废胶粉和塑料(EVA)双改性沥青性能研究

Performance of Crumb Rubber Modifier and Plastic EVA Hybrid Modified Binders

为提高废胶粉改性沥青的高低温性能和抗老化性能,选用塑料EVA与废胶粉改性剂进行复合改性,并分别使用双龙和壳牌2种不同基质沥青,在保持废胶粉掺量8%的情况下制备不同EVA掺量的复合改性沥青。对不同双改性沥青进行力学和路用性能(沥青3大指标、动态剪切流变仪和弯曲小梁蠕变)研究。结果表明:①EVA可以极大改善废胶粉改性沥青的高温稳定性和低温开裂性能。②动态剪切流变试验表明EVA有效改善了沥青抗热氧老化性能。③红外光谱(FT-IR)分析官能团证实废胶粉/塑料EVA吸收芳香分从而形成稳定的双改性沥青的胶体结构。④该系列样品的最佳组合为8%废胶粉+4%EVA,且壳牌改性沥青的改性效果优于双龙。

In order to improve the performance at both high and low temperatures and anti-aging properties of Crumb Rubber Modified asphalt binders(CRM binders),plastic EVA was added into the CRM binders for a hybrid modification.The hybrid modified binders with different EVA contents were prepared with a base binder of either Shuanglong or Shell,respectively,while the CRM was a constant of 8%.The bending beam rheological(BBR)test and the conventional physical property tests showed that EVA can greatly improve the high temperature stability and low temperature cracking performance of CRM modified binders.Dynamic shear rheological(DSR)tests on RTFO residuals indicated an obvious better performance.FT-IR tests confirmed that CRM and plastic EVA absorbed the aromatics in the asphalt to form a stable colloidal structure.Finally,an optimum combination of the samples was 8%CRM and 4%EVA hybrid,modified asphalt of Shell had the best performance.