| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
|
|
|
|
|
| Simulation of Na+ Distribution Law of Alkali-activated Cementitious Materials Hardened Paste |
| BIAN Libo1,2,*, TAO Zhi1,2, ZHAO Yangguang1,2, BA Hezhuoli·Kezierkailedi1,2, ZHAO Yiping1,2
|
1 School of Civil and Traffic Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
2 Beijing Collaborative Innovation Center for Energy Conservation and Emission Reduction and Sustainable Urban-Rural Development, Beijing 100044, China |
|
|
|
|
Abstract The Na+ distribution regularity of alkali-activated cementitious materials(AACMs) hardened paste under standard curing rules was discussed in this work. At the same time, the Na+diffusion coefficient parameters, the humidity parameters and porosity were got based on the Fick diffusion equation. The finite element hardened paste model was established and the Na+distribution law of AACMs hardened paste was simulated with the finite element software of COMSOL Multiphysicys. The experiment results showed that the Na+ migration quantity presented ‘∨'distribution in 3 d and the Na+ came out from both ends. The Na+ migration quantity presented ‘∧'distribution from 3 d to 28 d and the Na+ just moved inside the hardened paste. The finite element model based on the diffusion coefficient DF, C=1×10-8 m2/s, the humidity parameters φ=0.85 and the porosity ∈p=20% owned the similar rules to the test results. The mathematical model better simulated the one-dimensional Na+ distribution of AACMs hardened paste on the experiment.
|
|
Published: 10 February 2024
Online: 2024-02-19
|
|
|
| Fund:National Natural Science Foundation of China (51578039) and the Natural Science Foundation of Beijing (8174063). |
|
|
1 Lv W, Sun Z, Su Z. Cement and Concrete Composites, 2019, 106, 103.
2 Nguyen Q H, Lorente S, Duhart-Barone A, et al. Construction and Building Materials, 2018, 191, 853.
3 Kang S P, Kwon S J. Construction and Building Materials, 2017, 133, 459.
4 Pratt P L, Wang S D, Pu X C, et al. Advances in Cement Research, 2015, 7(27), 93.
5 Sun J. Study on efflorescence of slag-based geopolymer activated by so-dium/potassium silicate solution. Ph. D. Thesis, Guangxi University, China, 2019(in Chinese).
孙佳. 钠/钾水玻璃激发矿渣基地聚物的泛碱研究. 博士学位论文, 广西大学, 2019.
6 Gao Z R, Xu Y F, Li S E, et al. Journal of Hohai University(Natural Sciences), 2016, 44(5), 433(in Chinese).
高子瑞, 徐永福, 李淑娥, 等. 河海大学学报(自然科学版), 2016, 44(5), 433.
7 Hohannesson B F. Cement and Concrete Research, 1999, 8, 1261 .
8 Hohannesson B F. Advanced Cement Based Materials, 1997, 6, 71.
9 Wu Yanqing. Dynamics of fluid flow and contaminant transport in porous media, Shanghai Jiao Tong University Press, China, 2007(in Chinese).
仵彦卿. 多孔介质污染物迁移动力学, 上海交通大学出版社, 2007.
10 Marc Mainguy, Claire Tognazzi. Cement and Concrete Research, 2000, 30, 83. |
|
|
|
渝公网安备50019002502923号 © Editorial Office of Materials Reports.
2024, Vol. 38 
