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Improving the Properties of Reclaimed Asphalt Pavement for Roadway Base Applications through Blending and Chemical Stabilization.

机译：通过混合和化学稳定作用来改善道路基础应用的再生沥青路面的性能。

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摘要

Reclaimed Asphalt Pavement (RAP) is produced by milling during resurfacing operations. Finding innovative ways to incorporate RAP into highway base course applications will provide both environmental and economic benefits by allowing in situ recycling of material for projects such as widening or shoulder addition. RAP is a well-drained granular material which is already on site, however 100% RAP has low bearing strength and creeps under load.;The objective of this research was to develop methods to improve RAP's strength while reducing creep to an acceptable level through blending with high quality crushed limestone aggregate and/or by chemical stabilization with asphalt emulsion, Portland cement, or lime. RAP/aggregate blends with and without chemical stabilization were compacted by modified Proctor, Marshall, or gyratory methods, cured, and tested for strength and creep. Strength tests included limerock bearing ratio (LBR), a variant of the CBR test, unconfined compression, Marshall compression, and indirect tensile tests. Strength specimens were tested dry and soaked to evaluate retained strength. One dimensional creep testing was performed using seven day oedometer tests.;RAP/aggregate blends have the potential to be used successfully as a base course material. Blends of RAP with 50% limerock base material attained a soaked LBR strength of 100 and acceptable levels of creep with the addition of 1% of either asphalt emulsion or cement. Blends or RAP with 75% or more limerock attained a soaked LBR close to 100 and low levels of creep without any chemical stabilizer. In general adding RAP to limerock blends increased the soaked retained strength and improved permeability compared to 100% limerock.;Gyratory compaction achieved higher densities than modified Proctor or Marshall compaction and improved RAP's strength by a factor of two to three compared to modified Proctor compaction at the same density but had less effect on creep. Field testing is required to determine whether it is feasible to reproduce the gyratory compaction results on an actual construction site. Significant variability was noted between results with different blends, compaction methods, and stabilizing agents. Site specific performance testing should be conducted to establish the viability of blending RAP into a base or subbase.
机译：再生沥青路面（RAP）是在重铺路面的过程中通过铣削生产的。寻找创新方法将RAP纳入高速公路基础课程应用中，将允许原位回收用于扩建或路肩加建等项目的材料，从而为环境和经济带来好处。 RAP是一种排水良好的粒状材料，已经在现场使用，但是100％RAP具有较低的承载强度和在载荷作用下的蠕变。该研究的目的是开发一种方法，以提高RAP的强度，同时通过混合将蠕变降低到可接受的水平可以使用高质量的石灰石碎料和/或通过沥青乳胶，硅酸盐水泥或石灰进行化学稳定处理。通过改良的Proctor，Marshall或旋转法将具有和不具有化学稳定性的RAP /骨料共混物压实，固化并测试强度和蠕变。强度测试包括石灰岩承载比（LBR），CBR测试的变体，无边压缩，马歇尔压缩和间接拉伸测试。将强度样品干燥测试并浸泡以评估保留的强度。一维蠕变测试是使用7天的里程表测试进行的； RAP /骨料混合物有潜力成功用作基础材料。 RAP与50％石灰岩基础材料的共混物通过添加1％的沥青乳液或水泥达到了100的LBR浸泡强度和可接受的蠕变水平。具有75％或更多石灰岩的共混物或RAP的LBR浸泡率接近100，并且蠕变水平低，并且没有任何化学稳定剂。通常，与100％石灰岩相比，在石灰岩混合物中添加RAP可以提高浸泡后的保留强度并改善渗透率。;相比于Proctor压实法，旋转压实获得的密度比改良的Proctor或Marshall压实法更高，并且RAP的强度提高了2-3倍。相同的密度，但对蠕变的影响较小。需要现场测试，以确定在实际施工现场重现回旋压实结果是否可行。在使用不同混合物，压实方法和稳定剂的结果之间，注意到了显着的差异。应该进行特定于站点的性能测试，以确定将RAP混合到基础或子基础中的可行性。

著录项

  • 作者

    Bleakley, Albert Marshall, Jr.;

  • 作者单位

    Florida Institute of Technology.;

  • 授予单位 Florida Institute of Technology.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2012
  • 页码 334 p.
  • 总页数 334
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 农学（农艺学）;
  • 关键词

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