تأثیر ناحیه انتقال بر خواص و ریزساختار بتن‌ بازیافتی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری، گروه عمران، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران

2 استاد، گروه عمران، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران

3 عضو هیات علمی گروه عمران دانشگاه صنعتی جندی شاپور دزفول

10.22124/jcr.2025.27918.1665

چکیده

در پژوهش حاضر، تأثیر ناحیه انتقال بر خواص مکانیکی، دوام و ریزساختار بتن‌های بازیافتی ساخته شده از سنگدانه‌های بتن بازیافتی و سرباره درشت فولاد ارزیابی گردید. سنگدانه‌های بتن بازیافتی و سرباره به‌ترتیب به‌میزان %25، %50 ، %100 و %25 و %50 جایگزین سنگدانه‌های درشت طبیعی شدند و همین‎طور میکروسیلیس به‌میزان %5 و %10 جایگزین بخشی از سیمان مصرفی در ساخت بتن با نسبت آب به مواد سیمانی 45/0 گردید. به‌منظور بررسی تأثیر ناحیه انتقال بر خواص مکانیکی، دوام و ریزساختار بتن‌ها، ۲۱ طرح اختلاط ساخته شدند و با روش تاگوچی ۱۰ طرح انتخاب و مجموعا 800 نمونه در محدودة سنی ۷ تا ۱۸۰ روزه بررسی گردیدند. نتایج نشان داد که با افزایش میزان میکروسیلیس، خواص مکانیکی بهبود یافته و به‌تبع آن کاهش در جذب آب غوطه‌وری، نفوذ آب تحت‌فشار و نفوذ تسریع‌شده یون کلراید و افزایش قابل‌توجه در مقاومت الکتریکی نمونه‌ها رخ داده ‌است. هم‌چنین در میزان فاز بلوری هیدروکسید کلسیم و تعداد منافذ بزرگ کاهش و در فاز سیلیکات کلسیم هیدراته ناحیه انتقال افزایش حاصل شد که این منجر به بهبود کیفیت ریزساختار گردید. با افزایش سن نمونه‌ها، فازهای سیلیکات کلسیم هیدراته و هیدروکسید کلسیم به ترتیب %22 افزایش و %41 کاهش و به‌تبع آن مقاومت فشاری و مقاومت ویژه الکتریکی به ترتیب %30 و %460 افزایش و نفوذ تسریع یون کلراید %72 کاهش پیدا کرد. بررسی محدودة 50 میکرومتری از مرز سنگدانه با طیف‌سنجی انرژی اشعه ایکس نشان داد که در فاصله 20 میکرومتری، بیشترین همبستگی بین نسبت‌های عناصر ناحیه انتقال با خواص بتن برقرار می‌شود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

The effect of transition zone on the properties and micro-structure of recycled concrete

نویسندگان [English]

  • Seyed Ghasem Mirahmadi 1
  • Seyed Fathollah Sajedi 2
  • Seyed Vahid Razavi Toosi 3
1 PhD candidate, Department of Civil Engineering, Ahvaz Branch, Islami Azad University, Ahvaz, Iran
2 Professor, Department of Civil Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
3 Jundi Shapor University of Technology
چکیده [English]

In the current study, the effect of the Interfacial transition zone on the mechanical properties, durability and microstructure of recycled concrete made from recycled concrete aggregates and coarse steel slag was evaluated.Recycled concrete aggregates replaced with natural coarse aggregates by 25%, 50%, 100%, and slag by 25% and 50%, respectively, and microsilica by 5% and 10% replaced with a part of cement used in concrete using the w/c as 0.45.In order to investigate the effect of ITZ on the mechanical properties, durability and microstructure of concrete, 21 mixing designs were made and 10 designs were selected using the Taguchi method and a total of 800 samples aged between 7 and 180 days were examined. Increasing microsilica improved mechanical properties, reduced water absorption and penetration, increased chloride resistance, and enhanced electrical resistance in samples. Also, the amount of crystalline phase of calcium hydroxide and the number of large pores decreased, and the hydrated calcium silicate phase of the transition region increased, which led to Enhanced microstructure quality. As the samples age increased, hydrated calcium silicate phase increased by 22% and calcium hydroxide phase decreased by 41%; as a result, the compressive strength and specific electrical resistance increased by 30% and 460%, respectively, and the chloride ion acceleration penetration decreased by 72%; examining the 50 µm limit from the aggregate boundary with X-ray energy spectroscopy showed that at a distance of 20 µm, the highest correlation between the ratios of elements in the transition zone with concrete properties is established.

کلیدواژه‌ها [English]

  • Interfacial Transition Zone
  • Properties of recycled concrete
  • Microstructure
  • Spectroscopy
  • X-ray
  • Atomic ratio of elements
  • Scanning Electron Micrograph (SEM)

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