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首页> 外文期刊>American Journal of Traffic and Transportation Engineering >Influence of Recycling Agent on Surface Free Energy of Asphalt Cement
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Influence of Recycling Agent on Surface Free Energy of Asphalt Cement

机译：再生剂对沥青水泥表面自由能的影响

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Reliable surface free energy characterization is required in order to implement the suitable recycling agent into aged asphalt. One proven method to estimate asphalt surface free energy is to calculate it using contact angles measured with various liquids. The efficiency of recycling agent in terms of its impact on rheology and surface free energy of asphalt cement is vital in the decision of recycling aged asphalt concrete. In this investigation, asphalt cement of penetration grade 40-50 was subjected to aging using the thin film oven test. The aged and the control asphalt cement samples have been digested with various percentages of two type of polymer recycling agents (Polyethylene and crumb rubber). Recycled and control asphalt cement specimens were subjected to physical and rheological properties determination, while the surface free energy was determined using Wilhelmy plate and Sessile drop methods. It was observed that the surface free energy decreases after aging, while it increases after digestion with polymers. Digestion of aged asphalt cement with polyethylene was able to retain the original surface free energy of asphalt cement before aging, while a higher percentage of 1.5 polyethylene has improved the surface free energy beyond the requirements. Digestion of aged asphalt cement with crumb rubber was able to increase the surface free energy of asphalt cement by one-fold of that before aging when Wilhelmy plate method was implemented, while a higher percentage of 1.0 of crumb rubber has improved the surface free energy beyond the requirements.
机译：需要可靠的表面自由能表征，以便在老化的沥青中使用合适的回收剂。估计沥青表面自由能的一种行之有效的方法是使用各种液体测得的接触角来计算它。就回收剂对沥青水泥的流变学和表面自由能的影响而言，其效率对决定回收老化沥青混凝土至关重要。在该研究中，使用薄膜烘箱测试对渗透等级为40-50的沥青水泥进行老化。已老化和对照的沥青水泥样品已用不同百分比的两种类型的聚合物回收剂（聚乙烯和碎屑橡胶）进行了消解。对再生和对照的沥青水泥样品进行物理和流变性能测定，而表面自由能使用Wilhelmy平板法和Sessile滴落法测定。观察到，表面自由能在老化后降低，而在用聚合物消化后则增加。用聚乙烯消化老化的沥青水泥能够保留老化前沥青水泥的原始表面自由能，而更高比例的1.5聚乙烯可改善表面自由能，使其超出要求。使用Wilhelmy平板法消化老化的沥青胶泥后，沥青胶的表面自由能增加了老化前沥青胶的表面自由能的一倍，而较高比例的1.0的胶粒胶将表面自由能提高到要求。

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