RET复配SBR改性沥青流变特性及机理分析

为了解决沥青路面使用性能要求越来越高的问题,提出采用反应型聚合物沥青改性剂( reactive elastomeric terpolymer, RET)复配丁苯橡胶( styrene-butadiene rubber,SBR)的方案来获得综合性能优越且性价比较高的改性沥青。通过多应力蠕变恢复( MSCR)试验、小梁弯曲( BBR)试验、原子力显微镜和傅里叶红外光谱试验对不同RET掺量与SBR复配改性沥青的流变特性及其微观改性机理进行了研究。结果表明：掺加适量的RET后,RET、SBR和基质沥青相互发生化学交联反应,复合改性沥青中形成新的大分子物质和化学交联网络结构,显著提高了复合改性沥青的高温稳定性、低温抗裂性及其稳定性,可有效延缓沥青路面早期破坏的发生。

Rheological Characteristics of RET Compound SBR Modified Asphalt and Its Mechanism Analysis

In order to solve the problem of the increasingly high requirement of asphalt pavement performance, a solution of reactive elastomeric terpolymer ( RET) compounding styrene-butadiene rubber ( SBR ) was proposed to obtain modified asphalt with superior comprehensive and cost-effective performance. In this paper, the rheological properties and micro modification mechanism of different content of RET compound SBR modified asphalt binders were studied through MSCR test, BBR test, atomic force microscope and Fourier infrared spectrum experiment. The test results show that RET, SBR and base asphalt have interactive chemical reactions and form a new macromolecule material and chemical interactive network structure in compound modified asphalt, which significantly improves high temperature stability, crack resistance at low temperature and storage stability of the compound modified asphalt binders, as well delays the early diseases of asphalt pavement effectively.