بررسی رفتار و دوام‌ یخ زدگی بتن سنگین دارای ژل نانو سیلیس و پودر ایلمنیت در نسبت‌های مختلف حجمی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناس ارشد مهندسی عمران گرایش سازه، دانشکده مهندسی، دانشگاه آزاد اسلامی‌‌واحد سپیدان، فارس، ‌ایران

2 استادیار، دانشکده مهندسی، دانشگاه آزاد اسلامی ‌‌واحد سپیدان، فارس، ‌ایران

3 مربی، گروه مهندسی عمران، دانشکده مهندسی، دانشگاه فنی و حرفه‌ای، تهران، ایران

4 استادیار، دانشکده مهندسی عمران، دانشگاه آزاد اسلامی واحد فیروزآباد مرکز میمند، میمند، ایران

چکیده

اساساً بتن با وزن مخصوص حدود 5/1 تا 5/2 برابر بتن معمولی بتن سنگین تلقی می‌شود. برای ساخت بتن سنگین از مصالحی با وزن مخصوص بالا به جای بخشی از سنگدانه در بتن استفاده می‌شود. بتن سنگین به عنوان سپر محافظ در مقابل تشعشعات به کار مى‌رود و اصولاً در سازه‌ تاسیسات اتمى و‌ یا بیمارستان‌ها مورد استفاده قرار می‌گیرد. ایلمنیت یک نوع ماده معدنی است که بعنوان زباله معدنی هم از آن یاد می‌شود. ایلمنیت بطور مستقیم از معدن تیتانیوم استخراج می‌گردد و به وفور در ایران ‌یافت می‌شود. در این تحقیق برای ساخت بتن سنگین از ایلمنیت در نسبت‌های مختلف حجمی ‌10%، 20%، 30%، 40% به جای ماسه استفاده شده است. همچنین جهت افزایش کیفیت و دوام بتن در برابر چرخه ذوب و انجماد از ژل نانو سیلیس به میزان 1% وزنی سیمان استفاده شده است. آزمایشات انجام شده در این تحقیق شامل مقاومت فشاری، مقاومت کششی، جذب آب اولیه و ثانویه، تعیین دوام ذوب و انجماد مطابق با استاندارد ASTM-C666 می‌باشد. نتایج این تحقیق نشان داد که حداقل افزودن 20% ایلمنیت به جای ماسه در بتن، باعث قرار گیری وزن مخصوص بتن سنگین در زمره ضوابط آیین نامه‌ای خواهد شد. همچنین افزودن 30% حجمی ایلمنیت به جای ماسه، تا 33% میزان مقاومت فشاری نهایی (90روزه) را افزایش خواهد داد. در نهایت افزودن ژل نانو سیلیس در ترکیب بتن سنگین باعث گردید تا رفتار بتن در برابر چرخه ذوب و انجماد از پایداری مطلوبی برخوردار گردد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Studying the Behavior and the Freezing Endurance of Heavy Concrete with Nano-Silica Gel and Ilmenite Powder in Different Volume Ratios

نویسندگان [English]

  • Mohammad Javad Homayoun 1
  • Roozbeh Aghamajidi 2
  • Amirhossein Bazaee 3
  • babak mansouri 4
1 Master of Civil Engineering, Faculty of Engineering, Islamic Azad University, Sepidan Unit, Fars, Iran
2 Assistant Professor, Faculty Of Engineering, Islamic Azad University, Sepidan Unit, Fars, Iran
3 Instructor, Department Of Civil Engineering, Technical And Vocational University (TVU), Tehran, Iran
4 Assistant Professor, Faculty Of Civil Engineering, Islamic Azad University, Firoozabad Branch, Meymand Center, Meymand, Iran
چکیده [English]

Basically, heavy concrete has the specific weight of about 1.5 to 2.5 times of the normal concrete. Materials with high specific weight are employed as a part of used aggregate to make heavy concrete. Heavy concrete is utilized as a protective shield against radiation. Heavy concrete is applied in the structure of nuclear infrastructures or hospitals. Ilmenite is a type of mineral that is also considered as mineral waste. Ilmenite is extracted directly from titanium mine and is found plentifully in Iran. In this study, Ilmenite is used in different volume ratios of 10%, 20%, 30%, and 40% instead of sand to make heavy concrete. Moreover, nano-silica gel, is used at the rate of 1% by weight of cement, to increase the quality and durability of concrete against the cycle of melting and freezing. The tests performed in this research include compressive strength test, tensile strength test, defining the primary and secondary water absorption rate and determination of concrete melting and freezing durability, according to ASTM-C666 standard. Results depicted that, the specific weight of heavy concrete would meet the regulations, by adding at least 20% of ilmenite instead of sand in concrete mixture. Also, adding 30% by volume of ilmenite, instead of sand, will increase the final compressive strength (90 days) by 33%. Finally, applying nano-silica gel in the heavy concrete mixture, makes the concrete stable against the melting and freezing cycles.

کلیدواژه‌ها [English]

  • Heavy Concrete
  • Durability Freezing
  • Ilmenite
  • Titanium Oxide
  • Nano Silica Gel

مراجع

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  • تاریخ دریافت: 05 اردیبهشت 1401
  • تاریخ بازنگری: 14 آذر 1401
  • تاریخ پذیرش: 13 دی 1401

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