بررسی و تولید محلول گرافنی به منظور افزایش مقاومت مکانیکی مخلوط‌های سیمانی

صمیمی, کیانوش; پاکان, مهیار

doi:10.30478/jcsm.2023.369056.1300

بررسی و تولید محلول گرافنی به منظور افزایش مقاومت مکانیکی مخلوط‌های سیمانی

نوع مقاله : مقاله پژوهشی

نویسندگان

¹ استادیار، دانشکده مهندسی عمران، آب و محیط‌زیست، دانشگاه شهید بهشتی، تهران، ایران.

² دانشجوی دکتری، دانشکده مهندسی عمران، آب و محیط‌زیست، دانشگاه شهید بهشتی، تهران، ایران.

10.30478/jcsm.2023.369056.1300

چکیده

استفاده از افزودنی‌های مختلف به‌منظور افزایش دوام و مقاومت مکانیکی بتن از رویکردهای نوین در تکنولوژی بتن است. گرافن به دلیل خواص منحصر‌به‌فرد آن مورد توجه بوده است. با این حال پدیده انباشتگی گرافن در مخلوط‌های سیمانی و هزینه تولید بالا کاربرد آن را در صنعت ساخت بتن با چالش مواجه کرده است. برای این منظور، استفاده از یک عامل پخش‌کننده گرافن در ساختار سیمان ضروری است. در این تحقیق، از سورفکتانت به‌منظور پخش صفحات گرافن در ساختار سیمانی استفاده شد. این روش موجب تولید محلول ارزان به نسبت روش‌های متداول شده است که می‌تواند به‌عنوان افزودنی مورد استفاده قرار بگیرد.
نتایج حاصل این تحقیقات نشان داد که محلول سورفکتانت می‌تواند خواص مکانیکی را در سنین اولیه افزایش دهد. با بررسی دقیق ریزساختار به‌وسیله آنالیز FESEM مشاهده شد که ترکیبات حاوی 56/0 گرم در لیتر سورفکتانت ساختار متراکم‌تری نسبت نمونه شاهد دارند و همچنین مقاومت فشاری خمیر سیمانی نیز به میزان 66/28٪ نسبت به نمونه شاهد در سن 7 روز افزایش داشته است. آنالیزهای TGA و XRD نشان می‌دهد که گرافن نقش مؤثر در هسته‌زایی داشته است و موجب تولید محصولات CH و C-S-H در ساختار سیمان شده است. این محلول می‌تواند به‌عنوان ماده افزودنی نوین در بسیار از پروژه‌های عمرانی مورد استفاده قرار گیرد.

کلیدواژه‌ها

موضوعات

تکنولوژی بتن

عنوان مقاله [English]

Investigation and production of Graphene Solution in order to Increase the Mechanical Strength of Cement Mixtures

نویسندگان [English]

kianoosh samimi ¹
Mahyar Pakan ²

¹ Assistance Professor, Faculty of Civil, Water and Environmental Engineering, Shahid Beheshti University, Tehran, Iran.

² Ph.D. Student, Faculty of Civil, Water and Environmental Engineering, Shahid Beheshti University, Tehran, Iran.

چکیده [English]

Using different additives in order to increase the durability and mechanical resistance of concrete is one of the new approaches in concrete technology. In recent years, graphene has attracted attention due to its unique properties. However, the phenomenon of graphene accumulation in cement mixtures and high production costs have challenged its application in the concrete industry. For this purpose, it is necessary to use a graphene dispersing agent in the cement structure. This research used surfactants to spread graphene sheets in cement structures. This method has resulted in producing a cheap solution compared to typical methods, which can be used as an additive. The results of this research showed that the surfactant solution can increase mechanical properties at early ages. Detailed microstructure examination by FESEM analysis showed that the compounds containing 0.56 g/l of surfactant have a denser structure than the control sample, and also the compressive strength of the cement paste increased by 28.66% compared to the control sample at the age of 7 days. TGA and XRD analyses show that graphene played an effective role in nucleation and produced CH and C-S-H products in the cement structure. This solution can be used as a new additive in many construction projects.

کلیدواژه‌ها [English]

Microstructure
Surfactant
Graphene
Graphite
Compressive Strength

مراجع

[1] Samimi, K., Farahani, M., Pakan, M. and Shirzadi Javid, A.A. (2022) ,Influence of Pumice and Metakaolin on Compressive Strength and Durability of Concrete in Acidic Media and on Chloride Resistance under Immersion and Tidal Conditions. Iranian Journal of Science and Technology - Transactions of Civil Engineering, Springer. Vol. 46, pp. 1153–75.

[2] Samimi, K. and Shirzadi Javid, A.A. (2020) ,Magnesium Sulfate (MgSO4) Attack and Chloride Isothermal Effects on the Self-consolidating Concrete Containing Metakaolin and Zeolite. Iranian Journal of Science and Technology - Transactions of Civil Engineering, Springer. pp. 1–16.

