Permeability modeling of self-healing due to calcium carbonate precipitation in cement-based materials with mineral additives

被引：6

作者：

Yuan Zheng-cheng ^{[1
]}

Jiang Zheng-wu ^{[1
]}

Chen Qing ^{[1
]}

机构：

[1] Tongji Univ, Sch Mat Sci & Engn, Minist Educ, Key Lab Adv Civil Engn Mat, Shanghai 201804, Peoples R China

来源：

JOURNAL OF CENTRAL SOUTH UNIVERSITY | 2019年 / 26卷 / 03期

基金：

中国国家自然科学基金;

关键词：

cement-based material; self-healing; mineral additive; calcium carbonate; model; CRYSTALLINE ADMIXTURES; WATER PERMEABILITY; COMPOSITES; CONCRETE; MICROCRACKS; CAPABILITY; HYDRATION; DISSOLUTION; CRACKS;

D O I：

10.1007/s11771-019-4028-4

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The permeability modeling of self-healing due to calcium carbonate precipitation in cement-based materials with mineral additives was studied in this work. The parameters of calcium carbonate precipitation during self-healing were simulated. A permeability modeling of self-healing, combined with numerical simulation of calcium carbonate formation, was proposed based on the modified Poiseuille flow model. Moreover, the percentage of calcium carbonate in healing products was measured by TG-DTA. The simulated results show that self-healing can be dramatically promoted with the increase of pH and Ca2+ concentration. The calculated result of permeability is consistent with that measured for cracks appearing in middle or later stages of self-healing, it indicates that this model can be used to predict the self-healing rate to some extent. In addition, TG-DTA results show that the percentage of calcium carbonate in healing products is higher for mortar with only chemical expansion additives or cracks appearing in the later stage, which can more accurately predict the self-healing rate for the model.

引用

页码：567 / 576

页数：10

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