Numerical investigation on gypsum and ettringite formation in cement pastes subjected to sulfate attack

被引：28

作者：

Zuo, Xiao-Bao ^{[1
]}

Wang, Jia-Lin ^{[1
]}

Sun, Wei ^{[2
]}

Li, Hua ^{[2
]}

Yin, Guang-Ji ^{[1
]}

机构：

[1] Nanjing Univ Sci & Technol, Dept Civil Engn, Nanjing 210094, Jiangsu, Peoples R China

[2] Southeast Univ, Jiangsu Key Lab Construct Mat, Nanjing 211189, Jiangsu, Peoples R China

来源：

COMPUTERS AND CONCRETE | 2017年 / 19卷 / 01期

基金：

美国国家科学基金会;

关键词：

model; XRD-Rietveld analysis; gypsum; ettringite; cement pastes; sulfate attack; PORTLAND-CEMENT; ION DIFFUSION; TRANSPORT PATHS; CONCRETE; DAMAGE; DETERIORATION; MECHANISMS; TORTUOSITY; STRENGTH;

D O I：

10.12989/cac.2017.19.1.019

中图分类号：

TP39 [计算机的应用];

学科分类号：

081203 ; 0835 ;

摘要：

This paper uses modelling and experiment to perform a quantitative analysis for the gypsum and ettringite formations in cement pastes subjected to sulfate attack. Firstly, based on Fick's law and chemical reaction kinetics, a diffusion model of sulfate ions in cement pastes is proposed, and then the model of the gypsum and ettringite formations is established to analyze its contents in cement pastes with corrosion time. Secondly, the corrosion experiment of the specimens with cement pastes immersed into 2.5%, 5.0% and 10.0% Na2SO4 solutions are carried out, and by using XRD-Rietveld method, the phases of powder samples from the specimens are quantitatively analyzed to obtain the contents of gypsum and ettringite in different surface depth, solution concentration and corrosion time. Finally, the contents of gypsum and ettringite calculated by the models are compared with the results from the XRD experiments, and then the effects of surface depth, corrosion time and solution concentration on the gypsum and ettringite formations in cement pastes are discussed.

引用

页码：19 / 31

页数：13

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