تاثیر شدت‌های مختلف میدان مغناطیسی بر میزان خوردگی آرماتور در بتن حاوی میکروسیلیس در محیط خورنده

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری سازه، دانشکده فنی، دانشگاه گیلان، رشت، ایران

2 استاد گروه مهندسی عمران، دانشکده فنی، دانشگاه گیلان، رشت، ایران

3 دکتری سازه، دانشکده فنی، دانشگاه گیلان، رشت، ایران

4 پسادکتری سازه، دانشکده فنی، دانشگاه گیلان، رشت، ایران

10.22124/jcr.2025.30949.1706

چکیده

با توجه به آن که اعمال مستقیم میدان مغناطیسی به بتن در حالت تازه موجب بهبود خواص مهندسی آن می‌شود، انتظار می‌رود پدیده مغناطیس بتواند بر دوام بتن در محیط‌های خورنده نیز تأثیرگذار باشد. از آنجا که مطالعات مؤثری در خصوص میزان خوردگی آرماتور در بتن تحت میدان مغناطیسی انجام نشده است، پژوهش حاضر به بررسی اثرات اعمال شدت‌های مختلف میدان مغناطیسی شامل 5/0، 8/0 و 1 تسلا به بتن حاوی ۵ و ۱۰ درصد میکروسیلیس بر خواص مکانیکی و دوام آن می‌پردازد. همچنین ریزساختار بتن تحت میدان مغناطیسی با استفاده از تصاویر میکروسکوپ الکترونی روبشی (SEM) ارزیابی گردید. نتایج مطالعه حاضر نشان داد که اعمال مستقیم میدان مغناطیسی با شدت 1 تسلا به بتن حاوی 10 درصد میکروسیلیس می‌تواند میزان خوردگی آرماتور مدفون در آن را تا 17 درصد کاهش دهد. همچنین عملکرد فشاری بتن تحت میدان مغناطیسی تا حدود 24 درصد بهبود می‌یابد. از طرفی میزان جذب آب نهایی و تخلخل بتن تحت میدان مغناطیسی به ترتیب تا 14 و 18 درصد کاهش یافت. تحلیل SEM نمونه‌های بتن نیز نشان داد که القای مغناطیسی بتن با اثرگذاری بر فرایند هیدراتاسیون مواد سیمانی بر میزان ژل کلسیم سیلیکات هیدراته می‌افزاید.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Effect of different magnetic field intensities on the corrosion of steel rebar embedded in concrete incorporating silica fume, exposed to corrosive environment

نویسندگان [English]

  • Fakhri Javahershenas 1
  • Malek Mohammad Ranjbar 2
  • Morteza Sohrabi Gilani 3
  • Mohammad Hajforoush 4
1 Ph.D. Student in Structural Eng., Faculty of Engineering, University of Guilan, Rasht, Iran
2 Prof. in Structural Eng., Faculty of Engineering, University of Guilan, Rasht, Iran
3 Ph.D., Faculty of Engineering, University of Guilan, Rasht, Iran
4 Postdoctoral in Structural Eng., Faculty of Engineering, University of Guilan, Rasht, Iran
چکیده [English]

Since direct application of a magnetic field to fresh concrete improves its engineering properties, magnetic treatment is also expected to enhance the durability of concrete in a corrosive environment. Given the limited research on steel rebar corrosion rates in magnetically treated concrete, this study investigates the effects of different magnetic field intensities (0.5, 0.8, and 1 T) on the mechanical properties and durability of concrete containing 5% and 10% silica fume. Furthermore, the microstructure of magnetically treated concrete was evaluated using Scanning Electron Microscopy (SEM) images. The results demonstrated that applying a 1 T magnetic field to concrete incorporating 10% silica fume reduced embedded steel rebar corrosion by up to 17%. In addition, compressive strength of concrete exposed to magnetic field of 1 T increased by about 24%. Additionally, final water absorption and porosity of the concrete decreased by up to 14% and 18%, respectively. The SEM analysis revealed that magnetic field exposure affects the hydration process of cement materials, increasing the amount of calcium silicate hydrate (C-S-H) gel.

کلیدواژه‌ها [English]

  • Magnetic field
  • Concrete
  • Silica fume
  • Rebar corrosion
  • SEM

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