基于桥面铺装材料的橡胶沥青反应机理研究

选择不同的橡胶沥青工艺参数(7种反应时间、3种反应温度和4种胶粉掺量),采用动态剪切流变仪(DSR)以及凝胶渗透色谱(GPC),以研究不同反应参数对橡胶沥青性能的影响.试验结果表明:反应时间和反应温度是影响橡胶沥青性能的最主要因素;反应时间越长,温度越高,橡胶沥青失效温度以及粘度都较高;不同反应参数对基质沥青性能的影响不明显;胶粉改性剂(CRM)掺量对粘度计车辙因子(G*/sinδ)具有显著影响;CRM掺量越高,沥青中大分子(LMS)越高,这主要是由于沥青中小粒径分子被CRM吸收.

Reaction Mechanism of Rubber AsphaltBased on Deck Pavement Material

The interaction effects of CRM binders as a function of various reaction parameters were investigated.Dynamic shear rheometer (DSR) and gel permeation chromatography (GPC) were used in the study.CRM binders were produced using seven blending time, three blending temperatures, and four rubber contents.The results show that the interaction time and interaction temperature for CRM binders have significant effect on the binder properties.The longer time and higher temperature for interaction of CRM binders resulted in an increase in the high failure temperature and the viscosity.Different blending treatments have little change of the binder properties.The CRM percentage influence is statistically significant on the viscosity and G*/sinδ values.Also, the asphalt binder with higher CRM percentage shows a higher large molecular size (LMS) value, and the increase in CRM percentage is considered to result in the additional loss of the low molecular weight in the asphalt binder to the CRM.