کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5437209 | 1509733 | 2016 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Local study of the corrosion kinetics of hardened Portland cement under acid attack
ترجمه فارسی عنوان
مطالعه محلی از سینتیک خوردگی سیمان پرتلند سخت تحت حمله اسید
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی صنعتی و تولید
چکیده انگلیسی
Whereas the chemical reactions occurring during the acid corrosion of cementitious materials are now well known, their reaction rates have still not been measured. We propose here a methodology using digital holographic interferometry to access to these pure surface reaction rates. This method makes possible the differentiation between the dissolution and precipitation steps. We use it to measure the reaction rate constant of the dissolution of hardened Portland cement in aqueous solutions of nitric, sulfuric and hydrochloric acids at pHÂ 2. This quantity is seen to be unexpectedly similar for the three acids, with a value of the order of 1Â mg/m2/s. We have measured the evolution of this reaction rate constant with the pH in nitric acid. We have also measured the real pH of the solution at the material surface, which is always alkaline (pHÂ Â >Â 11), even for attacks by solution with pH as low as 1.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cement and Concrete Research - Volume 90, December 2016, Pages 36-42
Journal: Cement and Concrete Research - Volume 90, December 2016, Pages 36-42
نویسندگان
Héloïse Gay, Thomas Meynet, Jean Colombani,