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Analysis of HMA permeability through microstructure characterization and simulation of fluid flow in X-ray CT images

机译:通过X射线CT图像的微观结构表征和流体流动仿真分析HMA渗透率

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摘要

The infiltration of water in asphalt pavements promotes moisture damage primarily through damaging the binder cohesive bond and the adhesive bond between aggregates and binder. Moisture damage is associated with excessive deflection, cracking, and rutting. The first step in addressing the problems caused by the presence of water within pavement systems is quantifying the permeability of hot mix asphalt (HMA) mixes. This dissertation deals with the development of empirical-analytical and numericalapproaches for predicting the permeability of HMA. Both approaches rely on the analysis of air void distribution within the HMA microstructure.The empirical-analytical approach relies on the development of modified forms of the Kozeny-Carman equation and determining the material properties involved in this equation through three dimensional microstructure analyses of X-ray Computed Tomography (CT) images. These properties include connected percent air voids(effective porosity), tortuosity, and air void specific surface area. A database of materials and permeability measurements was used to verify the developed predicting equation. The numerical approach, which is the main focus of this study, includes the development of a finite difference numerical simulation model to simulate the steady incompressible fluid flow in HMA. The model uses the non-staggered system that utilizes only one cell to solve for all governing equations, and it is applicable for cell Reynolds number (Rec) values that are not restricted by |Rec|≤2. The validity of the numerical model is verified through comparisons with closed-form solutions for idealized microstructure. The numerical model was used to find the components of the three-dimensional (3-D) permeability tensor and permeability anisotropy values for different types of HMAmixes. It was found that the principal permeability directions values are almost in thehorizontal and vertical directions with the maximum permeability being in the horizontaldirection.
机译:沥青路面中水的渗透主要通过破坏粘合剂的内聚键和骨料与粘合剂之间的粘合剂键来促进水分破坏。水分损坏与过度的挠曲,开裂和车辙有关。解决路面系统中水的存在引起的问题的第一步是量化热拌沥青混合料的渗透性。本文研究了预测HMA渗透性的经验分析和数值方法。两种方法都依赖于分析HMA微观结构中的气孔分布。经验分析方法依赖于开发改进形式的Kozeny-Carman方程,并通过X-射线的三维微观结构分析确定该方程涉及的材料特性射线计算机断层扫描(CT)图像。这些特性包括连通的空隙率(有效孔隙率),曲折度和空隙率。使用材料和渗透率测量数据库来验证开发的预测方程。数值方法是本研究的重点,其中包括开发有限差分数值模拟模型以模拟HMA中稳定的不可压缩流体流动。该模型使用非交错系统,该系统仅使用一个单元来求解所有控制方程,并且适用于不受| Rec |≤2限制的单元雷诺数(Rec)值。通过与用于理想化微结构的封闭形式解决方案进行比较,验证了数值模型的有效性。数值模型用于查找不同类型的HMAmixs的三维(3-D)渗透率张量和渗透率各向异性值的成分。发现主要渗透率方向值几乎在水平和垂直方向上,最大渗透率在水平方向上。

著录项

  • 作者

    Al Omari Aslam Ali Mufleh;

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  • 年度 2005
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  • 原文格式 PDF
  • 正文语种 en_US
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