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ارزیابی مقاومت فشاری و نفوذپذیری بتن مسلح به گرافناکساید با به به کارگیری نتایج حاصل از روش "محفظه استوانهای" | ||
| نشریه مهندسی عمران امیرکبیر | ||
| مقاله 12، دوره 55، شماره 2، اردیبهشت 1402، صفحه 471-490 اصل مقاله (2.49 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/ceej.2023.18722.6941 | ||
| نویسندگان | ||
| مهنا صفرخانی؛ محمود نادری* | ||
| دانشکده فنی و مهندسی، دانشگاه بینالمللی امام خمینی (ره)، قزوین، ایران | ||
| چکیده | ||
| نفوذپذیری را می توان از مؤثرترین عوامل کنترل کننده مقاومت و دوام بتن دانست. نفوذپذیری آب در مواد سیمانی تحت تأثیر عوامل داخلی شامل نوع شبکه بندی متخلخل مواد سیمانی و عوامل خارجی از جمله فشار اعمالی است. در پژوهش حاضر تأثیر گرافن اکساید بر میزان جذب آب اولیه و ثانویه ملات سیمان، اثر اعمال فشار هیدرواستاتیکی بر نفوذپذیری بتن مسلح به گرافن اکساید (GO) در دو جهت بتن ریزی و عمود بر آن با به کارگیری روش "محفظه استوانه ای" و همچنین تأثیر این نانو ذرات بر مقاومت فشاری و ناهمسانگردی مقاومت نمونه های بتنی بررسی شده است. یکی از دلایل مهم عدم استفاده از گرافن در کامپوزیت های سیمانی، آبگریز بودن آن بوده که باعث توزیع نامناسب گرافن در ساختار می گردد. خواص آبگریزی گرافن به واسطه پروسه عامل دار کردن شیمیایی و یا پوشش فیزیکی می تواند به خواص آبدوستی تبدیل شود. نتایج نشان می دهد که افزودن مقدار کمی گرافن اکساید می تواند باعث کاهش در جذب آب موئینه ملات سیمان و همچنین کاهش در میزان نفوذپذیری بتن در دو جهت بتن ریزی و عمود بر آن شود. در واقع با افزودن این نانو ذرات می توان مشخصه های انتقال آب در بتن و متعاقب آن دوام بتن را بهبود بخشید. همچنین نتایج مقاومت فشاری بتن حاکی از آن است که استفاده از این ذرات در مخلوط بتن می تواند باعث افزایش در مقاومت فشاری و کاهش ناهمسانگردی در مقاومت نسبت به نمونه کنترل شود. این موضوع را می توان به دلیل جهت گیری تصادفی ورقهای گرافن اکساید در حجم بتن دانست. | ||
| کلیدواژهها | ||
| گرافناکساید؛ نفوذپذیری؛ فشار هیدرواستاتیکی؛ جهت بتنریزی؛ ناهمسانگر | ||
| موضوعات | ||
| تست های آزمایشگاهی؛ تکنولوژی بتن-نانوساختار؛ دوام بتن؛ مصالح نوین جهت اصلاح خواص بتن | ||
| عنوان مقاله [English] | ||
| Evaluation of the compressive strength and permeability of graphene oxide-reinforced concrete by using the results of the cylindrical chamber method | ||
| نویسندگان [English] | ||
| mahna safarkhani؛ Mahmood Naderi | ||
| Imam Khomeini International University | ||
| چکیده [English] | ||
| Water permeability in cement materials is influenced by internal factors, including the type of porous network of cement materials, and external factors, including applied pressure. In this study, the effect of graphene oxide on the compressive strength and anisotropy of the concrete samples and also the effect of applying hydrostatic pressure on the permeability of concrete reinforced with graphene oxide (GO) have been investigated. One of the important reasons for not using graphene in cement composites is its hydrophobicity, which causes the inappropriate distribution of graphene in the structure. The hydrophobic properties of graphene can be converted into hydrophilic properties through the process of chemical functionalization or physical coating. The results of the compressive strength of concrete indicate that the use of these particles in the concrete mixture can increase the compressive strength and reduce the anisotropy in the strength compared to the control sample. This issue can be considered due to the random orientation of graphene oxide sheets in the volume of concrete. The results also show that the addition of a small amount of graphene oxide can reduce the permeability of concrete. In fact, by adding these nanoparticles, it is possible to improve the characteristics of water transfer in concrete and subsequently the durability of it. | ||
| کلیدواژهها [English] | ||
| Graphene oxide (GO), Anisotropy, Compressive strength, Durability, Unsaturated water transport | ||
| مراجع | ||
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