عملکرد نانوصفحات گرافن ‌اکساید بر دیسپرسیون نانوذرات اکسید سیلیس و تأثیر آن بر خصوصیات مکانیکی ملات سیمانی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی عمران، دانشگاه صنعتی امیرکبیر، تهران، ایران

2 دانشکده مهندسی عمران، دانشگاه علم و صنعت ایران، تهران، ایران

چکیده

در مطالعه حاضر مکانیزم رسوب‌گذاری نانوذرات اکسید سیلیس (NS) بر روی نانو صفحات گرافن ‌اکساید (GO) از طریق هیدرولیز تترا ارتو سیلیکات (TEOS) در محلول آب و الکل و عملکرد آن در ملات سیمانی مورد بررسی قرار گرفته ‌است. در بخش اول این پژوهش نحوه برهم‌کنش‌های احتمالی مابین نانوذرات، به کمک طیف‌سنج پرتوهای مرئی (Uv-Vis) و میکروسکوپ الکترونی عبوری (TEM) و در بخش دوم به خصوصیات مکانیکی ماده کامپوزیت متشکل از نانو‌سیلیس و گرافن ‌اکساید (NS&GO) توسط تکنیک شبیه‌سازی دینامیک مولکولی پراخته شده است. در نهایت کاربرد نانوذرات به ‌صورت منفرد و کامپوزیت در ملات سیمانی و تأثیرات آن بر خصوصیات مکانیکی ملات‌های حاوی پوزولان‌های طبیعی و فاقد آن مورد ارزیابی و مقایسه قرار گرفت. بهبود دیسپرسیون ذرات نانوسیلیس بر روی صفحات گرافن ‌اکساید بدون استفاده از سورفکتانت‌ها در تصاویر TEM قابل رؤیت است. همچنین نتایج شبیه‌سازی دینامیک مولکولی افزایش 75 درصدی مقدار تنش قابل تحمل و افزایش 250 درصدی مدول یانگ ماده کامپوزیت نسبت به نانوسیلیس منفرد را نشان می‌دهد. مقاومت فشاری و کششی 28 روزه ملات‌های حاوی کامپوزیت نانومواد نیز به ترتیب با افزایش 31% و 100% نسبت به طرح کنترل همراه بوده است. در یک نتیجه‌گیری کلی دیسپرسیون و توزیع مناسب نانوذرات، خاصیت هسته‌زایی نانوسیلیس، خاصیت پل‌زنی گرافن ‌اکساید در کنار فعالیت بالای پوزولان‌ زئولیت موجب عملکرد مناسب ملات ZNS&GO گردیده ‌است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Performance of Graphene Oxide nanosheets on the dispersion of nano SiO2 and its effect on the mechanical properties of cement mortar

نویسندگان [English]

  • Aliakbar Ramezanianpor 1
  • Mohammad Mahdi Zaeri Amirani 2
  • Sajjad Mirvalad 2
1 Department of Civil and Environmental Engineering, Amirkabir University of Technology, Tehran, Iran
2 School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran
چکیده [English]

In the present study, the sedimentation mechanism of SiO2 nanoparticles (NS) on Graphene Oxide (GO) nanosheets by hydrolysis of Tetra Ortho Silicate (TEOS) in water/ethanol solution was investigated. In the first part, the possible interactions among nanoparticles by UV-Vis and Transmission Electron Microscopy (TEM), and in the second part, the mechanical properties of nanocomposite materials contain NS and GO (NS&GO) by molecular dynamic simulation (MDS) were discussed. Finally, the application of single and hybrid nano materials on 12 kinds of the mixture of mortars containing natural pozzolan was compared with mechanical properties. the improvement of dispersion of NS on GO nanosheets was visible in TEM. Also, the results of MDS demonstrate 75% increase in tolerable stress and 250% increase in Young’s modulus in nanocomposite compared with single nano-SiO2. 28-day compressive and tensile strength mortars containing NS&GO increased by 31% and 100%, respectively and compared with the control. As a result, appropriate dispersion and distribution of nanoparticles, NS&GO through nucleation properties, and zeolite through pozzolanic properties improved the mechanical function of mortars.

کلیدواژه‌ها [English]

