مطالعه رفتاری خصوصیات مکانیکی و ریزساختار بتن حاوی سرباره فولاد در معرض دمای زیاد

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار، دانشکده فنی، دانشگاه هرمزگان. استادیار دانشکده فنی مرودشت، دانشگاه فنی و حرفه‌ای

2 دانشجوی کارشناسی ارشد مهندسی عمران، دانشگاه آزاد اسلامی واحد بندرعباس

3 دانشجوی دکتری مهندسی عمران، دانشگاه خوارزمی

چکیده

حرارت چه در حالت گذرا چه در حالت پایدار موجب تغییر در خصوصیات فیزیکی و شیمیایی بتن می‌شود. از سوی دیگر استفاده از سرباره به همراه سیمان پرتلند بر توسعه ریزساختار بتن تأثیرگذار است.. محصولات اصلی فرآیند هیدراتاسیون خمیر سیمان و سرباره که نقش مهمی در افزایش مقاومت بتن دارد، نانوساختارهای هیدرات سیلیکات کلسیم (C-S-H) و هیدرات آلومینوفریت کلسیم (C-A-Fe-H) است. بر این اساس به‌منظور درک عمیق‌تر از تغییر رفتار نانوساختارهای C-S-H و C-A-Fe-H براثر اعمال درجه حرارت‌های زیاد، بتن حاوی درصدهای مختلف سرباره فولاد در این مقاله مورد بررسی قرارگرفته است. در این راستا حدود 150 نمونه مکعبی بتن با جایگزینی صفر، 5%، 10%، 15% و 20% سرباره فولاد به سیمان پرتلند به مدت 28 روز در حمام رطوبت عمل‌آوری شده است. سپس همه آزمونه‌ها به مدت 1 ساعت در دماهای 25 تا 800 درجه سلسیوس قرارگرفته است. درصد تغییرات وزنی، مقاومت فشاری و رفتار ترک‌خوردگی در تمام آزمونه‌ها موردبررسی قرارگرفته است. برای ارزیابی رفتار ریزساختاری آزمونه‌ها در دماهای مختلف از تصاویر میکروسکوپ الکترونیکی روبشی (SEM) و طیف‌سنجی پراکندگی انرژی پرتوایکس (EDS) استفاده شد. بر اساس نتایج پژوهش حاضر ماهیت رفتار آزمونه‌های بتنی وابسته به تغییرات نانوساختارهای C-S-H و C-A-Fe-H تحت دمای زیاد است. مقاومت فشاری نمونه‌های حاوی 5 تا 15 درصد سرباره فولاد نسبت به نمونه بتن معمولی افزایش داشتند. دلیل این افزایش بر اساس تصاویر SEM تراکم بیشتر نانوساختارهای C-S-H و C-A-Fe-H و هیدروکسید آهن FeO(OH) است.

کلیدواژه‌ها

عنوان مقاله [English]

Studying the Mechanical Properties and Microstructure of Concrete Containing Steel Slang exposed to High Temperature

نویسندگان [English]

  • mohammad amiri 1
  • Afshin . Vatanpour Aghjeh Mashhad 2
  • Marziyeh Aryanpour 2
  • Sedigheh Ghasemi 3
1 Assistant Professor, University of Hormozgan, Faculty of Engineering, Bandar Abbas, Iran
2 Master Student, Islamic Azad University of Bandar Abbas, Faculty of Engineering
3 PhD Student, Kharazmi University, Faculty of Engineering, Tehran, Iran
چکیده [English]

Heat, both in transient and steady state, changes the physical and chemical properties of concrete. In addition, the use of slag with Portland cement is very effective on development of concrete microstructure. The main products of hydration process are cement paste and slag, which plays important role in increasing concrete strength, C-S-H and C-A-Fe-H microstructures. Based on this, this paper has focused on the concrete containing varying degrees of steel slag in order to get a deeper perception of the changing behavior of C-S-H and C-A-Fe-H due to being exposed to high temperature. In this regard, 150 cubic samples of concrete with zero, 5%, 10%, 15% and 20% replacement of steel slag to Portland cement were treated for 28 days in a moisture bath. Then, all samples were exposed for 1 hour to 25 to 800 ºC. The percentage of weight change, compressive strength and cracking behavior of samples were investigated. Furthermore, in order to evaluate the microstructural behavior of test samples in different temperatures, SEM photos and EDS were used. Based on the results, the behavior of concrete samples depends on the variations of C-S-H and C-A-Fe-H microstructures under high temperature. The compressive strength of samples containing 5 to 15% steel slag increased as compared to conventional concrete sample. Based on SEM photos, the reason for this increase is higher density of C-S-H and C-A-Fe-H microstructures and FeO(OH).

کلیدواژه‌ها [English]

  • Steel Slang
  • High Temperature
  • Compressive Strength
  • SEM

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