کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
6714154 1428735 2018 12 صفحه PDF سفارش دهید دانلود رایگان
عنوان انگلیسی مقاله ISI
Assessment of the electrochemical state of steel reinforcement in water saturated concrete by resistivity measurement
ترجمه فارسی عنوان
ارزیابی وضعیت الکتروشیمیایی تقویت فولاد در بتن اشباع آب با اندازه گیری مقاومت
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کلمات کلیدی
خط چهار نقطه پروب، مقاومت الکتریکی، تقویت، بتن آرمه، وضعیت خوردگی میلگرد، معادله باتلر-والمر،
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
چکیده انگلیسی
The surface resistivity of concrete with and without reinforcement was measured in the laboratory. Uncarbonated and carbonated concrete specimens were investigated corresponding to a passive and active state of corrosion, respectively. The concrete was water saturated, so the measurement medium was considered to be homogeneous. The measurements were performed directly over the rebar on reinforced specimens in order to minimize boundary effects. The presence of a rebar, with the resulting short-circuit effect due to the large differences of resistivity between concrete and steel, strongly reduced the measured resistivity. The magnitude of this reduction increased as the rebar reached a more active state. Other parameters influencing the short circuit effect, particularly concrete cover depth and concrete resistivity, were studied experimentally as well as numerically. The measurement results were inverted through a numerical simulation using COMSOL Multiphysics software. The Butler-Volmer relation was used to characterise the charge exchange at the steel-concrete interface. This inversion process determined the real resistivity of concrete as well as the electrochemical parameters of the embedded reinforcing steel bar. The methodology combining both measurement and inversion is relevant to evaluate the corrosion state of reinforcement. By comparing the electrochemical parameters of a passive and active rebar, the corrosion state can be determined with the proposed methodology.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Construction and Building Materials - Volume 171, 20 May 2018, Pages 455-466
نویسندگان
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