بررسی عملکرد بلوک سبک هوادار اتوکلاو شده حاوی نانوگرافن

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد سازه، دانشکده مهندسی عمران، دانشگاه پیام نور واحد تهران شمال، تهران، ایران.

2 پژوهشگر پسادکتری سازه، دانشکده مهندسی عمران، دانشگاه صنعتی شریف

3 استادیار، دانشکده مهندسی عمران، دانشگاه پیام نور واحد تهران شمال، تهران، ایران

4 مدیر کارخانه بنای سبک قدس رضوی قرچک، تهران، ایران.

5 مدیرعامل شرکت کارخانجات بنای سبک قدس رضوی، تهران، ایران.

چکیده

مقاومت فشاری و کششی پایین، جذب آب بالای بلوک سبک هوادار اتوکلاو شده که سبب جذب آب ملات شده و همچنین مقاومت پایین در برابر ضربه، از مشکلات فنی و اجرایی استفاده از آن در پروژه‌های ساختمانی است. بدین منظور، در این مقاله به کمک افزودن نانوگرافن با مقادیر 0/2،0/4 و 0/8 درصد جایگزینی سیمان در بلوک و تحت آزمایش‌های مقاومت فشاری و کششی (نمونه‌های استوانه‌ای به قطر 10 و ارتفاع 20 سانتی‌متر)، ضربه (نمونه‌های مکعبی به بعد 15 سانتی‌متر)، جذب آب (نمونه‌های مکعبی به بعد 15 سانتی‌متر)، SEM و XRD سعی شده است خواص ذکر شده بهبود یابند. بر اساس نتایج به دست آمده، با افزودن نانوگرافن به ترکیب بلوک سبب افزایش مقاومت فشاری و کششی و ضربه تا 45، 81 و 130 درصد نسبت به نمونه شاهد شده است. همچنین افزودن نانوگرافن سبب کاهش 61 درصدی میزان جذب آب گردیده است. همچنین نتایج حاصل از آزمایش‌های ریزساختار بر روی نمونه‌ها بیانگر این است که وجود نانوگرافن در ترکیب بلوک، سبب ایجاد ساختاری مستحکم بین اجزا شده و اندازه ذرات تا 30 درصد ریزتر شده است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

A Study of Mechanical and Microstructures Properties of Autoclaved Aerated Concrete Containing Nano-Graphene

نویسندگان [English]

  • fazel seddighi 1
  • ghasem pachideh 2
  • seyyedeh behnoush salim bahrami 3
  • ferdos ahmadi 4
  • seyyed jamaleddin mousavi mashhadi 5
1 MSC, student, Faculty of Civil Engineering, Payame Noor University, North Tehran Branch, Tehran, Iran.
2 Postdoctoral Research Assistant, Civil Faculty, Sharif University of Technology
3 Assistant Professor, Faculty of Civil Engineering, Payame Noor University, North Tehran Branch, Tehran, Iran.
4 Manager of Quds Razavi Qarchak Lightweight Building Factory, Tehran, Iran
5 Managing Director of Ghods Razavi Lightweight Construction Factories Company, Tehran, Iran.
چکیده [English]

In recent years, autoclaved aerated concrete (AAC) has been widely used in the building construction industry, especially for the construction of infill walls. However, the AAC suffers from several drawbacks such as low compressive and tensile strength, high water absorption as well as insufficient resistance against impacts. To address such issues, this study evaluates the mechanical properties of the AAC blocks in which, the cement has been replaced with nano-graphene. For this purpose, various replacement ratios (0.2, 0.4, and 0.8) were selected and different tests such as compressive and tensile strength (cylindrical specimens with the size of 10×20cm), impact resistance and water absorption (cubic specimens), scanning electron microscope (SEM) and X-ray diffraction (XRD) were carried out. Promisingly, the results indicate that incorporation of the nano-graphene improves the compressive and tensile strength as well as the impact resistance by 45, 81, and 130% compared to the control specimen. Moreover, the water absorption of the specimens was reduced up to 61%. Based on the SEM results, the inclusion of the NG in the AAC, makes the grains stick together firmly and also, downsizes the grains by 30%.   

کلیدواژه‌ها [English]

  • Autoclaved Aerated Concrete (AAC)
  • Nano-Graphene
  • Tensile and Compressive Strength
  • Water Absorption
  • Impact Resistance
  • Scanning Electron Microscope (SEM)
  • X-ray diffraction (XRD)

مراجع

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نشریه مهندسی عمران امیرکبیر
دوره 54، شماره 6
شهریور 1401
صفحه 2129-2150

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