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Rheological study of asphalt binders with a wax-based Warm Mix Additive and its relationships to mix compaction and rutting.

机译：含蜡基温混合添加剂的沥青粘合剂的流变学研究及其与混合压实和车辙的关系。

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摘要

Although the energy saving Warm Mix Asphalt (WMA) technology that produces asphalt mixes at lower temperatures are around for about a decade, there still exist some concerns that are hindering its wide spread implementation. The overall objective of this study is to investigate if the viscosity reductions at higher temperatures have any impacts on asphalt mix compaction and rutting performances. This study reveals that there exists a critical temperature for each asphalt binder below which viscosity will increase with addition of Sasobit®. Therefore, compaction below the critical temperature can negatively impact density.;For PG 64-22, the critical temperature is 104 °C and for PG 76-22M, the critical temperature is about 101 °C. Another significant finding of this study is that with the addition of Sasobit®, asphalt binders become a shear-thinning liquid even at compaction temperature ranges. The shear rate dependency increases with an increase in percent of Sasobit ®. This indicates if the actual shear rate during the compaction process is higher than 6.8 s-1, then the currently recommended viscosity as well as temperature is overestimated and compaction temperature can be reduced. On the other hand, if the actual shear rate during the compaction process is lower than 6.8 s-1, then the currently recommended viscosity as well as temperature is underestimated and a higher compaction temperature should be used.;This study further reveals that an optimum amount of Sasobit® exists between 2% and 4% based on phase angle and non-recoverable creep compliance analyses of PG 64-22 and based on percent recovery of PG 76-22M. Currently used rutting factor G*/sinδ fails to indicate any optimum amount. Phase angle values suggest if rutting is performed at one grading higher temperature, an overdose of Sasobit® will increase rutting potential. Creep and recovery tests at equal-stiffness temperature indicate that addition of Sasobit® increases rutting resistance at lower stress while it increases rutting potential at higher stress. APA rut depths indicate that Sasobit® mixes prepared at WMA temperatures performed better than HMA without Sasobit ®. However, from aging evaluation of extracted asphalt binders it was revealed that reduced production temperatures reduces aging and may increase rutting susceptibility. Finally, from an exploratory study it was concluded that wax modified asphalt binders may be differentiated by its morphology using an AFM. Overall, this study provides fundamental findings with respect to rheology and performance which will help implement warm mix asphalt in the U.S.
机译：尽管在较低温度下生产沥青混合料的节能节能沥青混合料（WMA）技术已经使用了大约十年，但仍然存在一些担忧，阻碍了其广泛应用。这项研究的总体目标是研究高温下的粘度降低是否对沥青混合料的压实和车辙性能产生任何影响。这项研究表明，每种沥青粘合剂都存在一个临界温度，在该温度以下，添加Sasobit®会使粘度增加。因此，低于临界温度的压实会对密度产生负面影响。对于PG 64-22，临界温度为104°C，对于PG 76-22M，临界温度约为101°C。这项研究的另一个重要发现是，通过添加Sasobit®，即使在压实温度范围内，沥青粘合剂也能成为剪切稀化的液体。剪切速率依赖性随Sasobit®百分比的增加而增加。这表明如果压实过程中的实际剪切速率高于6.8 s-1，则当前推荐的粘度以及温度都被高估了，可以降低压实温度。另一方面，如果压实过程中的实际剪切速率低于6.8 s-1，则当前推荐的粘度和温度均被低估，应使用更高的压实温度。根据PG 64-22的相角和不可恢复的蠕变顺应性分析以及PG 76-22M的恢复百分比，Sasobit®的含量在2％至4％之间。当前使用的车辙系数G * /sinδ无法表明任何最佳数量。相角值表明，如果在一个等级的较高温度下进行车辙，则过量的Sasobit®将增加车辙的可能性。在相同刚度的温度下进行的蠕变和恢复测试表明，添加Sasobit®可以在较低应力下提高耐车辙性，而在较高应力下则可以提高车辙潜力。 APA车辙深度表明，在WMA温度下制备的Sasobit®混合物比没有Sasobit®的HMA更好。但是，从提取的沥青粘合剂的时效评估中发现，降低的生产温度会降低时效并可能增加车辙敏感性。最后，从一项探索性研究得出的结论是，使用AFM可以通过蜡的形态来区分蜡改性的沥青粘合剂。总体而言，这项研究提供了有关流变学和性能的基本发现，这将有助于在美国实施热拌沥青。

著录项

  • 作者

    Saha, Rajan.;

  • 作者单位

    Louisiana Tech University.;

  • 授予单位 Louisiana Tech University.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2013
  • 页码 176 p.
  • 总页数 176
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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