کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5437036 | 1509723 | 2017 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Chloride-induced corrosion of steel rebars in simulated pore solutions of alkali-activated concretes
ترجمه فارسی عنوان
خوردگی ناشی از کلراید از میله های فولادی در محل های مخلوط بتن های فعال قلیا
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی صنعتی و تولید
چکیده انگلیسی
The passivation and chloride-induced depassivation of steel rebars immersed in varying alkaline environments (0.80Â M, 1.12Â M and 1.36Â 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 ([Clâ]/[OHâ] 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 0.80Â M, 1.12Â M and 1.36Â M NaOH solutions, respectively. These values all correspond to a constant value of [Clâ]/[OHâ]3Â =Â 1.25, which is a novel relationship to predict the onset of pitting, interlinking chloride concentration and the solubility of the passive film.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cement and Concrete Research - Volume 100, October 2017, Pages 385-397
Journal: Cement and Concrete Research - Volume 100, October 2017, Pages 385-397
نویسندگان
Shishir Mundra, Maria Criado, Susan A. Bernal, John L. Provis,