Effect of Different Curing Regimes on the Corrosion of Alkali-Activated Slag Concrete Reinforcement Under Carbonation Environment

被引：0

作者：

Liang, Yongning ^{[1
,2
]}

Liu, Wudong ^{[1
]}

Zhao, Kai ^{[2
]}

Ji, Tao ^{[2
]}

机构：

[1] School of Advanced Manufacturing, Fuzhou University, Fujian, Quanzhou

[2] College of Civil Engineering, Fuzhou University, Fuzhou

来源：

Cailiao Daobao/Materials Reports | 2024年 / 38卷 / 11期

基金：

中国国家自然科学基金;

关键词：

alkali-activated slag concrete; carbonization; curing regimes; electrochemical test; pore structure; steel corrosion; weight loss rate;

D O I：

10.11896/cldb.22090297

中图分类号：

学科分类号：

摘要：

I this work,the effects of standard curing,saturated Ca(OH)2 solution curing and autoclave curing on the corrosion of reinforcement in alkali-activated slag concrete with CaO+Na2CO3 as the exciter (CNC)were investigated under accelerated carbonation environment (CO2 concentration of 20%). The results show that compared with standard curing,saturated Ca(OH)2 solution curing does not change the hydration products of CNC but can make the early hydration of CNC more sufficient. Therefore,the average pore size decreases. Autoclaving curing converts the hydration products of CNC from C-S-H gel into hydrogarnet and 11-? type tobermorite. Therefore,the average pore size and total porosity decrease significantly. Under the same accelerated carbonization conditions,compared with standard curing,the carbonization depth of CNC decreased,the high probability corrosion time of reinforcement in CNC delayed,and the weight loss rate of reinforcement in CNC decreased both in saturated Ca(OH)2 solution curing and in autoclaving curing. Under the same curing conditions,the corrosion resistance of steel bars in CNC cured by standard curing and saturated Ca(OH)2 solution is much less than that in ordinary Portland cement concrete. The corrosion resistance of steel bars in CNC cured by autoclaving was better than that in ordinary Portland cement concrete. © 2024 Cailiao Daobaoshe/ Materials Review. All rights reserved.

引用

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