افزایش عملکرد بتن با نانوذرات اکسید گرافن سنتز شده و سیلیکا

نوع مقاله : مقاله پژوهشی

نویسنده

عضو هیئت علمی دانشگاه پدافند هوایی خاتم الانبیاء (ص) ایران

10.22124/jcr.2025.27381.1660

چکیده

تأثیر تخلخل بتن بر جذب آب و پایداری محصولات سیمانی دارای اهمیت بالایی است. نفوذپذیری بتن اجازه ورود مولکول های واکنش پذیر را می دهد که می تواند باعث از دست دادن پایداری شیمیایی بتن شود. بتن با نفوذپذیری کم، مقاومت در برابر نفوذ آب، یون های سولفات، یون های کلرید وآلاینده دیگر را افزایش می دهد. این خاصیت مربوط به ساختار منافذ است. از جمله ترک های کوچک در فضاهای تماس بین سنگدانه و ملات سیمان. به اصطلاح ساختار منفذی شامل منافذ مویرگی است که حجم و اندازه های مختلفی دارند. این ساختار حاصل واکنش هیدراتاسیون سیمان است و از مواد جامد و منافذ تشکیل شده است. شبکه متخلخل خمیر سیمان ماتریس لازم برای نفوذ مایع به داخل بتن را تشکیل می دهد. توسعه این شبکه تحت تاثیر خواص بتن، شرایط آب بندی اولیه، مدت زمان آن، سن آزمایش و شرایط آب و هوا است. دما، زمان پردازش و رطوبت نیز از عوامل مهم موثر بر ساختار منافذ هستند. در این پژوهش از اکسید گرافن و نانوذرات سیلیس برای مقاوم ساختن بتن نانوکامپوزیت در برابر نفوذ استفاده شد. نتایج نشان دادند که با افزودن 05/0 درصد نانو ذرات اکسید گرافن و 10 درصد نانو ذرات سیلیکا، مقاومت فشاری و کششی بتن به ترتیب 6/28 و 35 درصد افزایش یافت. همچنین، در آزمایش‌های جذب آب، نمونه تولیدی تا 46 درصد کمتر آب جذب کرد و مقاومت الکتریکی آن 79 درصد بیشتر بود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Increasing concrete performance with synthesized graphene oxide nanoparticles and silica

نویسنده [English]

  • Seyed Ali Hosseini Moradi
Faculty of Basic Sciences, Department of Physics, faculty member of Khatam al-Anbia Air Defense University (PBUH) of Iran
چکیده [English]

The effect of concrete porosity on water absorption and stability of cement products is very important. The permeability of concrete allows the entry of reactive molecules that can cause the concrete to lose its chemical stability. Concrete with low permeability increases the resistance to the penetration of water, sulfate ions, chloride ions and other pollutants. This property is related to the pore structure. including small cracks in the contact spaces between aggregate and cement mortar. The so-called pore structure includes capillary pores that have different volumes and sizes. This structure is the result of the cement hydration reaction and consists of solid materials and pores. The porous network of cement paste forms the matrix necessary for liquid penetration into the concrete. The development of this network is influenced by concrete properties, initial sealing conditions, its duration, test age and weather conditions. Temperature, processing time and humidity are also important factors affecting the pore structure. In this research, graphene oxide and silica nanoparticles were used to make nanocomposite concrete resistant to penetration. The results showed that by adding 0.05% of graphene oxide nanoparticles and 10% of silica nanoparticles, the compressive and tensile strength of concrete increased by 28.6% and 35%, respectively. Also, in water absorption tests, the manufactured sample absorbed 46% less water and its electrical resistance was 79% higher.

کلیدواژه‌ها [English]

  • concrete
  • graphene oxide
  • silica
  • mechanical resistance
  • water absorption
  • electrical resistance
  • nano composite concrete

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