[3] Pachideh, G., Gholhaki, M., Moshtagh, A. and Felaverjani, M.K. (2019) ,An investigation on the effect of high temperatures on the mechanical properties and microstructure of concrete containing multiwalled carbon nanotubes. Materials Performance and Characterization, ASTM International. Vol. 8, pp. 503–17.

[4] Pachideh, G., Gholhaki, M. and Moshtagh, A. (2019) ,On the post-heat performance of cement mortar containing silica fume or Granulated Blast-Furnace Slag. Journal of Building Engineering, Elsevier. Vol. 24, pp. 100757.

[5] Li, X., Lu, Z., Chuah, S., Li, W., Liu, Y., Duan, W.H. et al. (2017) ,Effects of graphene oxide aggregates on hydration degree, sorptivity, and tensile splitting strength of cement paste. Composites Part A: Applied Science and Manufacturing, Elsevier. Vol. 100, pp. 1–8.

[6] Gong, K., Pan, Z., Korayem, A.H., Qiu, L., Li, D., Collins, F. et al. (2015) ,Reinforcing Effects of Graphene Oxide on Portland Cement Paste. Journal of Materials in Civil Engineering, American Society of Civil Engineers. Vol. 27, pp. A4014010.

[7] Wang, Q., Wang, J., Lu, C.X., Liu, B.W., Zhang, K. and Li, C.Z. (2015) ,Influence of graphene oxide additions on the microstructure and mechanical strength of cement. Xinxing Tan Cailiao/New Carbon Materials, Elsevier. Vol. 30, pp. 349–56.

[8] Du, H. and Pang, S.D. (2015) ,Enhancement of barrier properties of cement mortar with graphene nanoplatelet. Cement and Concrete Research, Elsevier. Vol. 76, pp. 10–9.

[9] Lotya, M., King, P.J., Khan, U., De, S. and Coleman, J.N. (2010) ,High-concentration, surfactant-stabilized graphene dispersions. ACS Nano, ACS Publications. Vol. 4, pp. 3155–62.

[10] Feneuil, B., Pitois, O. and Roussel, N. (2017) ,Effect of surfactants on the yield stress of cement paste. Cement and Concrete Research, Elsevier. Vol. 100, pp. 32–9.

[11] Sobolkina, A., Mechtcherine, V., Khavrus, V., Maier, D., Mende, M., Ritschel, M. et al. (2012) ,Dispersion of carbon nanotubes and its influence on the mechanical properties of the cement matrix. Cement and Concrete Composites, Elsevier. Vol. 34, pp. 1104–13.

[12] Samimi, K., Pakan, M. and Eslami, J. (2023) ,Investigating the compressive strength and microstructural analysis of mortar containing synthesized graphene and natural pozzolan in the face of alkali-silica reactions. Journal of Building Engineering, Elsevier. Vol. 68, pp. 106126.

[13] Peyvandi, A., Soroushian, P., Balachandra, A.M. and Sobolev, K. (2013) ,Enhancement of the durability characteristics of concrete nanocomposite pipes with modified graphite nanoplatelets. Construction and Building Materials, Elsevier. Vol. 47, pp. 111–7.

[14] Liu, J., Fu, J., Yang, Y. and Gu, C. (2019) ,Study on dispersion, mechanical and microstructure properties of cement paste incorporating graphene sheets. Construction and Building Materials, Elsevier. Vol. 199, pp. 1–11.

[15] Wang, Y.Y., Zhao, L. and Zhao, J. (2021) ,Effects of Submicron Metakaolin on Hydration and Compressive Strength of Portland Cement Slurry. KSCE Journal of Civil Engineering, Springer. Vol. 25, pp. 2631–9.

[16] Yaseen, S.A., Yiseen, G.A. and Li, Z. (2019) ,Elucidation of Calcite Structure of Calcium Carbonate Formation Based on Hydrated Cement Mixed with Graphene Oxide and Reduced Graphene Oxide. ACS Omega, ACS Publications. Vol. 4, pp. 10160–70.

[17] Qureshi, T.S. and Panesar, D.K. (2020) ,Nano reinforced cement paste composite with functionalized graphene and pristine graphene nanoplatelets. Composites Part B: Engineering, Elsevier. Vol. 197, pp. 108063.

[18] Yang, H., Monasterio, M., Cui, H. and Han, N. (2017) ,Experimental study of the effects of graphene oxide on microstructure and properties of cement paste composite. Composites Part A: Applied Science and Manufacturing, Elsevier. Vol. 102, pp. 263–72.

[19] Chen, Z., Zhou, X., Wang, X. and Guo, P. (2018) ,Mechanical behavior of multilayer GO carbon-fiber cement composites. Construction and Building Materials, Elsevier. Vol. 159, pp. 205–12.