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基于二维微观结构的非均质建筑材料渗透系数评估模型

Two-Dimensional Microstructure-Based Model for Evaluating the Permeability Coefficient of Heterogeneous Construction Materials.

作者信息

Chen Jiaqi, Yu Shujun, Huang Wei, Wang Hao

机构信息

Department of Civil Engineering, Central South University, Changsha 410075, China.

Department of Civil and Environmental Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA.

出版信息

Materials (Basel). 2023 Aug 28;16(17):5892. doi: 10.3390/ma16175892.

DOI:10.3390/ma16175892
PMID:37687585
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10488672/
Abstract

The permeability coefficient of construction materials plays a crucial role in engineering quality and durability. In this study, a microstructure model based on real aggregate shape and digital image technology is proposed to predict the permeability coefficient of concrete. A two-dimensional, three-component finite element model of cement concrete was established considering the interfacial transition zone (ITZ) between aggregate and mortar. The permeability coefficient prediction model was developed by the finite element method. The accuracy of the model was verified by experimental data, and the influence of the water-cement ratio on the permeability coefficient of concrete was analyzed. The results show that this method has good prediction accuracy with a relative error of 1.73%. According to the verified model, the influences of aggregate content, aggregate characteristics, aggregate location, ITZ thickness, and other factors on the permeability of concrete were explored. The higher the water-cement ratio, the higher the permeability coefficient. With the increase in aggregate content, the permeability coefficient decreases. Aggregate permeability has a significant influence on the effective permeability coefficient of concrete within a certain range. The greater the roundness of aggregate, the greater the permeability of concrete. On the contrary, the larger aggregate size causes lower permeability. The permeability coefficient of concrete with segregation is lower than that with uniform distribution. At the same time, the permeability increases with the increase of ITZ thickness.

摘要

建筑材料的渗透系数在工程质量和耐久性方面起着至关重要的作用。在本研究中，提出了一种基于真实集料形状和数字图像技术的微观结构模型来预测混凝土的渗透系数。考虑集料与砂浆之间的界面过渡区（ITZ），建立了水泥混凝土的二维三分量有限元模型。通过有限元方法建立了渗透系数预测模型。利用试验数据验证了模型的准确性，并分析了水灰比对混凝土渗透系数的影响。结果表明，该方法具有良好的预测精度，相对误差为1.73%。根据验证后的模型，探讨了集料含量、集料特性、集料位置、ITZ厚度等因素对混凝土渗透性的影响。水灰比越高，渗透系数越高。随着集料含量的增加，渗透系数降低。在一定范围内，集料渗透性对混凝土有效渗透系数有显著影响。集料的圆度越大，混凝土的渗透性越大。相反，集料尺寸越大导致渗透性越低。离析混凝土的渗透系数低于均匀分布混凝土的渗透系数。同时，渗透性随着ITZ厚度的增加而增大。

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