بررسی مقاومت و دوام یخ‌‌زدگی بتن سبک با نسبت‌‌های وزنی مختلف نانو مونت موریلونیت و میکروسیلیس

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی عمران، واحد فیروزاباد، مرکز میمند، دانشگاه آزاد اسلامی، میمند، ایران

2 دانشکده مهندسی، دانشگاه آزاد اسلامی ‌‌واحد شیراز، فارس،‌ ایران

3 گروه مهندسی معماری و شهرسازی، دانشگاه فنی و حرفه‌ای، تهران، ایران

4 گروه مهندسی عمران، دانشگاه فنی و حرفه‌ای، تهران، ایران

چکیده

یکی از روش‌‌های موثر برای کاهش وزن مخصوص بتن استفاده از پوکه‌‌ معدنی به جای سنگدانه می‌باشد که می‌‌تواند وزن مخصوص بتن را کاهش دهد. اما با توجه به تخلخل بالای پوکه‌‌ معدنی، مقاومت و دوام بتن کاهش یافته و باعث افزایش میزان نفوذپذیری آن می‌‌شود. در حالیکه می‌‌توان با استفاده از نانو مواد برخی از معایب بتن را بطور ویژه‌‌ اصلاح نمود. نانو مونت موریلونیت با جذب آب به سرعت متورم شده و افزایش حجم می‌‌دهد. ‌این خاصیت باعث افزایش تراکم در بتن سبک می‌شود. در‌ این تحقیق برای ساخت بتن سبک از پوکه معدنی قروه و جهت افزایش تراکم آن از نانو مونت موریلونیت در نسبت‌های مختلف وزنی 0/5%، 1%، 1/5%، 2%، 2/5% سیمان استفاده شد. همچنین برای افزایش کیفیت و کاهش هزینه مصالح مصرفی، از میکروسیلیس به میزان 10% وزنی عیار سیمان مصرفی در بتن استفاده شد. آزمایش‌‌های انجام شده شامل مقاومت فشاری، مقاومت کششی، جذب آب در بتن سخت شده، دوام در برابر چرخه یخ‌‌زدگی، شاخص اقتصادی و بررسی ریزساختار بتن می‌‌باشد. نتایج‌ این تحقیق نشان داد که استفاده از 2/5% نانو مونت موریلونیت بجای سیمان به همراه 10% میکروسیلیس در بتن سبک می‌‌تواند مقاومت فشاری 90 روزه را تا 65% نسبت به نمونه کنترل افزایش دهد. اما با توجه به هزینه بالای تهیه نانو مواد، میزان بهینه استفاده از نانو مونت موریلونیت در بتن سبک حداکثر 1/5% تعیین گردید. زیرا افزودن مقادیر بیش از آن تاثیر محسوسی در افزایش مقاومت فشاری و کششی بتن نداشته و شکست بتن عمدتاً از ناحیه سبک‌دانه‌‌ رخ می‌‌دهد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigating the Freezing Strength and Durability of Lightweight Concrete With Different Weight Ratios of Nano Montmorillonite and Microsilica

نویسندگان [English]

  • babak mansoori 1
  • Hamed Yousefinezhad 2
  • Farhad Avaznejad 3
  • amirhossein bazaee 4
1 Assistant Professor, Department of Civil Engineering, Firoozabad Branch, Meymand center, Islamic Azad University, Meymand, Iran
2 Department of Engineering, Shiraz Branch, Islamic Azad University, Shiraz, Iran
3 Instructor, Department Of Architecture And Urban Planning, Technical And Vocational University (TVU), Tehran, Iran
4 Instructor, Department Of Civil Engineering, Technical And Vocational University (TVU), Tehran, Iran
چکیده [English]

One of the effective ways to reduce the specific weight of concrete is to use mineral pumice instead of aggregate, which can reduce the specific weight of concrete. However, due to the high porosity of mineral pumice, the strength and durability of concrete decrease and increase its permeability. While some of the disadvantages of concrete can be specially corrected by using nanomaterials. Nano montmorillonite quickly swells and increases its volume by absorbing water. This property increases density in lightweight concrete. In this research, to make lightweight concrete from mineral pumice, and to increase its density, nano montmorillonite was used in different weight ratios of 0.5%, 1%, 1.5%, 2%, and 2.5% cement. Also, to increase the quality and reduce the cost of consumable materials, micro silica was used in the amount of 10% by weight of the grade of cement used in concrete. The conducted tests include compressive strength, tensile strength, water absorption in hardened concrete, durability against the freezing cycle, economic index, and examination of concrete microstructure. The results of this research showed that the use of 2.5% nano montmorillonite instead of cement along with 10% micro silica in lightweight concrete can increase the 90-day compressive strength by 65% compared to the control sample. But due to the high cost of preparing nanomaterials, the optimal amount of using nano montmorillonite in lightweight concrete was determined to be 1.5% maximum. Because adding amounts more than that has no noticeable effect on increasing the compressive and tensile strength of concrete and the failure of concrete mainly occurs in the light-grained area.

کلیدواژه‌ها [English]

  • Light concrete
  • freezing cycle
  • nano montmorillonite
  • microsilica
  • mineral pumice

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نشریه مهندسی عمران امیرکبیر
دوره 55، شماره 11
بهمن 1402
صفحه 2263-2284

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