بررسی و مقایسه تاثیر میکروسیلیس و نانوسیلیس بر خواص رئولوژی و مکانیکی بتن

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشیار، گروه عمران، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران

2 دانشجوی کارشناسی ارشد، گروه عمران، واحد اهواز، دانشگاه آزاداسلامی، اهواز، ایران

10.22124/jcr.2024.21928.1567

چکیده

سوابق نشان می‌دهد که با جایگزینی میکروسیلیس و نانوسیلیس، خواص مکانیکی بتن بهبود می‌یابند. در این تحقیق سیمان با میکروسیلیس در %5 و %10 جایگزین گردید؛ ملاحظه شد که جایگزینی باعث بهبود خواص مکانیکی بتن شد که این بهبود در جایگزینی %10 نتایج بهتری داشته است. سیمان با نانوسیلیس در %5/0، %1 و %5/1 جایگزین و سه طرح اختلاط تهیه شدند. در طرح‌های حاوی نانوسیلیس، افزایش مقاومت فشاری بیش‌تر از طرح‌های حاوی میکروسیلیس بود. بهترین نتایج مربوط به طرح حاوی %5/1 نانوسیلیس بود. برای بهبود بیش‌تر خواص مکانیکی و کاهش مصرف سیمان، طرح اختلاط‌های ترکیبی (%5 و %5/0)، (%5 و %1) و (%10 و %5/1) نیز ساخته شدند. برای آزمایش مقاومت فشاری سه نمونه مکعبی استاندارد در هر سن و هر طرح اختلاط و برای آزمایش‌های مقاومت کششی دو نیم‌شدن و ضریب ارتجاعی استاتیکی دو نمونه استوانه‌ای استاندارد، و در مجموع 117 نمونه‌ تهیه گردید. بر نمونه‌های عمل‌آوری شده در آب، در سنین 7، 28 و 91 روزه آزمایش مقاومت فشاری انجام شد. آزمایش‌های مقاومت کششی دونیم شدن و ضریب ارتجاعی استاتیکی بر نمونه‌های عمل‌آوری شده در آب، در سن 28 روزه انجام شدند. جایگزینی همزمان بخشی از سیمان با میکروسیلیس و نانوسیلیس در درصدهای کم بهبود قابل‌توجهی نسبت به استفاده جداگانه آنها را نتیجه داد. طرح %10 میکروسیلیس و %5/1 نانوسیلیس به عنوان طرح بهینه تعیین و معرفی می‌شود. در طرح بهینه افزایش مقاومت-های فشاری و کششی دو نیم‌‌شدن و ضریب ارتجاعی استاتیکی در سن 28 روزه نسبت به طرح مرجع به ترتیب %70، %115 و %29 بوده‌اند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigation and comparison of the effect of microsilica and nanosilica on the rheological and mechanical properties of concrete

نویسندگان [English]

  • Seyed Fathollah Sajedi 1
  • Elmira Heidari 2
1 Associate professor, Department of Civil Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
2 M.Sc. student, Department of Civil Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
چکیده [English]

Research records show that the replacement of microsilica and nanosilica improves the mechanical properties of concrete. Cement was replaced with microsilica at 5% and 10%; it was observed that the replacement improved the mechanical properties of concrete, which resulted in 10% better results. Cement was replaced with nanosilica in 0.5%, 1% and 1.5% and three mixes were prepared. In designs containing nanosilica, the increase in compressive strength was greater than in designs containing microsilica. The best results were related to the design containing 1.5% nanosilica. To further improve the mechanical properties and reduce cement consumption, the mixes (5%, 0.5%), (5%, 1%) and (10%, 1.5%) were also made. For compressive strength test, three standard cubic specimens were prepared at each age and each mixing design, and for split cylinder test and static modulus of elasticity, two standard cylindrical specimens were prepared, for a total of 117 specimens. Compressive strength tests were performed on water-cured specimens at 7, 28 and 91 days of age. Split cylinder and modulus of elasticity tests, were performed on water-cured specimens at 28 days of age. Simultaneous replacement of some cement with microsilica and nanosilica in small percentages resulted in a significant improvement over their separate use. 10% microsilica and 1.5% nanosilica design are determined and introduced as the optimal design. In the optimal design, the increase in compressive strength and split cylinder test as well as modulus of elasticity at the age of 28 days were 70%, 115% and 29%, respectively, compared to the reference design.

کلیدواژه‌ها [English]

  • Slump
  • Compressive strength
  • Split cylinder test
  • Static modulus of elasticity
  • Microsilica
  • Nanosilica
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