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An Investigation of Various Percentages of Reclaimed Asphalt Pavement on the Performance of Asphalt Pavements.

机译：对再生沥青路面各种百分比对沥青路面性能的影响的调查。

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摘要

With the increasing cost of asphalt binder and the growing concern over the availability of quality aggregates, the use of higher percentages of reclaimed asphalt pavements (RAP) has become of much interest across the country. Research has shown that the RAP recovered from construction sites still contains usable materials, both in the recycled aggregates and recycled binder. However, since the RAP binder has been aged during its service life, the use of RAP in new pavement construction may cause the stiffness of the blended binder to increase. Due to this increased stiffness, it is sometimes necessary for a "grade shift" in the virgin binder in order to result in the specifications for the desired performance grade. The use of higher percentages of RAP in construction would provide initial cost savings. However, a life cycle cost analysis was needed in order to determine whether use of higher percentages of RAP provided an economical advantage for the life cycle, not just initially. In order to predict life cycle costs, the fatigue life and rut resistance of mixtures containing various amounts (15%, 30% and 40%) of RAP were compared to a 100% virgin material mixture. The fatigue life and rut resistance of the mixtures were calculated from laboratory testing using Frequency Sweep Testing using Superpave Simple Shear Tester (SST) and Repeated Simple Shear Tests using SST. The SHRP A-003A surrogate models and the Asphalt Institute models were both used in order to predict pavement performance using the results from the Frequency Sweep Testing and the Repeated Simple Shear Test. Based on these results, the life cycle economic analysis was completed and the optimum percentage of RAP was determined for use in the construction of new pavements for NCDOT. The development of warm mix asphalt (WMA) technology over the recent past has sparked interest in many researchers, engineers and government officials. The use of WMA has incentives including fuel savings, lower emissions, longer hauling distances and longer construction seasons since the use of WMA allows for lower production temperatures. Research has also shown that the reduced production temperatures may reduce the amount of oxidative hardening which may help reduce thermal cracking and block cracking. Due to this benefit, along with the anticipated benefit of better compactability using WMA, it is thought that WMA can be used in mixes containing higher percentages of RAP since less oxidative hardening of the asphalt binder may occur for the already more stiff RAP binder. Mixtures with higher percentages of RAP often have issues with thermal cracking and block cracking due to the stiff binder from the RAP blending with the virgin binder. In order to determine how the use of WMA additives effect the binder rheology of blends containing higher percentages of RAP, Dynamic Shear Rheometer (DSR) and Bending Beam Rheometer (BBR) testing were performed on virgin, blended and RAP binders containing SasobitRTM, a WMA additive. These results can be used to determine the allowable amount of RAP that can be used with WMA.
机译：随着沥青粘合剂成本的增加以及对优质骨料可用性的日益关注，在全国范围内越来越多地使用更高比例的再生沥青路面（RAP）。研究表明，从建筑工地回收的RAP仍然包含有用的材料，包括可再生的骨料和可再生的粘结剂。但是，由于RAP粘结剂在其使用寿命中已经老化，因此在新的路面结构中使用RAP可能会导致混合粘结剂的刚度增加。由于这种增加的刚度，有时有必要在原始粘合剂中进行“等级转换”，以便得出所需性能等级的规格。在建筑中使用较高百分比的RAP可以节省最初的成本。但是，需要进行生命周期成本分析，以确定使用更高百分比的RAP是否为整个生命周期（不仅是最初）提供了经济优势。为了预测生命周期成本，将含有各种量（15％，30％和40％）的RAP的混合物的疲劳寿命和耐车辙性与100％的原始材料混合物进行了比较。混合物的疲劳寿命和耐车辙性是通过使用Superpave简单剪切测试仪（SST）的扫频测试和使用SST进行的重复简单剪切测试的实验室测试计算得出的。 SHRP A-003A替代模型和Asphalt Institute模型都用于使用扫频测试和重复简单剪切测试的结果来预测路面性能。根据这些结果，完成了生命周期经济分析，并确定了RAP的最佳百分比，可用于NCDOT新路面的施工。近年来，热拌沥青（WMA）技术的发展引起了许多研究人员，工程师和政府官员的兴趣。由于使用WMA可以降低生产温度，因此使用WMA具有许多诱因，包括节省燃料，降低排放，延长运输距离和延长施工季节。研究还表明，降低的生产温度可能会减少氧化硬化的数量，这可能有助于减少热裂和块裂。由于该益处，以及预期的使用WMA获得更好的可压实性的益处，人们认为WMA可用于包含更高百分比RAP的混合物中，因为对于已经更加坚硬的RAP粘合剂而言，沥青粘合剂的氧化硬化作用可能较小。 RAP含量较高的混合物通常会因RAP与原始粘合剂混合产生的硬质粘合剂而出现热裂和块裂的问题。为了确定WMA添加剂的使用如何影响含更高百分比RAP的共混物的粘合剂流变学，对含SasobitRTM（一种WMA）的原始，共混和RAP粘合剂进行了动态剪切流变仪（DSR）和弯曲束流变仪（BBR）测试。添加剂。这些结果可用于确定WMA可以使用的RAP允许量。

著录项

  • 作者

    Visintine, Beth.;

  • 作者单位

    North Carolina State University.;

  • 授予单位 North Carolina State University.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2011
  • 页码 232 p.
  • 总页数 232
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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