SBR/PP复合改性沥青流变性及相容性分析

Rheology and Compatibility Analysis of SBR/PP Composite Modified Asphalt

为分析复合聚合物改性沥青的流变性及相容性,将丁苯橡胶粉末与废旧聚丙烯颗粒共混制备SBR/PP颗粒,采用频率扫描试验、多应力蠕变恢复试验,研究了不同配比设计因素的SBR/PP颗粒对沥青流变性的影响,并基于Cole-Cole图和微观结构图像研究SBR/PP颗粒与沥青的相容特性。结果表明,橡塑比对改性沥青的流变性及相容性具有显著影响,复合颗粒中添加1.5%相容剂和0.5%抗氧剂后,SBR/PP颗粒在沥青相中分散得更加均匀,形成一种更理想的微观结构。通过SBR/PP颗粒的配比设计可以使改性沥青的弹性恢复率提高38%,不可恢复蠕变柔量、软化点差值分别降低54%、36%,并且Cole-Cole图的半圆弧形曲线能够体现SBR/PP改性沥青两相结构的相容特性,可作为评价聚合物改性沥青相容性的辅助指标。

In order to analysis the rheology and compatibility of composite polymer modified asphalt,SBR/PP thermoplastic elastomer particles were prepared by blending SBR powder with waste polypropylene particles.Select frequency scanning test and multi-stable creep recovery test,the effects of different proportions of SBR/PP thermoplastic elastomer for the rheological properties of asphalt stability were studied.Meanwhile,the compatibility of SBR/PP particles with asphalt was researched on Cole-Cole diagrams and microstructure images.The results showed that the rubber plastic ratio had a significant impact on the rheology and compatibility of modified asphalt.When 1.5%compatibilizer and 0.5%antioxidant were added to the composite particles,it could make SBR/PP particles more evenly dispersed in asphalt phase and form a more ideal microstructure.Through the design of SBR/PP particle ratio,the elastic recovery of modified asphalt could be increased by 38%,and the unrecoverable creep compliance and softening point difference could be reduced by 54%and 36%respectively,and the semicircular were curve of Cole-Cole diagram could reflect the compatibility characteristics of two-phase structure of SBR/PP modified asphalt,which could be used as an auxiliary index to evaluate the compatibility of polymer modified asphalt.