کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
186339 459611 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Macro and micro aspects of the transport of chlorides in cementitious membranes
ترجمه فارسی عنوان
ماکرو و میکرو روابط انتقال کلرید ها در غشاهای سیمانی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی


• Macroscopic (EIS) and microscopic (SECM) techniques were combined to study the flux of chlorides in cementitious membranes.
• The transport of chlorides occurs mainly through pores of sub-micrometre equivalent diameter.
• An explanation for the beneficial effect of the AC current in the transport of chlorides is given.
• The SECM study evidences the dynamic behaviour of the transport of chlorides.

A study of the transport of chlorides through hardened Portland cement paste membranes is reported. The flux of chlorides was induced by migration (AC and DC fields) and diffusion.Two parallel studies were developed. A macroscopic one where the migration of chlorides was followed by Electrochemical Impedance Spectroscopy (EIS) and a microscopic one in which the natural diffusion was investigated using the scanning electrochemical microscopy (SECM). Both studies have revealed to be complementary. The local investigations performed with the SECM were successfully employed for the interpretation of the EIS data.The results have shown that the transport of chlorides occurs mainly through pores of sub-micrometre equivalent diameter. The study of the transition time has allowed to conclude that the diffusion coefficient approaches the usual value obtained in bulk solution. The macroscopic study has allowed presenting an explanation for the beneficial effect of the AC current in the transport of chlorides. A possible method for estimating the flux of chlorides from the percolation resistance is also discussed.

Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 124, 1 April 2014, Pages 61–68
نویسندگان
, , , ,