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Viscous properties and microstructure of recycled eva modified bitumen

机译：再生EVA改性沥青的黏性和微观结构

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摘要

This paper deals with the viscous properties of recycled-polymer modified bitumens (PMBs) in a wide range of temperatures. With this aim, two different penetration grade bitumens (60/70 and 150/200) and recycled EVA copolymer (EVA_R) from agriculture films were processed in an open reactor using a four blade propeller. Polymer concentration ranged from 0 to 9 wt%. Viscous flow and DSC measurements, from 5 to 165℃, and optical microscopy, at room temperature, were performed on the samples. From the experimental results obtained, we may conclude that the viscous properties of bitumen, at high temperature, are improved by adding recycled EVA copolymer in amounts that depend on bitumen penetration grade. Moreover, significant microstructural changes, related to the development of a polymer-rich phase, tend to occur in the bitumen as polymer concentration increased. These changes in microstructure have a significant influence on the flow behaviour of the binder and on its in-service performance. As a consequence, the use of recycled EVA in PMBs can be considered a suitable alternative from both environmental and economical points of view.
机译：本文探讨了在各种温度下，再生聚合物改性沥青（PMB）的粘性。为此目的，使用四叶片螺旋桨在开放式反应器中加工了两种不同的渗透级沥青（60/70和150/200）和来自农业薄膜的再生EVA共聚物（EVA_R）。聚合物浓度为0至9重量％。样品在5至165℃下进行粘性流动和DSC测量，并在室温下进行光学显微镜检查。从获得的实验结果，我们可以得出结论，通过添加取决于沥青渗透等级的量的再生EVA共聚物，可以改善高温下沥青的粘性。此外，随着聚合物浓度的增加，与富聚合物相的发展相关的重大微观结构变化往往会在沥青中发生。微观结构的这些变化对粘合剂的流动行为及其使用性能有重大影响。因此，从环境和经济角度来看，在PMB中使用回收的EVA均被认为是合适的选择。

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