  • Graphene Oxide
  • NanoSiO2
  • Natural Pozzolans
  • Mechanical properties
  • Molecular dynamics simulations
[1] I. Odler, Hydration, setting and hardening of Portland cement, Lea's Chemistry of cement and concrete,  (1998).
[2] L. Turanli, B. Uzal, F. Bektas, Effect of large amounts of natural pozzolan addition on properties of blended cements, Cement and concrete research, 35(6) (2005) 1106-1111.
[3] N. Lushnikova, L. Dvorkin, Sustainability of gypsum products as a construction material, in:  Sustainability of Construction Materials, Elsevier, 2016, pp. 643-681.
[4] R. Rodrıguez-Camacho, R. Uribe-Afif, Importance of using the natural pozzolans on concrete durability, Cement and concrete research, 32(12) (2002) 1851-1858.
[5] M. Shannag, High strength concrete containing natural pozzolan and silica fume, Cement and concrete composites, 22(6) (2000) 399-406.
[6] A.A. Ramezanianpour, S. Mirvalad, E. Aramun, M. Peidayesh, Effect of four Iranian natural pozzolans on concrete durability against chloride penetration and sulfate attack, in:  Proceedings of the 2nd international conference on sustainable construction materials and technology, 2010, pp. 28-30.
[7] M. Najimi, J. Sobhani, B. Ahmadi, M. Shekarchi, An experimental study on durability properties of concrete containing zeolite as a highly reactive natural pozzolan, Construction and building materials, 35 (2012) 1023-1033.
[8] K. Samimi, S. Kamali-Bernard, A.A. Maghsoudi, Durability of self-compacting concrete containing pumice and zeolite against acid attack, carbonation and marine environment, Construction and building materials, 165 (2018) 247-263.
[9] P. Madhuri, B.K. Rao, A. Chaitanya, Improved performance of concrete incorporated with natural zeolite powder as supplementary cementitious material, Materials Today: Proceedings, 47 (2021) 5369-5378.
[10] M. Liu, H. Tan, X. He, Effects of nano-SiO2 on early strength and microstructure of steam-cured high volume fly ash cement system, Construction and Building Materials, 194 (2019) 350-359.
[11] A. Nazari, S. Riahi, RETRACTED: The effects of SiO2 nanoparticles on physical and mechanical properties of high strength compacting concrete, in, Elsevier, 2011.
[12] A.N. Givi, S.A. Rashid, F.N.A. Aziz, M.A.M. Salleh, Experimental investigation of the size effects of SiO2 nano-particles on the mechanical properties of binary blended concrete, Composites Part B: Engineering, 41(8) (2010) 673-677.
[13] M. Ltifi, A. Guefrech, P. Mounanga, A. Khelidj, Experimental study of the effect of addition of nano-silica on the behaviour of cement mortars, Procedia engineering, 10 (2011) 900-905.
[14] A. Guefrech, P. Mounanga, A. Khelidj, Experimental study of the effect of addition of nano-silica on the behaviour of cement mortars Mounir, Procedia Engineering, 10 (2011) 900-905.
[15] E. Shamsaei, F.B. de Souza, X. Yao, E. Benhelal, A. Akbari, W. Duan, Graphene-based nanosheets for stronger and more durable concrete: A review, Construction and Building Materials, 183 (2018) 642-660.
[16] H. Peng, Y. Ge, C. Cai, Y. Zhang, Z. Liu, Mechanical properties and microstructure of graphene oxide cement-based composites, Construction and Building Materials, 194 (2019) 102-109.
[17] W. Li, X. Li, S.J. Chen, Y.M. Liu, W.H. Duan, S.P. Shah, Effects of graphene oxide on early-age hydration and electrical resistivity of Portland cement paste, Construction and Building Materials, 136 (2017) 506-514.
[18] M. Mokhtar, S. Abo-El-Enein, M. Hassaan, M. Morsy, M. Khalil, Mechanical performance, pore structure and micro-structural characteristics of graphene oxide nano platelets reinforced cement, Construction and Building Materials, 138 (2017) 333-339.
[19] H. Liu, Y. Yu, H. Liu, J. Jin, S. Liu, Hybrid effects of nano-silica and graphene oxide on mechanical properties and hydration products of oil well cement, Construction and Building Materials, 191 (2018) 311-319.
[20] J. Lin, E. Shamsaei, F.B. de Souza, K. Sagoe-Crentsil, W.H. Duan, Dispersion of graphene oxide–silica nanohybrids in alkaline environment for improving ordinary Portland cement composites, Cement and Concrete Composites, 106 (2020) 103488.
[21] C. ASTM, Standard specification for standard sand, in:  American Society for, 2013.
[22] A. Standard, ASTM C109-standard test method for compressive strength of hydraulic cement mortars, ASTM International, West Conshohocken, PA,  (2008).
[23] A. Designation, C307-03 (Reapproved 2012) Standard Test Method for Tensile Strength of Chemical-Resistant Mortar, Grouts, arid Monolithic Surfacings,  (2012).
[24] S. Plimpton, Fast parallel algorithms for short-range molecular dynamics, Journal of computational physics, 117(1) (1995) 1-19.
[25] A. Stukowski, Visualization and analysis of atomistic simulation data with OVITO–the Open Visualization Tool, Modelling and simulation in materials science and engineering, 18(1) (2009) 015012.
[26] S.H. Hahn, J. Rimsza, L. Criscenti, W. Sun, L. Deng, J. Du, T. Liang, S.B. Sinnott, A.C. Van Duin, Development of a ReaxFF reactive force field for NaSiO x/water systems and its application to sodium and proton self-diffusion, The Journal of Physical Chemistry C, 122(34) (2018) 19613-19624.
[27] A.C. Van Duin, S. Dasgupta, F. Lorant, W.A. Goddard, ReaxFF: a reactive force field for hydrocarbons, The Journal of Physical Chemistry A, 105(41) (2001) 9396-9409.
[28] W.M. Haynes, CRC handbook of chemistry and physics, CRC press, 2014.
[29] L. Martínez, R. Andrade, E.G. Birgin, J.M. Martínez, PACKMOL: a package for building initial configurations for molecular dynamics simulations, Journal of computational chemistry, 30(13) (2009) 2157-2164.
[30] S. Nosé, A unified formulation of the constant temperature molecular dynamics methods, The Journal of chemical physics, 81(1) (1984) 511-519.
[31] W.G. Hoover, Canonical dynamics: Equilibrium phase-space distributions, Physical review A, 31(3) (1985) 1695.