Effect of Silane and Silicate based Penetrants against Corrosion of Steel with Partial Cover Thickness
محل انتشار: ژورنال مهندسی عمران، دوره: 9، شماره: 12
سال انتشار: 1402
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 17
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شناسه ملی سند علمی:
JR_CEJ-9-12_002
تاریخ نمایه سازی: 2 اردیبهشت 1403
چکیده مقاله:
The partial cover thickness of reinforced concrete structures near the coastline enhances the early corrosion onset, which reduces the service life. As a countermeasure under the preventive maintenance approach, to delay early corrosion onset in structures with partial cover thickness and increase durability throughout the service life, this study used silane and silicate-based surface penetrants. Mortar specimens with a partial cover thickness and embedded, specially segmented bars were prepared. Both penetrants were applied to specimens with partial cover thicknesses (۲۰ and ۷.۵ mm). Further, electrochemical methods such as macrocell current, microcell current, electric resistivity, and potentiodynamic polarization curves were used to assess the corrosion resistance before and after coating. The penetration depth of silane was measured visually, and the Vickers hardness test was used for the silicate penetrant. The “equivalent cover approach” was adopted to evaluate the performance of penetrants throughout their service lives. Results revealed that the total corrosion current density decreased by ۷۹% for specimens coated with silane and ۵۲% for silicate penetrant, whereas no change was observed in the uncoated specimens. Based on the equivalent cover approach, the silane penetrant was determined to be most effective in delaying the corrosion onset and propagation time for cover thicknesses of ۶۰ and ۵۰ mm at ۱۰۰ m distance against ۷۰ mm, and for ۴۰ and ۳۰ mm against ۵۰ mm at ۲۵۰ m from the coastline. Further, the silicate-based penetrant was only effective for a deficient cover thickness of ۵ mm against the specified cover thicknesses at a distance of ۱۰۰ and ۲۵۰ m from the sea coast. Doi: ۱۰.۲۸۹۹۱/CEJ-۲۰۲۳-۰۹-۱۲-۰۲ Full Text: PDF
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