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Evaluation of the properties and microstructure of SBS and EVA polymer modified bitumen

机译：SBS和EVA聚合物改性沥青的性能和微观结构评价

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This paper presents a laboratory study of modified bitumen containing styrene-butadiene-styrene (SBS) and ethylene vinyl acetate (EVA) copolymers. The polymer modified bitumen (PMB) samples have been prepared by means of multi purpose laboratory mixer depending on the type of the polymer. A 50/70 penetration grade base (unmodified) bitumen has been mixed with SBS and EVA polymers at different proportions. The properties and morphology of the samples have been determined and characterized using conventional and empirical test methods and fluorescence microscopy. The mechanical properties of the hot-mix asphalt (HMA) containing SBS and EVA PMBs have also been analyzed and compared with HMA incorporating base bitumen. The results indicated that, the morphology and properties of the modified bitumens, as well as the mechanical properties of polymer modified HMA are dependent on the type of polymer and polymer content. At low polymer contents, the samples revealed the existence of dispersed polymer particles in a continuous bitumen phase, whereas at high polymer contents a continuous polymer phase has been observed. Polymer modification improved the conventional properties of the base bitumen such as; penetration, softening point, temperature susceptibility, etc. It was also concluded that, the mechanical properties of HMA prepared with the SBS PMB samples such as Marshall stability were enhanced with the increasing polymer contents.
机译：本文介绍了含有苯乙烯-丁二烯-苯乙烯（SBS）和乙烯乙酸乙烯酯（EVA）共聚物的改性沥青的实验室研究。取决于聚合物的类型，已经通过多用途实验室混合器制备了聚合物改性的沥青（PMB）样品。将50/70渗透等级的基础沥青（未改性）与SBS和EVA聚合物以不同比例混合。已使用常规和经验测试方法以及荧光显微镜确定并表征了样品的特性和形态。还分析了含SBS和EVA PMB的热混沥青（HMA）的机械性能，并与掺有基础沥青的HMA进行了比较。结果表明，改性沥青的形态和性能，以及聚合物改性HMA的力学性能均取决于聚合物的类型和含量。在低聚合物含量下，样品显示在连续的沥青相中存在分散的聚合物颗粒，而在高聚合物含量下，观察到连续的聚合物相。聚合物改性改善了基础沥青的常规性能，例如；还得出结论，随着聚合物含量的增加，由SBS PMB样品制备的HMA的机械性能（如马歇尔稳定性）得到增强。

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