硫酸盐侵蚀下水泥净浆膨胀应变计算

殷光吉; 左晓宝; 孙伟; 汤玉娟

doi:10.6052/j.issn.1000-4750.2014.02.0108

硫酸盐侵蚀下水泥净浆膨胀应变计算

1.
南京理工大学土木工程系,南京 210094;
2.
东南大学材料科学与工程学院,南京 211189

基金项目: 国家自然科学基金项目(51378262); 国家“973”计划项目(2009CB623203); 江苏省自然科学基金项目(BK20141396); 南京理工大学; 研究生科研创新/实践计划项目

详细信息

作者简介:
殷光吉(1990―),男,浙江人,硕士生,研究混凝土材料(E-mail: yinxjlove@163.com); 孙伟(1935―),女,山东人,教授,博导,院士,从事水泥基材料研究(E-mail: sunwei@seu.edu.cn); 汤玉娟(1989―),女,江苏人,博士生,从事混凝土材料研究(E-mail: tyjdsr19891103@163.com).

通讯作者:
左晓宝(1968―),男,安徽人,教授,博士,博导,从事混凝土材料与结构、防灾工程研究(E-mail: xbzuo@sina.com).

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- 文章访问数: 349
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出版历程
- 收稿日期: 2014-02-16
- 修回日期: 2014-07-13
- 刊出日期: 2015-09-24

NUMERICAL SIMULATION OF THE EXPANSIVE STRAIN IN CEMENT PASTE SUBJECTED TO SULFATE ATTACK

1.
Department of Civil Engineering, Nanjing University of Science &
2.
Technology, Nanjing 210094, China;

摘要

摘要: 针对硫酸盐侵蚀过程中水泥净浆体积膨胀问题,运用微孔力学理论,建立了水泥净浆基体与其孔隙内钙矾石晶体相互作用的代表性体积单元(RVE)及其力学分析模型;分析了一定钙矾石生成量下的RVE内膨胀应变在微观尺度上的空间分布规律;通过均匀化方法,将微观尺度上的RVE内膨胀应变转化为宏观尺度上RVE所在位置点的等效应变,分析了该等效应变随钙矾石生成量的变化规律。分析结果表明：微观尺度上,孔隙率为0.1的RVE内钙矾石晶体和侵蚀溶液组成的内球体各向为拉应变,水泥净浆外球壳径向为压应变、环向为拉应变;宏观尺度上,孔隙率为0.1的RVE所在位置点的径向等效应变为压应变,且随钙矾石生成量的增加而增大,而环向等效应变为拉应变,且随钙矾石的生成量的增加而增大。
- 硫酸盐侵蚀 /
- 力学分析模型 /
- 水泥净浆 /
- 代表性体积单元 /
- 膨胀应变 /
- 钙矾石
Abstract: To investigate the volume expansive of cement paste subjected to sulfate attack, based on microporous mechanics, this paper established the mechanics model of representative volume element (RVE) composed by cement paste matrix and ettringite crystal. From microcosmic scale, the distribution of expansive strain within RVE under a certain amount of ettringite formation is analyzed. Based on homogenization method, the expansive strain of RVE on microcosmic scale is converted to the expansive equivalent strain of RVE locative point on macroscopic scale. And the variation regularity of expansive equivalent strain with the amount of ettringite formation is studied. The results show that on microcosmic scale, the isotropic strain of ettringite sphere with RVE of 0.1 porosity is tensile strain, the radial strain of cement matrix spherical shell is compressive strain, but the hoop strain is tensile strain. On macroscopic scale, for RVE of 0.1 porosity, the radial expansive equivalent strain is compressive strain, the hoop expansive equivalent strain is tensile strain, and they both increase with the larger amount of ettringite formation.
- sulfate attack /
- mechanics analysis model /
- cement paste /
- representative volume element (RVE) /
- expansive strain /
- ettringite

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参考文献(22)

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2.	杨桃，魏丽君，许睿霖，陈英豪，罗正东. 铅锌矿尾砂水稳层力学及耐久性研究. 市政技术. 2024(08): 85-92 . 百度学术
3.	王鹏程，叶阳升，尧俊凯，陈锋，张千里. 硫酸盐侵蚀条件下无砟轨道路基上拱特性研究. 铁道学报. 2021(06): 135-140 . 百度学术
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5.	王佳林，左晓宝，马强，殷光吉，汤玉娟. 硫酸盐侵蚀下轴心受压钢筋混凝土柱应力时变过程的数值分析. 土木建筑与环境工程. 2018(01): 30-38 . 百度学术

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文章访问数: 349
HTML全文浏览量: 18
PDF下载量: 83
被引次数: 14

硫酸盐侵蚀下水泥净浆膨胀应变计算

通讯作者: 左晓宝(1968―),男,安徽人,教授,博士,博导,从事混凝土材料与结构、防灾工程研究(E-mail: xbzuo@sina.com).

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出版历程

NUMERICAL SIMULATION OF THE EXPANSIVE STRAIN IN CEMENT PASTE SUBJECTED TO SULFATE ATTACK

期刊类型引用(5)

其他类型引用(9)

计量

出版历程

目录

通讯作者:
左晓宝(1968―),男,安徽人,教授,博士,博导,从事混凝土材料与结构、防灾工程研究(E-mail: xbzuo@sina.com).