مقایسه مقاومت ضربه‌ای بتن قلیافعال و بتن معمولی تحت حرارت بالا بر اساس آزمون XRD و SEM

نوع مقاله : مقاله پژوهشی

نویسندگان

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

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

3 استادیار، گروه مهندسی عمران، دانشگاه آزاد اسلامی، واحد لاهیجان، لاهیجان، ایران

چکیده

در چند دهه اخیر سازه‌ها به لحاظ پدافندی در مواجهه با بلایای طبیعی و مصنوعی، از اهمیت ویژه‌ای برخوردار بوده‌اند. لذا نیاز به ساخت سازه‌هایی با استحکام بالا از دغدغه‌های مهندسان در این حوزه بوده است. بتن به‌عنوان یکی از مصالح اصلی مصرفی در سازه‌های بتنی، دارای نقش مؤثری در بهبود و ارتقای استحکام سازه‌ها است. مقاومت بتن در برابر ضربات وزنه افتان به‌عنوان یکی از خواص مکانیکی بتن شناخته می‌شود. در این پژوهش آزمایشگاهی، یک طرح اختلاط از بتن معمولی با عیار سیمان 450 کیلوگرم بر متر مکعب ساخته شد، یک طرح اختلاط نیز از بتن قلیافعال بر پایه سرباره­کوره ­آهن گدازی ساخته شد تا میزان مقاومت ضربه‌ای بتن از نوع وزنه افتان تحت دمای محیط و حرارت 500 درجه سلسیوس، در سن عمل­آوری 90 روزه مورد مقایسه و ارزیابی قرار گیرد. در ادامه، آزمون‌های طیف سنجی پراش اشعه ایکس (XRD) و تصاویر میکروسکوپ الکترونی روبشی (SEM) به‌منظور بررسی بیشتر و راستی آزمایی نتایج آزمون مقاومت ضربه‌ای، در سن عمل­آوری 90 روزه در دمای محیط و تحت حرارت 500 درجه سلسیوس بر روی نمونه‌ها انجام گرفت. در بخش نتایج، میزان انرژی جذب شده در آزمون ضربه‌ای وزنه افتان در دمای محیط، برای بتن معمولی به مقدار 24/244 ژول و برای بتن قلیافعال به مقدار 89/223 ژول کسب گردید، که این مقادیر تحت اعمال حرارت بالا در بتن، به ترتیب به مقدار 9/90 و 72/72 درصد افت را از خود نشان داد. میزان شاخص انعطاف­پذیری در این آزمون تحت دمای محیط، برای بتن معمولی به مقدار 33/2 ژول و برای بتن قلیافعال به مقدار 58/1 ژول کسب گردید، که تحت حرارت بالا در بتن، به ترتیب به مقدار 75/28 درصد بهبود و 49/9 درصد افت را نشان داد. نتایج حاصل از آزمون‌های XRD و SEM ضمن هماهنگی با یکدیگر، در همپوشانی با نتایج حاصل از آزمون مقاومت ضربه‌ای قرار داشت.

کلیدواژه‌ها


عنوان مقاله [English]

Comparing the Impact Strength of Alkali Activated Concrete and Normal Concrete Under High Heat Based on XRD and SEM Tests

نویسندگان [English]

  • mohammadhossein mansourghanaei 1
  • morteza biklaryan 2
  • Alireza Mardookhpour 3
1 Ph.D Student 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
3 department of civil engineering islamic azad university lahijan branch iran
چکیده [English]

In recent decades, structures have been of special importance in terms of defense against natural and man-made disasters. Therefore, the need to build structures with high strength has been one of the concerns of engineers in this field. Concrete as one of the main materials used in concrete structures, has an effective role in improving and enhancing the strength of structures. Concrete resistance to falling weight is known as one of the mechanical properties of concrete. In this laboratory research, a mixing design was made of ordinary concrete with a cement grade of 450 kg / m3. 500 degrees Celsius, compared and evaluated at 90 days of processing age. Next, X-ray diffraction (XRD) spectroscopy and scanning electron microscopy (SEM) tests were performed to further evaluate and validate the impact resistance test results at 90 days of processing time at ambient temperature and 500 ° C. Samples were taken. In the results section, the amount of energy absorbed in the impact test of weight drop at ambient temperature was 244.24 joules for ordinary concrete and 223.89 joules for quilted concrete, which were subjected to high heat application in concrete. They showed a decrease of 90.9% and 72.72%, respectively. The flexibility index in this test under ambient temperature was 2.33 joules for ordinary concrete and 1.58 joules for reinforced concrete, which under high heat in concrete, improved by 28.75%, respectively. They showed a drop of 9.49%. The results of XRD and SEM tests were in coordination with each other and overlapped with the results of impact resistance test.
 

کلیدواژه‌ها [English]

  • Alkali Active Concrete
  • Blast Furnace Slag
  • Drop Weight
  • X-Ray Diffraction (XRD) Spectroscopy
  • Scanning Electron Microscope (SEM)

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