谱a1700 /a1600的关系方程，进行SBS改性沥青老化程度的预测评估。

Abstract:

A nonlinear prediction equation of performance disintegration of SBS modified asphalt in the process of aging is established. The reliability of the prediction equation is validated by thin-film oven test. Based on the prediction equation, the change rate of performance indexes of SBS modified asphalt in the process of aging is analyzed. The research results show that the non-linear equation x(t)=(Lx0)/[1+(L-1)e-rt ] can be used to predict the change law of the penetration, softening point and ductility in the aging process of SBS modified asphalt. The change rate of penetration, softening point and ductility of SBS modified asphalt declines gradually with the lengthening of aging time, in which the change rate of ductility index decreases the most in the early aging period. The relationship equation between the macro performance index and the infrared spectrum a1 700/a1 600 can be established to predict and evaluate the aging degree of SBS modified asphalt.