SBS聚合物改性沥青热储存稳定性取样方法和评价指标

Sampling method and evaluation factor for investigating the hot storage stability of SBS polymer modified asphalt

针对现行规范中离析试验评价聚合物改性沥青热储存稳定性的缺点,结合工程实际,设计开发了筒法离析试验.通过对不同种类、不同剂量的SBS聚合物改性沥青进行不同时刻的筒法离析试验,并对离析后上、下部沥青进行了软化点试验、动态剪切流变(DSR)试验和凝胶渗透色谱(GPC)试验,首次提出了采用离析率Rz+1作为SBS聚合物改性沥青热储存稳定性的评价指标.结果表明,筒法离析试验是一种更合理、更有效的评价方法.

Based on the disadvantages of the current method for investigating the hot storage stability of SBS polymer modified asphalt in the current specifications, and combined with technical experiences, a new method called separation test in canister for evaluating the hot storage stability of SBS polymer modified asphalt is developed. Using methods of a softening point test, Dynamic Shear Rheometer（DSR） and Gel Permeation Chromatography（GPC） to investigate the upper and the bottom asphalt sample from the canister, a ratio of separation, Rz＋1 ,is first put forward to evaluate the hot storage stability of SBS polymer modified asphalt. The results show that the new method called separation test in canister is a more suitable and effective method for evaluating the hot storage stability of SBS modified asphalt.