کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
261348 503694 2007 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Frost attack resistance and steel bar corrosion of antiwashout underwater concrete containing mineral admixtures
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
پیش نمایش صفحه اول مقاله
Frost attack resistance and steel bar corrosion of antiwashout underwater concrete containing mineral admixtures
چکیده انگلیسی

This study aims to evaluate frost durability and steel-bar corrosion in antiwashout-underwater concrete, which has been neglected to date. To achieve this goal, repeated freezing and thawing and accelerated steel-bar corrosion tests have been performed for three types of antiwashout-underwater concrete specimens.The results of repeated freezing and thawing test reveal that adding mineral admixtures has little effects on frost durability because of the large and uneven entrapped-air imprisoned by the cellulose-type antiwashout-underwater admixture. Slight improvement of frost durability was observed through the action of air-entrained (AE) agent in the case of SG50 which presented an air content of 6 ± 0.5%.Measurement results using the half-cell potential showed that, among the entire specimens, steel-bar in Control specimen manufactured under artificial seawater was the first one that exceeded the threshold value, −350 mV proposed by ASTM C 876, at 14 cycles, where the corresponding corrosion current density and concentration of water soluble chloride were measured as 0.3 μA/cm2 and 0.258%, respectively. For the other specimens, potential values became below −350 mV later than 18 cycles.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Construction and Building Materials - Volume 21, Issue 1, January 2007, Pages 98–108
نویسندگان
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