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Asphalt pavement aging and temperature dependent properties using functionally graded viscoelastic model.

机译：使用功能梯度粘弹性模型的沥青路面老化和温度相关特性。

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摘要

Asphalt concrete pavements are inherently graded viscoelastic structures. Oxidative aging of asphalt binder and temperature cycling due to climatic conditions being the major cause of non-homogeneity. Current pavement analysis and simulation procedures dwell on the use of layered approach to account for these non-homogeneities. The conventional finite-element modeling (FEM) technique discretizes the problem domain into smaller elements, each with a unique constitutive property. However the assignment of unique material property description to an element in the FEM approach makes it an unattractive choice for simulation of problems with material non-homogeneities. Specialized elements such as "graded elements" allow for non-homogenous material property definitions within an element. This dissertation describes the development of graded viscoelastic finite element analysis method and its application for analysis of asphalt concrete pavements.Results show that the present research improves efficiency and accuracy of simulations for asphalt pavement systems. Some of the practical implications of this work include the new technique's capability for accurate analysis and design of asphalt pavements and overlay systems and for the determination of pavement performance with varying climatic conditions and amount of in-service age. Other application areas include simulation of functionally graded fiber-reinforced concrete, geotechnical materials, metal and metal composites at high temperatures, polymers, and several other naturally existing and engineered materials.
机译：沥青混凝土路面是固有的渐变粘弹性结构。沥青粘合剂的氧化老化和气候条件引起的温度循环是非均质性的主要原因。当前的路面分析和模拟程序主要使用分层方法来解决这些不均匀性。传统的有限元建模（FEM）技术将问题域离散为较小的元素，每个元素都具有独特的本构性质。但是，在FEM方法中将唯一的材料属性描述分配给元素，使其成为模拟材料非均质性问题的吸引人的选择。特殊元素（例如“渐变元素”）允许在元素内进行非均质的材料属性定义。本文介绍了分级粘弹性有限元分析方法的发展及其在沥青混凝土路面分析中的应用。结果表明，本研究提高了沥青路面系统仿真的效率和准确性。这项工作的一些实际意义包括这项新技术的能力，可以对沥青路面和覆盖系统进行准确的分析和设计，以及在气候条件和使用年限不同的情况下确定路面性能的能力。其他应用领域包括功能梯度纤维增强混凝土，岩土材料，高温下的金属和金属复合材料，聚合物以及其他几种自然存在的工程材料的模拟。

著录项

  • 作者

    Dave, Eshan V.;

  • 作者单位

    University of Illinois at Urbana-Champaign.;

  • 授予单位 University of Illinois at Urbana-Champaign.;
  • 学科 Engineering Civil.Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 175 p.
  • 总页数 175
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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