Abstract Low temperature rheological properties of asphalt mixtures containing different recycled asphalt materials
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Low temperature rheological properties of asphalt mixtures containing different recycled asphalt materials

机译：含不同再生沥青材料的沥青混合料的低温流变特性

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Abstract Reclaimed Asphalt Pavement (RAP) and Recycled Asphalt Shingles (RAS) are valuable materials commonly reused in asphalt mixtures due to their economic and environmental benefits. However, the aged binder contained in these materials may negatively affect the low temperature performance of asphalt mixtures. In this paper, the effect of RAP and RAS on low temperature properties of asphalt mixtures is investigated through Bending Beam Rheometer (BBR) tests and rheological modeling. First, a set of fourteen asphalt mixtures containing RAP and RAS is prepared and creep stiffness and m-value are experimentally measured. Then, thermal stress is calculated and graphically and statistically compared. The Huet model and the Shift-Homothety-Shift in time-Shift (SHStS) transformation, developed at the école Nationale des Travaux Publics de l'état (ENTPE), are used to back calculate the asphalt binder creep stiffness from mixture experimental data. Finally, the model predictions are compared to the creep stiffness of the asphalt binders extracted from each mixture, and the results are analyzed and discussed. It is found that an addition of RAP and RAS beyond 15% and 3%, respectively, significantly change the low temperature properties of asphalt mixture. Differences between back-calculated results and experimental data suggest that blending between new and old binder occurs only partially. Based on the recent finding on diffusion studies, this effect may be associated to mixing and blending processes, to the effective contact between virgin and recycled materials and to the variation of the total virgin-recycled thickness of the binder film which may significantly influence the diffusion process.
机译： 摘要 再生沥青路面（RAP）和再生沥青瓦（RAS）是有价值的材料，由于其经济性和实用性而常用于沥青混合料中环境效益。但是，这些材料中包含的老化粘合剂可能会对沥青混合物的低温性能产生负面影响。本文通过弯曲梁流变仪（BBR）测试和流变模型研究了RAP和RAS对沥青混合料低温性能的影响。首先，制备了一组包含RAP和RAS的十四种沥青混合料，并通过实验测量了蠕变刚度和 m 值。然后，计算热应力并进行图形和统计比较。由法国国家交通大学（ENTPE）开发的Huet模型和时移的Shift-Homothety-Shift（SHStS）转换用于从混合料实验数据反算沥青粘结剂的蠕变刚度。最后，将模型预测与从每种混合物中提取的沥青粘合剂的蠕变刚度进行比较，并对结果进行分析和讨论。发现分别添加超过15％和3％的RAP和RAS显着改变了沥青混合物的低温性能。反算结果与实验数据之间的差异表明，新旧粘合剂之间的混合仅部分发生。根据有关扩散研究的最新发现，这种影响可能与混合和共混过程，原始材料与回收材料之间的有效接触以及粘合剂膜的总原始回收厚度的变化有关，这可能会严重影响扩散。进程。

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