A lignocellulosic material, like ethylcellulose (EC), is assessed for bitumen modification, as a more sustainable alternative to polymers derived from non-renewable sources. However, ethylcellulose alone hardly enhances bitumen performance. This work studies novel bituminous binders prepared with ethylcellulose powder and polyphosphoric acid (PPA) as bitumen modifiers for paving applications. Rheological tests demonstrated that the addition of 0.5 wt% PPA to a binder containing 5 wt% EC, along with a thermal curing, leads to binders with improved rutting resistance at high in-service temperatures, compared to binders prepared solely with EC or PPA. TLC–FID chromatography, FTIR spectroscopy and modulated DSC were conducted on binders to shed some light on modification route. From them, it is possible to state that the rheological enhancement is related to a change in SARAs fractions (i.e., binder colloidal index), derived from the asphaltenes disaggregation and formation of new phosphorylated adducts. Therefore, the use of ethylcellulose as lignocellulosic raw material seems to be a promising alternative to design bituminous binders for paving applications with enhanced rheological properties at high in-service temperatures.

中文翻译：

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用于铺路应用的沥青的协同乙基纤维素/多磷酸改性

木质纤维素材料，如乙基纤维素 (EC)，被评估用于沥青改性，作为源自不可再生来源的聚合物的更可持续的替代品。然而，单独的乙基纤维素几乎不能提高沥青的性能。这项工作研究了用乙基纤维素粉末和多聚磷酸 (PPA) 制备的新型沥青粘合剂作为铺路应用的沥青改性剂。流变学测试表明，与仅用 EC 或 PPA 制备的粘合剂相比，将 0.5 重量％的 PPA 添加到含有 5 重量％EC 的粘合剂中，并进行热固化，可以提高粘合剂在高使用温度下的抗车辙性。对粘合剂进行了 TLC-FID 色谱、FTIR 光谱和调制 DSC，以揭示改性途径。从他们，可以说流变学增强与 SARAs 分数（即粘合剂胶体指数）的变化有关，该分数源自沥青质解聚和新磷酸化加合物的形成。因此，使用乙基纤维素作为木质纤维素原料似乎是设计沥青粘合剂的一种有前途的替代方案，用于在高使用温度下具有增强的流变性能的铺路应用。