基于动态频率扫描的SBS改性沥青老化性能分析

Analysis on Aging Performance of SBS Modified Asphalt Based on Dynamic Frequency Scan

为了研究SBS改性沥青的老化特性,应用动态频率扫描试验,对不同老化程度下SBS掺量分别为0%、3%、6%的改性沥青进行了多个温度条件下的频率扫描,通过对主曲线的分析,并引入玻璃态转变温度来评价改性沥青与基质沥青老化前后的性能特点,最后利用CA模型拟合主曲线。研究表明:改性剂的加入改善了基质沥青的高、低温性能,同时减缓老化速率;老化使沥青低温抗裂性能大幅下降,但高温温度性能却有一定提高;玻璃态转变温度和CA模型对于评价沥青结合料性能均有较好的适用性。

In order to study the aging characteristics of SBS modified asphalt, the dynamic frequency scanning test is used to frequently scan the modified asphalts with SBS contents of 0%, 3% and 6% respectively in the different aging degrees under the conditions of many temperatures. According to the analysis of the main curve,the glassy state of transformation temperature is introduced to assess the performance features of modified asphalt and matrix asphalt before and after aging, and the CA model is used to fit the main curve. The study shows that the addition of modifying agent improves the high and low temperature features of matrix asphalt, and also slows down the aging velocity. The aging makes the low-temperature anti-cracking performance of asphalt sharply decreased, but the high-temperature performance can a certain increase. The glassy state of transformation temperature and CA model are all more applicable for assessing the performance of asphalt binder.