SBS改性沥青的老化方程及应用

Aging Equation of SBS Modified Asphalt and Its Application

建立起SBS改性沥青的非线性微分老化方程,应用微分方程探索SBS改性沥青的老化规律,并计算任意时刻的沥青老化量和老化速率;测定SBS改性沥青在不同RTFOT老化时间下的针入度、5℃延度、软化点、135℃粘度指标,得出各指标的老化参数及老化方程,通过分析实验值与老化方程计算值间的相关性,验证非线性老化方程的可靠性;对老化方程的潜在应用方向进行了初探。研究结果表明:非线性老化方程能精确地预测SBS改性沥青的针入度、软化点、粘度、延度的老化规律,能计算任意时刻各指标的老化量及老化速率;老化速率方程计算显示,沥青的老化速率在开始时刻最大,后期随老化时间的延长而逐渐变小,与老化的实际情况吻合;沥青老化方程可用于沥青抗老化性能评价、耐久性评价、沥青路面开裂预测、沥青路面再生决策。

This paper sets up a nonlinear differential aging equation of SBS modified asphalt and explores the aging law of it with the help of nonlinear differential equation.The author of the paper has calculated the aging quantity and rate of the asphalt at the random time,measured the indexes of its penetration,ductility at 5 ℃,softening point and viscosity at 135 ℃ at different aging time in RTFOT,and obtained the aging parameters and equation of all the indexes.Through the analysis for the relativity between the tested values and the aging equation values,the author proves the reliability of the nonlinear aging equation and examines the potential application of it.The research results show that the nonlinear aging equation can predict the law of the penetration,ductility,softening point and viscosity,and obtain the aging quantity and rate of all the indexes at the random time.The calculated results from the aging rate equation indicate that the aging rate of the asphalt shows its maximum value at the beginning,but becomes smaller and smaller as the time going,which meets with the everyday performances.This aging equation can be used to assess the anti-aging performances and durability of asphalt,predict pavement cracking and determine the pavement regeneration.