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首页> 外文学位 >Effects of low temperatures, repetitive stresses and chemical aging on thermal and fatigue cracking in asphalt cement pavements on Highway 417.
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Effects of low temperatures, repetitive stresses and chemical aging on thermal and fatigue cracking in asphalt cement pavements on Highway 417.

机译：低温，重复应力和化学老化对417高速公路沥青水泥路面热和疲劳开裂的影响。

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摘要

Thermal and fatigue cracking are pavement distresses that deteriorate asphalt pavements in Canada. However, the current AASHTO M320 standard specification protocol does not give satisfactory correlation between the properties measured in the laboratory to thermal and fatigue cracking performance of the asphalt in service. This thesis is aimed at validating the newly developed MTO LS-299 and LS-308 specification test methods for predicting pavement distress. A secondary objective is to determine how well laboratory-aged and field-aged binders correlate with each other in terms of their chemical and physical properties. Chemical testing using infrared (IR) spectroscopy and X-ray fluorescence (XRF), as well as physical and mechanical testing using the regular bending beam rheometer (BBR), extended BBR (eBBR), dynamic shear rheometer (DSR), and double edge notched tension (DENT) tests were performed on laboratory-aged and recovered binders from Highway 417.;Asphalt cements with significant amounts of waste engine oil residues as determined by XRF data were found to have cracked severely due to their high tendency for chemical aging. Western Canadian binders modified with styrene-butadiene-styrene polymer showed low affinity for both chemical and physical aging as determined from their carbonyl indices. Asphalt binders with smaller paraffinic structures exhibited insignificant pavement deterioration while the opposite occurred to those with low aromatic indices according to their IR data. The DSR data show that chemical aging occurs much faster in the laboratory-aged binders than the field-aged binders. The DENT test is able to separate superior performing binders from inferior ones with 86% accuracy according to their CTOD data. The regular BBR gave poor correlation between the laboratory test methods and the performance of the pavements. Good correlation exists between the laboratory test methods and the performance of the pavements in service according to the eBBR data. Pavements without any cracks showed lower grade losses, while pavements with severe thermal cracking recorded higher grade losses after three days of conditioning prior to testing. The study has shown that the eBBR and DENT tests are better tools for predicting pavement performance and provide good specification tests for the control of thermal and fatigue cracking in modern pavements.
机译：热裂纹和疲劳裂纹是路面的困扰，它使加拿大的沥青路面恶化。但是，当前的AASHTO M320标准规范协议并未在实验室中测得的性能与使用中的沥青的热和疲劳开裂性能之间提供令人满意的关联。本文旨在验证新开发的用于预测路面遇险的MTO LS-299和LS-308规格测试方法。第二个目的是确定实验室使用的和现场使用的粘合剂在化学和物理性质方面的相互关系如何。使用红外（IR）光谱和X射线荧光（XRF）进行化学测试，以及使用常规弯曲光束流变仪（BBR），扩展BBR（eBBR），动态剪切流变仪（DSR）和双边缘进行物理和机械测试缺口张力（DENT）测试是在417高速公路上的实验室老化和回收的粘合剂上进行的；通过XRF数据确定的含有大量废机油残留物的沥青水泥由于其化学老化的高度趋势而严重开裂。从苯乙烯-丁二烯-苯乙烯聚合物改性的加拿大西部粘合剂显示出对化学和物理老化的低亲和力，这从它们的羰基指数确定。根据其红外数据，具有较小链烷烃结构的沥青粘合剂的路面劣化不明显，而与具有低芳烃指数的沥青相反。 DSR数据表明，与实验室老化的粘结剂相比，实验室老化的粘结剂的化学老化速度要快得多。 DENT测试能够根据其CTOD数据将性能优异的粘合剂与劣质的粘合剂分离，准确度达86％。常规的BBR在实验室测试方法与人行道性能之间的相关性很差。根据eBBR数据，实验室测试方法与使用中的人行道性能之间存在良好的相关性。在测试前经过三天的修整后，没有任何裂缝的路面显示出较低的坡度损失，而具有严重热裂纹的路面记录了较高的坡度损失。研究表明，eBBR和DENT测试是预测路面性能的更好工具，并为控制现代路面的热裂纹和疲劳裂纹提供了良好的规格测试。

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  • 作者

    Agbovi, Henry Kwame.;

  • 作者单位

    Queen's University (Canada).;

  • 授予单位 Queen's University (Canada).;
  • 学科 Chemistry Polymer.
  • 学位 M.Sc.
  • 年度 2012
  • 页码 155 p.
  • 总页数 155
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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