بررسی تأثیر استفاده از انواع مختلف فوق روان‌کننده بر مشخصات فیزیکی و مکانیکی ملات‌های سیمانی حاوی اکسید گرافن و روباره کوره بلند آهن‌گدازی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، گروه مهندسی عمران، واحد فومن و شفت، دانشگاه آزاد اسلامی، فومن، ایران

2 استادیار گروه مهندسی عمران، واحد فومن و شفت، دانشگاه آزاد اسلامی، فومن، ایران.

3 مربی گروه مهندسی عمران، دانشگاه فنی و حرفه ای، تهران، ایران

10.22124/jcr.2024.27771.1664

چکیده

یکی از انواع نانوموادی که اثرات تقویت کنندگی آن بر مخلوط های سیمانی در تحقیقات اخیر مشاهده شده است، اکسید گرافن می باشد. با این وجود، پخش شوندگی یکنواخت و پایدار این نانوصفحات در کامپوزیت های سیمانی، موردی است که استفاده از آن را به چالشی جدی تبدیل کرده است. یکی از روش های پیشنهادی به منظور پخش یکنواخت اکسید گرافن، استفاده از افزودنی های فوق روان کننده و پوزولان ها می باشد. لذا این مطالعه به ارزیابی تاثیر استفاده از انواع مختلف فوق روان کننده بر مشخصات فیزیکی و مکانیکی ملات های سیمانی حاوی اکسید گرافن و روباره کوره بلند آهن گدازی می پردازد. در این راستا، مخلوط هایی حاوی درصد های مختلف از روباره و اکسیدگرافن و سه نوع مختلف از فوق روان کننده ساخته شده و با هدف ارزیابی مشخصات فیزیکی و مکانیکی و همچنین، تاثیر نوع روان کننده مصرفی بر این مشخصات، در سنین مختلف تحت آزمایش قرار گرفتند. نتایج حاکی از آن است که استفاده از اکسید گرافن به میزان 05/0 درصد وزنی بهترین عملکرد را از حیث اصلاح خواص فیزیکی و مکانیکی به همراه داشته است. از سویی دیگر، با حضور روباره در اختلاط، استفاده از اکسید گرافن به میزان 03/0 درصد وزن مصالح سیمانی منجر به بهبود مشخصات ملات های حاصل گردید. همچنین، استفاده از فوق روان کننده لیگنو-کربوکسیلات در اختلاط با و بدون حضور روباره منجر به بروز مشخصات مقاومتی بالاتر گردید که این امر می تواند گواهی بر پخش مناسب تر و پایداری بیشتر نانوصفحات اکسید گرافن در ماتریس سیمانی باشد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

An investigation on the Effects of Superplasticizer Type on Physical and Mechanical Properties of Cement Mortars Containing Graphene Oxide and Ground-Granulated Blast Furnace Slag

نویسندگان [English]

  • Hossein Taslimi Kharratmahalleh 1
  • Miralimohammad Mirgozar Langeroudi 2
  • Hamidreza Hosseinzadeh 1
  • Seyyed Mojtaba Ostovar Chomachaei 3
1 MSc Student, Department of Civil Engineering, Fouman and Shaft Branch, Islamic Azad University, Fouman, Iran
2 Department of Civil Engineering, Fouman and Shaft Branch, Islamic Azad University, Fouman, Iran
3 Department of Civil Engineering, Technical and Vocational University (TVU), Tehran, Iran.
چکیده [English]

Graphene oxide (GO) is a nanomaterial that has recently demonstrated promising reinforcing effects in cementitious composites. However, the uniform and stable dispersion of GO nanosheets within these composites remains a significant challenge. One proposed approach to achieve uniform GO dispersion is to utilize superplasticizers and pozzolans. This study evaluates the influence of different superplasticizers on the physical and mechanical properties of cement mortars containing GO and blast furnace slag (BFS). Mortar mixtures were prepared with varying GO and BFS content and three distinct superplasticizers. The physical and mechanical properties of these mortars were assessed at different ages to investigate their characteristics and the influence of superplasticizer type. The results indicate that the addition of 0.05 wt% GO yielded the most significant improvements in physical and mechanical properties. Furthermore, the incorporation of 0.03 wt% GO in BFS-containing mixtures led to enhanced mortar characteristics. Additionally, using a lignosulfonate-based superplasticizer with and without BFS resulted in superior strength properties. This suggests a more effective dispersion and enhanced stability of GO nanosheets within the cement matrix.

کلیدواژه‌ها [English]

  • Cement Mortar
  • Graphene Oxide
  • Ground Granulated Blast-Furnace Slag
  • Physical and Mechanical Properties
  • SEM

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