碱激发胶凝材料硬化体内Na+分布规律模拟

doi:10.11896/cldb.22090192

材料导报

2024, Vol. 38

Issue (3): 22090192-6 https://doi.org/10.11896/cldb.22090192

无机非金属及其复合材料

碱激发胶凝材料硬化体内Na⁺分布规律模拟

卞立波^1,2,*, 陶志^1,2, 赵阳光^1,2, 巴合卓力·克孜尔开勒迪^1,2, 赵乙平^1,2

1 北京建筑大学土木与交通工程学院,北京 100044
2 北京节能减排与城乡可持续发展省部共建协同创新中心,北京 100044

Simulation of Na⁺ Distribution Law of Alkali-activated Cementitious Materials Hardened Paste

BIAN Libo^1,2,*, TAO Zhi^1,2, ZHAO Yangguang^1,2, BA Hezhuoli·Kezierkailedi^1,2, ZHAO Yiping^1,2

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

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摘要本工作通过试验探究了标准养护条件下的碱激发胶凝材料硬化体内Na⁺在一维方向上的分布规律。同时,基于 Fick扩散方程,采用COMSOL Multiphysics有限元模拟软件,通过有限元条件下硬化体内的Na⁺扩散系数、湿度水头和孔隙率等边界条件的设定,建立了碱激发胶凝材料硬化体有限元模型,模拟了碱激发胶凝材料硬化体一维方向上Na⁺的分布规律。试验结果表明,在标准养护条件下,0~3 d碱激发胶凝材料硬化体内Na⁺的迁移量呈“∨”型分布,Na⁺以两端析出为主,3~28 d碱激发胶凝材料硬化体内的Na⁺迁移量呈“∧”型分布,Na⁺以内部迁移为主。基于Fick扩散定律的COMSOL Multiphysics仿真模拟,在扩散系数D_F,C=1×10^-8 m²/s、湿度水头φ=0.85、孔隙率∈_p=20%的条件下建立溶质传递方程与溶剂运输方程,拟合得到的碱激发胶凝材料硬化体内Na⁺一维分布规律与试验结果相近。本工作实现了基于试验的碱激发胶凝材料硬化体内Na⁺一维分布的数学模拟。

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	卞立波
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	巴合卓力·克孜尔开勒迪
	赵乙平

关键词: 碱激发胶凝材料硬化体离子迁移量一维分布有限元模拟

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 D_{F, 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.

Key words: alkali-activated cementitious materials(AACMs) hardened paste ions migration amount one dimensional distribution finite element simulation

出版日期: 2024-02-10 发布日期: 2024-02-19

ZTFLH:

TU521.4

基金资助: 国家自然科学基金(51578039);北京市自然科学基金(8174063)

通讯作者: *卞立波,北京建筑大学土木与交通工程学院副教授、硕士研究生导师,2006年中国农业大学土木工程专业本科毕业,2009年北京建筑工程学院结构工程专业硕士研究生毕业,2016年北京科技大学土木工程专业博士研究生毕业。目前主要从事新型胶凝材料、功能性建筑材料等方面的教学和研究工作。承担科技部重点研发计划子课题、北京市自然科学基金等多项项目,发表相关论文40余篇,包括Materials、Journal of Building Engineering、Journal of Wuhan University of Technology(Materials)等。bianlibo1984@163.com

引用本文:

卞立波, 陶志, 赵阳光, 巴合卓力·克孜尔开勒迪, 赵乙平. 碱激发胶凝材料硬化体内Na⁺分布规律模拟[J]. 材料导报, 2024, 38(3): 22090192-6.
BIAN Libo, TAO Zhi, ZHAO Yangguang, BA Hezhuoli·Kezierkailedi, ZHAO Yiping. Simulation of Na⁺ Distribution Law of Alkali-activated Cementitious Materials Hardened Paste. Materials Reports, 2024, 38(3): 22090192-6.

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https://www.mater-rep.com/CN/10.11896/cldb.22090192 或 https://www.mater-rep.com/CN/Y2024/V38/I3/22090192

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