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硫酸盐侵蚀作用下砂浆的细观尺度有限元建模

Mesoscale Finite Element Modeling of Mortar under Sulfate Attack.

作者信息

Guan Zhongzheng, Wang Peng, Li Yue, Li Yong, Hu Bo, Wang Yichao

机构信息

Key Laboratory of Roads and Railway Engineering Safety Control, Ministry of Education, Shijiazhuang Tiedao University, Shijiazhuang 050013, China.

School of Civil Engineering, Hebei University of Technology, Handan 056107, China.

出版信息

Materials (Basel). 2022 Aug 8;15(15):5452. doi: 10.3390/ma15155452.

DOI:10.3390/ma15155452
PMID:35955384
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9369817/
Abstract

In this paper, a 2D mesoscale finite element (FE) numerical model of mortar, considering the influence of the ITZ, was proposed to evaluate the corrosion of mortar in sodium sulfate. On the mesoscale, the corroded mortar was regarded as a three-phase composite material composed of sand, cement paste, and an interface transition zone (ITZ). Firstly, the volume fractions and mechanical parameters (elastic modulus, Poisson's ratio, and strength) of the mesoscale phases were obtained. Then, the cement paste and the ITZ were combined to form an equivalent matrix by homogenization methods, and the calibrated constitutive relations of the equivalent matrix were established. Subsequently, a two-dimensional (2D) random circular aggregate (RCA) model and a 2D random polygonal aggregate (RPA) model of corroded mortar were established using the random aggregate model. The failure process of corroded mortar specimens under uniaxial compression was simulated by the mesoscale FE numerical model. Comparing the simulation results with the measured stress-strain curves of the uniaxial compression test, it was found that the simulation results of the 2D RP model were closer to the experimental results than those of the 2D RC model. Meanwhile, the numerical simulation results were in good agreement with the experimental results, and the error values of peak stress between the simulation results and the measured results were within 7%, which showed that the 2D mesoscale FE model could accurately predict the results of a uniaxial compression test of a mortar specimen under sulfate attack.

摘要

本文提出了一种考虑界面过渡区（ITZ）影响的砂浆二维细观有限元（FE）数值模型，以评估砂浆在硫酸钠中的腐蚀情况。在细观尺度上，将腐蚀后的砂浆视为由砂、水泥浆体和界面过渡区（ITZ）组成的三相复合材料。首先，获取了细观相的体积分数和力学参数（弹性模量、泊松比和强度）。然后，通过均匀化方法将水泥浆体和ITZ组合形成等效基体，并建立了等效基体的校准本构关系。随后，利用随机骨料模型建立了腐蚀砂浆的二维（2D）随机圆形骨料（RCA）模型和二维随机多边形骨料（RPA）模型。通过细观有限元数值模型模拟了腐蚀砂浆试件在单轴压缩下的破坏过程。将模拟结果与单轴压缩试验的实测应力-应变曲线进行比较，发现二维RP模型的模拟结果比二维RC模型更接近实验结果。同时，数值模拟结果与实验结果吻合良好，模拟结果与实测结果的峰值应力误差值在7%以内，表明二维细观有限元模型能够准确预测硫酸盐侵蚀下砂浆试件单轴压缩试验的结果。

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