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3-D virtual design and microstructural modeling of asphalt mixture based on a digital aggregate library
Computers & Structures ( IF 4.7 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.compstruc.2020.106378
Can Jin , Feilong Zou , Xu Yang , Kai Liu

Abstract Structural indicators of asphalt mixtures, including aggregate gradation, spatial distribution, orientation, shape, angularity, texture, aggregate content, asphalt content and air void content, determine mixture heterogeneity and therefore significantly affect the micromechanical response of mixtures. An approach to the virtual design of mixture microstructure using structural indicators is proposed, based on a digital library of realistic aggregates. The methodology comprises three main steps, as follows: (1) a digital library containing almost 3000 reconstructed grains with quantified morphological properties based on computed tomography (CT) imaging is established; (2) aggregates which are consistent with volumetric and morphological assignments are identified in the library as the aggregate component of the mixture; and (3) the positions and orientations of selected aggregates are determined according to their distributional assignment, and consequently, the asphalt mortar and air void components are identified to obtain the microstructure of the virtual mixture. The proposed approach customizes the morphology and spatial distribution of aggregates and the content of the three phases of specimens to simulate the mixture’s microstructure, which facilitates the study of the correlation between the structural indicators and the mechanical responses of mixtures. Numerical simulations of indirect tensile tests were conducted to show different mechanical properties of obtained specimens.

中文翻译:

基于数字集料库的沥青混合料 3D 虚拟设计和微观结构建模

摘要 沥青混合料的结构指标,包括骨料级配、空间分布、取向、形状、棱角、质地、骨料含量、沥青含量和空隙率,决定了混合料的非均质性,因此显着影响了混合料的微观力学响应。基于真实骨料的数字库,提出了一种使用结构指标进行混合物微观结构虚拟设计的方法。该方法包括以下三个主要步骤:(1)建立一个包含近3000个基于计算机断层扫描(CT)成像的具有量化形态学特性的重构晶粒的数字库;(2) 与体积和形态分配一致的聚集体在库中被识别为混合物的聚集体成分;(3) 根据其分布分配确定所选骨料的位置和取向,从而识别沥青砂浆和空隙组分以获得虚拟混合物的微观结构。该方法通过定制集料的形态和空间分布以及试样三相的含量来模拟混合物的微观结构,这有助于研究结构指标与混合物力学响应之间的相关性。进行了间接拉伸试验的数值模拟,以显示所获得试样的不同机械性能。识别沥青砂浆和空隙组分以获得虚拟混合物的微观结构。该方法通过定制集料的形态和空间分布以及试样三相的含量来模拟混合物的微观结构,这有助于研究结构指标与混合物力学响应之间的相关性。进行了间接拉伸试验的数值模拟,以显示所获得试样的不同机械性能。识别沥青砂浆和空隙组分以获得虚拟混合物的微观结构。该方法通过定制集料的形态和空间分布以及试样三相的含量来模拟混合物的微观结构,这有助于研究结构指标与混合物力学响应之间的相关性。进行了间接拉伸试验的数值模拟,以显示所获得试样的不同机械性能。这有助于研究结构指标与混合物力学响应之间的相关性。进行了间接拉伸试验的数值模拟,以显示所获得试样的不同机械性能。这有助于研究结构指标与混合物力学响应之间的相关性。进行了间接拉伸试验的数值模拟,以显示所获得试样的不同机械性能。
更新日期:2021-01-01
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