مقایسه مدول‌الاستیسیته بتن قلیافعال روسازی و بتن معمولی تحت دمای بالا براساس آزمون‌های XRD و SEM

نوع مقاله : مقاله پژوهشی

نویسندگان

1 ‌‌دکتری تخصصی عمران سازه، گروه مهندسی عمران، واحد چالوس، دانشگاه آزاد اسلامی، چالوس، ایران

2 گروه مهندسی عمران، دانشگاه آزاد اسلامی، واحد چالوس، چالوس، ایران

چکیده

در دهه­های اخیر، به­کارگیری مصالح  قلیایی در بتن به دلیل خواص پوزولانی و وجود مواد آلومینوسیلیکاتی با خواص پرکنندگی و چسبندگی زیاد، چشم­انداز گسترده­ای در صنعت بتن پیدا کرده است. به­کارگیری این نوع بتن (با توجه به مزایای برتر نسبت به بتن معمولی) در روسازی راه­ها می­تواند موجب بهبود استحکام و افزایش عمر مفید راه­ها گردد. در این پژوهش آزمایشگاهی، یک نسبت مخلوط از بتن معمولی با عیار سیمان 450 کیلوگرم بر متر مکعب ساخته شد. یک نسبت مخلوط نیز از بتن قلیافعال بر پایه سرباره­کوره­آهنگدازی ساخته شد تا میزان مدول­الاستیسیته بتن تحت دمای محیط و دمای 500 درجه سلسیوس، در سن عمل­آوری 90 روزه مورد مقایسه و ارزیابی قرار گیرد. در ادامه، طیف­سنجی پراش اشعه­­ایکس (XRD) و تصاویر میکروسکوپ الکترونی روبشی (SEM) به­منظور بررسی بیشتر و راستی آزمایی نتایج حاصل از آزمون مدول­الاستیسیته، در سن عمل­آوری 90 روزه در دمای محیط و تحت دمای 500 درجه سلسیوس روی نمونه­های بتنی انجام گرفت. مدول­الاستیسیته در دمای محیط، برای بتن معمولی به مقدار 32 گیگاپاسکال و برای بتن قلیافعال به مقدار 35 گیگاپاسکال به­دست آمد که اختلاف 8 درصدی داشتند. با اعمال حرارت بالا به نمونه­های بتنی، میزان افت مدول­الاستیسیته در بتن معمولی به مقدار 59 درصد و در بتن قلیافعال به­میزان 42 درصد رسید. نتایج XRD و SEM ضمن هماهنگی با یکدیگر، در همپوشانی با نتایج حاصل از آزمون مدول­الاستیسیته قرار گرفتند.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Comparison of modulus-elasticity of pavement alkali-activated concrete and normal concrete under high temperature Based on XRD and SEM test

نویسندگان [English]

  • Mohammadhossein Mansourghanaei 1
  • Morteza Biklaryan 2
1 Ph.D. in Civil Engineering, Department of Civil Engineering, Chalous Branch, Islamic Azad University, Chalous, Iran
2 Department of Civil Engineering, Chalous Branch, Islamic Azad University, Chalous, Iran
چکیده [English]

In recent decades, the use of alkaline materials in concrete has found a wide perspective in the concrete industry due to its pozzolanic properties and the presence of aluminosilicate materials with high filling and adhesion properties. The use of this type of concrete (due to its superior advantages over ordinary concrete) in paving roads can improve the strength and increase the useful life of roads. In this laboratory research, a mixture ratio of normal concrete with a cement grade of 450 kg/m3 was made. A mixture ratio was also made of activated alkali concrete based on blast furnace slag to compare and evaluate the modulus of elasticity of concrete under ambient temperature and heat of 500 ℃, at the age of 90 days. Next, X-ray Diffraction Spectroscopy (XRD) and Scanning Electron Microscope (SEM) tests were carried out in order to further investigate and verify the results of the modulus of elasticity test, at the processing age of 90 days at ambient temperature and It was done on concrete samples under the heat of 500 ℃. The modulus of elasticity at ambient temperature was 32 GPa for ordinary concrete and 35 GPa for activated alkali concrete, which had a difference of 8%. By applying heat to concrete samples, the amount of modulus of elasticity drop in normal concrete reached 59% and in activated alkali concrete 42%. The results of the XRD and SEM tests were in agreement with each other and overlapped with the results of the modulus of elasticity test.

کلیدواژه‌ها [English]

  • Active Alkali Concrete
  • Blast Furnace Slag
  • Concrete Modulus of Elasticity
  • X-Ray Diffraction (XRD)
  • Scanning Electron Microscopy (SEM)

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  • تاریخ دریافت: 17 آذر 1400
  • تاریخ بازنگری: 16 مهر 1401
  • تاریخ پذیرش: 21 مهر 1401

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