碱激发胶凝材料硬化体内Na^(+)分布规律模拟  

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

作　　者：卞立波 陶志 赵阳光 巴合卓力·克孜尔开勒迪 赵乙平 BIAN Libo;TAO Zhi;ZHAO Yangguang;BA Hezhuoli·Kezierkailedi;ZHAO Yiping(School of Civil and Traffic Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;Beijing Collaborative Innovation Center for Energy Conservation and Emission Reduction and Sustainable Urban-Rural Development,Beijing 100044,China)

机构地区：[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

出　　处：《材料导报》2024年第3期116-121,共6页Materials Reports

基　　金：国家自然科学基金(51578039);北京市自然科学基金(8174063)。

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)m^(2)/s、湿度水头∅=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。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)m^(2)/s,the humidity parameters∅=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.

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 

分 类 号：TU521.4[建筑科学—建筑技术科学]