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Developing simple lab test to evaluate HMA resistance to moisture, rutting, thermal cracking distress.

机译：开发简单的实验室测试，以评估HMA的耐湿性，车辙，热裂纹应力。

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摘要

The pavement distresses including stripping, rutting, and low temperature cracking have been known to greatly decrease the service life of pavement. The simple laboratory tests are used to measure HMA's (Hot Mix Asphalt) fundamental engineering properties that can be linked back to the pavement distress-prediction models. It is envisioned that these simple laboratory tests would play a key role in the quality control of HMA mixtures. To minimize premature pavement distresses, it is imperative to investigate the relationship between the simple laboratory tests and pavement distresses.; Moisture induced damage in asphalt concrete pavement, better known as stripping, is a primary cause of distresses in the Hot Mix Asphalt layer. AASHTO T 283 has historically been used to detect moisture damage of asphalt mixes. This method is established for the Marshall mix design process. However, the current hot mix asphalt design calls for the use of Superpave mix design procedure using the Superpave Gyratory Compactor. The differences in the mix design methods will most likely introduce significant differences in stripping test results. Therefore, there is a need to improve the AASHTO T 283 test procedure and to develop the new criterion for the Superpave HMA specimens. A structured laboratory program test is conducted in this research to study the effects of the various factors on the HMA specimen's susceptibility to moisture damage. The experimental test program is divided into two parts: one part is a complete factorial experimental program for two aggregate sources with virgin asphalt binder, the second part is a partial factorial experimental program for the other two aggregate sources with polymer modified asphalt binders. The complete factorial experiment is used to identify and evaluate the contributions of the individual factors, along with all the possible interactions among the various factors. The partial factorial experiment, on the other hand, is used for validating findings from complete factorial experimental results. In the data analysis, the effects of different factors on dry tensile strength, freeze-thaw conditioned tensile strength, and tensile strength ratio (TSR) are investigated in this research. The effects of all the factors investigated in this research are summarized in this research. The recommendations for the proposed stripping test procedure for Superpave HMA are given finally.; Rutting and low temperature cracking are also primary failure modes of Hot Mix Asphalt pavements. In the mid-1980s, polymer-modified asphalt concrete mixture has been widely used to minimize rutting and low temperature cracking failures of flexible pavement. In this research, three polymer modifiers are used in the laboratory test. The influences of the modifiers to rutting resistance and low temperature cracking resistance are investigated and regression procedures are performed in an attempt to develop mathematical relationships between pavement distresses properties and HMA's physical properties and strength properties obtained from the simple laboratory tests.
机译：已知包括剥离，车辙和低温开裂的路面故障会大大降低路面的使用寿命。简单的实验室测试用于测量HMA（热拌沥青）的基本工程特性，这些特性可以链接到路面破损预测模型。可以预见，这些简单的实验室测试将在HMA混合物的质量控制中发挥关键作用。为了最大程度地减少过早的路面困扰，必须研究简单的实验室测试与路面困扰之间的关系。潮气对沥青混凝土路面造成的损坏（通常称为剥离）是造成热拌沥青层中出现问题的主要原因。 AASHTO T 283历史上一直用于检测沥青混合料的水分破坏。该方法是为马歇尔混合设计过程建立的。但是，当前的热拌沥青设计要求使用Superpave回转压实机进行Superpave拌和设计程序。混合物设计方法的差异很可能会在剥离测试结果中带来重大差异。因此，需要改进AASHTO T 283测试程序并开发Superpave HMA标本的新标准。在这项研究中进行了结构化的实验室程序测试，以研究各种因素对HMA标本对湿气损害的敏感性的影响。实验测试程序分为两部分：一部分是使用原始沥青粘合剂的两种骨料来源的完整阶乘实验程序，第二部分是使用聚合物改性沥青粘合剂的另外两种骨料来源的部分阶乘实验程序。完整的阶乘实验用于识别和评估各个因素的贡献，以及各种因素之间的所有可能相互作用。另一方面，部分阶乘实验用于验证来自完整阶乘实验结果的发现。在数据分析中，研究了不同因素对干抗张强度，冻融条件抗张强度和抗张强度比（TSR）的影响。本研究总结了在本研究中调查的所有因素的影响。最后给出了针对Superpave HMA的剥离测试程序的建议。车辙和低温开裂也是热拌沥青路面的主要破坏模式。在1980年代中期，聚合物改性的沥青混凝土混合物已被广泛用于使柔性路面的车辙和低温开裂破坏最小化。在这项研究中，在实验室测试中使用了三种聚合物改性剂。研究了改性剂对耐车辙性和耐低温开裂性的影响，并进行了回归程序，以期开发出由简单的实验室测试得出的路面破损性能与HMA物理性能和强度性能之间的数学关系。

著录项

  • 作者

    Zhu, Feng.;

  • 作者单位

    The University of Akron.;

  • 授予单位 The University of Akron.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2008
  • 页码 260 p.
  • 总页数 260
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;
  • 关键词

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