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首页> 美国卫生研究院文献>Materials >Recyclability of Asphalt Mixtures with Crumb Rubber Incorporated by Dry Process: A Laboratory Investigation
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Recyclability of Asphalt Mixtures with Crumb Rubber Incorporated by Dry Process: A Laboratory Investigation

机译：干法掺入的碎胶与沥青混合料的可回收性：室内研究

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摘要

Semi-Dense Asphalt (SDA) mixtures are nowadays recommended for the surface layer of low noise roads in urban areas due to their optimal functional characteristics. Moreover, the use of polymer-modified bitumen (PmB) in its design results in high mechanical performance. However, this type of highly modified bitumen implies significant economic and environmental disadvantages. The polymer modification increases the production cost, involves higher mixing temperatures, and makes the recycling process of the asphalt mixtures challenging. As a potential alternative to PmB in SDA mixtures, this experimental work analyses the dry process for the incorporation of crumb rubber (CR) from waste tires. Particularly, the main objective was to study the aging effect and the recyclability of asphalt mixtures prepared in the laboratory with two different types of CR. The volumetric properties and mechanical performance of the mixtures artificially aged and rejuvenated were evaluated. The results obtained show that mixtures with CR have adequate performance, being less susceptible to aging than a conventional polymer-modified mixture. Furthermore, the rheological response of asphalt binder samples recovered from the mixtures at different aging states was analyzed. It was observed that the effect of the rejuvenator depended on the CR type, but this fact did not negatively influence the performance of the recycled mixtures.
机译：如今，由于其最佳的功能特性，现建议在城市低噪声道路的表层使用半密实沥青（SDA）混合物。此外，在其设计中使用聚合物改性的沥青（Pm​​B）可获得较高的机械性能。然而，这种高度改性的沥青意味着显着的经济和环境劣势。聚合物改性增加了生产成本，涉及了更高的混合温度，并使沥青混合物的再循环过程具有挑战性。作为SDA混合物中PmB的潜在替代品，这项实验工作分析了将废轮胎中的生胶（CR）掺入的干法工艺。特别是，主要目的是研究在实验室中使用两种不同类型CR的沥青混合料的老化效果和可回收性。评价了人工老化和恢复活力的混合物的体积特性和机械性能。所得结果表明，具有CR的混合物具有足够的性能，比常规的聚合物改性的混合物更不易老化。此外，分析了在不同老化状态下从混合物中回收的沥青粘合剂样品的流变响应。观察到再生剂的效果取决于CR类型，但是这一事实并未对回收混合物的性能产生负面影响。

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