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Effects of Wax-Impregnated Nanozeolites on Bitumen’s Thermomechanical Properties
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-09-18 , DOI: 10.1021/acssuschemeng.0c05464 Alireza Samieadel 1 , Shaojiang Chen 2 , David Ciota 2 , Dong-Kyun Seo 2 , Kamil E. Kaloush 1 , Elham H. Fini 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-09-18 , DOI: 10.1021/acssuschemeng.0c05464 Alireza Samieadel 1 , Shaojiang Chen 2 , David Ciota 2 , Dong-Kyun Seo 2 , Kamil E. Kaloush 1 , Elham H. Fini 1
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This study presents a new carrier for wax-based additives used in bitumen; the new carrier alleviates wax crystallization while improving bitumen’s cohesion, adhesion, and elastic properties. The abovementioned wax carrier is a newly developed nanozeolite, which is impregnated with paraffin wax to form a hybrid additive referred to as Winz. Bitumen containing Winz showed an improved resistance to low-temperature cracking, which can be attributed to reduced wax crystallization when wax dispersed via nanozeolite. In addition, nanozeolite was found to adsorb acidic compounds of bitumen upon its release of wax. Our molecular modeling showed that while wax interacts with nanozeolite in the absence of acid, upon introduction of acid, wax molecules are replaced by acid molecules on the nanozeolite surface. Adsorption of acids to the nanozeolite surface was also evidenced in the significant change of shear-thinning behavior of bitumen doped with Winz when bitumen was exposed to water. Hydrolysis of acidic compounds at the surface of nanozeolite caused a 42% reduction in the shear-thinning rate (going from 3.25 to 1.89) after water conditioning. This in turn shows that bitumen acids were adsorbed to Winz and detracted from the interface of bitumen with stones. Therefore, Winz can be a promising candidate to promote sustainability by enhancing the durability of bituminous composites via reducing bitumen’s wax crystallization and bitumen’s acid accumulation at the stone interface. The study outcomes provide insights to synthesize multifunctional carriers for bitumen’s wax-based additives to enhance their dispersion and effectiveness.
中文翻译：
蜡浸渍纳米沸石对沥青热机械性能的影响
这项研究提出了一种用于沥青的蜡基添加剂的新载体。新的载体减轻了蜡的结晶，同时改善了沥青的内聚力，附着力和弹性。上述蜡载体是新开发的纳米沸石，其用石蜡浸渍以形成称为Winz的杂化添加剂。含Winz的沥青显示出更高的抗低温开裂性，这可以归因于当蜡通过纳米沸石分散时蜡结晶减少。另外，发现纳米沸石在释放蜡时会吸附沥青的酸性化合物。我们的分子模型表明，尽管蜡在不存在酸的情况下与纳米沸石相互作用，但在引入酸后，蜡分子被纳米沸石表面上的酸分子取代。当沥青暴露在水中时，掺Winz的沥青的剪切稀化行为的显着变化也证明了酸在纳米沸石表面的吸附。水处理后，纳米沸石表面酸性化合物的水解导致剪切稀化速率降低了42％（从3.25降低到1.89）。这又表明沥青酸被Winz吸附，并从沥青与石头的界面中分离出来。因此，Winz可以通过减少沥青在石界面处的蜡结晶和沥青酸的积累来增强沥青复合材料的耐久性，从而成为可持续发展的有希望的候选人。研究结果为合成沥青蜡基添加剂的多功能载体提供了见识，以增强其分散性和有效性。
更新日期：2020-10-12
中文翻译：
蜡浸渍纳米沸石对沥青热机械性能的影响
这项研究提出了一种用于沥青的蜡基添加剂的新载体。新的载体减轻了蜡的结晶，同时改善了沥青的内聚力，附着力和弹性。上述蜡载体是新开发的纳米沸石，其用石蜡浸渍以形成称为Winz的杂化添加剂。含Winz的沥青显示出更高的抗低温开裂性，这可以归因于当蜡通过纳米沸石分散时蜡结晶减少。另外，发现纳米沸石在释放蜡时会吸附沥青的酸性化合物。我们的分子模型表明，尽管蜡在不存在酸的情况下与纳米沸石相互作用，但在引入酸后，蜡分子被纳米沸石表面上的酸分子取代。当沥青暴露在水中时，掺Winz的沥青的剪切稀化行为的显着变化也证明了酸在纳米沸石表面的吸附。水处理后，纳米沸石表面酸性化合物的水解导致剪切稀化速率降低了42％（从3.25降低到1.89）。这又表明沥青酸被Winz吸附，并从沥青与石头的界面中分离出来。因此，Winz可以通过减少沥青在石界面处的蜡结晶和沥青酸的积累来增强沥青复合材料的耐久性，从而成为可持续发展的有希望的候选人。研究结果为合成沥青蜡基添加剂的多功能载体提供了见识，以增强其分散性和有效性。
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