A novel numerical algorithm for 2D and 3D modelling of recycled aggregate with different geometries

IF 1.8 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY Magazine of Concrete Research Pub Date : 2023-01-24 DOI:10.1680/jmacr.22.00214

Minyao Xu, Yao Wang

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Abstract

The establishment of an aggregate model that better matches real situations is one of the prerequisites to studying the mechanical properties of concrete. Previous models have focused on aggregates with regular shapes; however, this differs from the morphology of real aggregates, particularly recycled aggregate (RA). Due to the presence of adhered mortar, RA has more complex structural characteristics than natural aggregate (NA). It is therefore difficult to model RA, especially the distributions of irregular angles and sharp corners. A new modelling method based on the compression of circles and spheres is proposed in order to obtain circular, elliptical and convex polygonal aggregates in two-dimensional (2D) models and spherical, ellipsoidal and convex polyhedral aggregates in 3D models. The compression method has excellent scalability and applies to both NA and RA in both 2D and 3D models. Using the proposed compression modelling method, the aspect ratios, sharp corners, flakes, edges and needles of RA and NA can be characterised. Random aggregate models showed that the compression modelling method was able to construct 2D and 3D geometric models of concrete made with NA and RA with desirable aggregate distributions and aggregate morphological characteristics.

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一种用于不同几何形状再生骨料二维和三维建模的新数值算法

建立更符合实际情况的骨料模型是研究混凝土力学性能的前提之一。以前的模型侧重于具有规则形状的骨料；然而，这与实际骨料，特别是再生骨料（RA）的形态不同。由于存在粘附砂浆，RA比天然骨料（NA）具有更复杂的结构特征。因此，很难对RA进行建模，尤其是不规则角度和锐角的分布。为了在二维（2D）模型中获得圆形、椭圆形和凸多边形聚集体，在三维模型中获得球形、椭球体和凸多面体聚集体，提出了一种基于圆形和球体压缩的新建模方法。该压缩方法具有良好的可扩展性，适用于2D和3D模型中的NA和RA。使用所提出的压缩建模方法，可以表征RA和NA的纵横比、锐角、薄片、边缘和针状物。随机骨料模型表明，压缩建模方法能够构建具有理想骨料分布和骨料形态特征的NA和RA混凝土的二维和三维几何模型。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Magazine of Concrete Research 工程技术-材料科学：综合

CiteScore

4.60

自引率

11.10%

发文量

102

审稿时长

5 months

期刊介绍： For concrete and other cementitious derivatives to be developed further, we need to understand the use of alternative hydraulically active materials used in combination with plain Portland Cement, sustainability and durability issues. Both fundamental and best practice issues need to be addressed. Magazine of Concrete Research covers every aspect of concrete manufacture and behaviour from performance and evaluation of constituent materials to mix design, testing, durability, structural analysis and composite construction.