Chloride-induced corrosion of steel rebars in simulated pore solutions of alkali-activated concretes

被引：196

作者：

Mundra, Shishir ^{[1
]}

Criado, Maria ^{[1
]}

Bernal, Susan A. ^{[2
]}

Provis, John L. ^{[1
]}

机构：

[1] Univ Sheffield, Dept Mat Sci & Engn, Sir Robert Hadfield Bldg, Sheffield S1 3JD, S Yorkshire, England

[2] Univ Sheffield, Dept Civil & Struct Engn, Sir Frederick Mappin Bldg, Sheffield S1 3JD, S Yorkshire, England

来源：

CEMENT AND CONCRETE RESEARCH | 2017年 / 100卷

基金：

欧洲研究理事会;

关键词：

Chloride (D); Corrosion (C); Electrochemical properties (C); Pore solution (B); Alkali activated cement (D); FLY-ASH MORTARS; INDUCED REINFORCEMENT CORROSION; HYDROXIDE SOLUTION; PASSIVE FILMS; STAINLESS-STEEL; IRON ELECTRODES; CARBON-STEEL; MILD-STEEL; SPECTROSCOPY; THRESHOLD;

D O I：

10.1016/j.cemconres.2017.08.006

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The passivation and chloride-induced depassivation of steel rebars immersed in varying alkaline environments (0.80 M, 1.12 M and 1.36 M NaOH solutions), simulating the pore solutions of low-Ca alkali-activated concretes, were investigated using a range of electrochemical techniques. The passive film on the steel rebars was complex in chemical makeup, composed of Fe hydroxides, oxy-hydroxides and oxides. An increased degree of passivation of the rebars was observed when exposed to solutions with higher hydroxide concentrations. The critical chloride level ([Cl-]/[OH-] ratio) required to induce depassivation of steel was strongly dependent on the alkalinity of the pore solution, and was found to be 0.90, 1.70 and 2.40 for 0.80 M, 1.12 M and 1.36 M NaOH solutions, respectively. These values all correspond to a constant value of [Cl-]/[OH-](3) = 1.25, which is a novel relationship to predict the onset of pitting, interlinking chloride concentration and the solubility of the passive film.

引用

页码：385 / 397

页数：13

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