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Effect of Gradation and Aged Binder Content of Reclaimed Asphalt Pavement (RAP) on Properties of Cold-Recycled Asphalt Mix

机译:再生沥青路面(RAP)对冷再生沥青混合性能的渐变和老化粘合剂含量的影响

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Cold-recycling of asphalt is an effective method enabling agencies to conserve valuable resources during rehabilitation of distressed roads. The objectives of this study are to improve the understanding regarding cold-recycled asphalt performance, investigate the impact of the Recycled Asphalt Pavement (RAP) gradation and RAP binder content on properties of the cold-recycled asphalt at given recycling agent and water content level, and evaluate the effect of recycling agent content and water content levels on the performance of Cold-Recycled asphalt. Various RAP sources with controlled gradations and five different asphalt content levels were mixed with emulsion at two different dosages and tested for performance properties; including Marshall stability and moisture susceptibility. The results show that at the early stages of curing the effect of gradation of the RAP is more important than the aged RAP binder content. Moreover, at this stage, increasing emulsion content improves wet stability and moisture susceptibility of the samples regardless of the RAP binder content and gradation of the cold-recycled mix.
机译:沥青的冷回收是一种有效的方法,使机构能够在苦恼道路康复期间巩固有价值的资源。本研究的目的是提高关于冷再生沥青绩效的理解,研究再生沥青路面(RAP)渐变和RAP粘合剂含量在给定的回收剂和水含量水平上对冷再循环沥青的性质的影响,并评价再循环剂含量和水含量水平对冷再生沥青性能的影响。具有受控灰泥的各种RAP源和五种不同的沥青含量水平与两种不同剂量的乳液混合,并测试性能;包括马歇尔稳定性和湿度耐湿性。结果表明,在固化的早期阶段,RAP渐变的效果比老年的RAP粘合剂含量更重要。此外,在该阶段,不管冷再生混合物的RAP粘合剂含量和渐变,增加乳液含量的增加提高了样品的湿稳定性和水分敏感性。

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