硅橡胶粉-SBS复配改性沥青路用性能流变学分析

为了研究硅橡胶粉(silicone rubber powder, SRP)-苯乙烯-丁二烯-苯乙烯(styrene-butadiene-styrene, SBS)复配改性沥青的高低温性能，复配了9种不同掺配比例的改性沥青。通过常规试验和沥青流变学试验的分析方法，定性定量地分析了硅橡胶粉、SBS掺量对于复配改性沥青黏弹性的影响。分析低温弯曲蠕变试验结果时，为了全面考虑劲度模量变化率和劲度模量，分析了二者的比值和低温连续分级温度，全面准确的分析了复配改性沥青的低温性能。利用多温度下的频率扫描试验，构建复配改性沥青的复数剪切模量的主曲线，在较宽频率范围内分析了不同配合比下复配改性沥青的性能差异，为更好地研究极端频率下的情况，引入改进型CAM(Christensen-Andersen-Marastean)模型，分析了复配改性沥青的高温性能。复配改性沥青的高低温性能良好，推荐使用的复配比例为17.5%SRP+4%SBS。

Rheological Study of Paving Performance of Silicone Rubber Powder -SBS Compound Modified Asphalt

In order to investigate the high and low temperature performance of silicone rubber powder (SRP)-SBS compound modified asphalt, we usednine kinds of modified asphalt with different mixing ratios compounded. By the conventional test and the analysis method of the asphalt rheology test, the effects of SRP and SBS content on the viscoelasticity of the compound modified asphalt were qualitatively and quantitatively analyzed by the conventional test and the analysis method of the asphalt rheology test. When we analyzed the results of low temperature bending beam rheometer test, in order to comprehensively consider the creep rate and the flexural creep, we used theratio of this two values and low grade temperature , and analyzed the low temperature performance of compound modified asphalt comprehensively and accurately. With the frequency sweep test at multiple temperatures, the master curve of the complex shear modulus of the compound modified asphaltwas constructed, and we also analyzed the performance differences of the compound modified asphalt under different mixing ratios in a wide frequency range. For studying the situation under extreme frequency, the improved CAM (Christensen-Andersen-Marastean) model was introduced to analyze the high temperature performance of compound modified asphalt. It shows that the compound modified asphalt has good high and low temperature performance, and the recommended compounding ratio is 17.5% SRP+4% SBS.