بررسی تاثیر سرباره، نانو اکسید منیزیم و نانو اکسید مس بر خصوصیات بتن فوق‌توانمند تحت شرایط عمل‌آوری متفاوت با بهره‌گیری از روش پایش مقاومت الکتریکی

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه مهندسی عمران، واحد شاهرود، دانشگاه آزاد اسلامی ، شاهرود، ایران

10.22124/jcr.2023.24236.1617

چکیده

چکیده

بتن در طول مدت سرویس‌دهی ممکن است در تماس با شرایط محیطی سخت قرارگیرد، بتن‌های فوق‌توانمند(UHPC) با توجه به مقاومت و دوام بی‌نظیر می‌توانند به عنوان یک گزینه مناسب مطرح شوند. در این مطالعه برای نخستین بار تاثیر نانو‌ذرات اکسید منیزیم و اکسید مس با مقادیر 0/5، 1 و2 % به صورت مجزا و ترکیب با مقادیر مختلف سرباره کوره آهن‌گدازی( 2/5 ، 5 و10%) بر مقاومت فشاری و مقاومت الکتریکی UHPC حاوی مقدار ثابت الیاف PVA در دو حالت عمل‌آوری استاندارد و تسریع شده (غوطه‌ور در آب با دمای 95 درجه سانتیگراد) برای سنین مختلف مورد مطالعه قرار گرفتند. همچنین برای درک بهتر ریز ساختار بتن، آنالیز پراش‌اشعه ایکسSEM بر روی نمونه‌ها انجام گرفت. نتایج نشان می‌دهد با بهره‌گیری از روش عمل‌آوری حرارتی و اصلاح ریز ساختار در حضور این نانو مواد جدید می‌توان ظرفیت بیشتری از UHPC در مشخصه‌های مقاومت فشاری و مقاومت الکتریکی ایجاد نمود. در طی این پژوهش بعد از 90 روز برای هر یک از نمونه‌های حاوی 1% نانو مواد اکسید منیزیم و اکسید مس به ترتیب رشد مقاومت فشاری به میزان تقریبی 37/4 % و 37.1 % نسبت به نمونه 7 روزه حاصل گردید. در حالی که رشد مقاومت فشاری در حالت تسریع شده برای نمونه‌های مذکور به ترتیب به میزان 16/8 % و 18/8 % نسبت به حالت عمل‌آوری استاندارد، بیشتر بوده است. همچنین با دستیابی به روابط تجربی دقیق بین دو پارامتر مقاومت فشاری و مقاومت الکتریکی یک روش غیر مخرب جهت پیش بینی مقاومت فشاری ارائه شده است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigating the effect of slag, magnesium nano oxide and copper nano oxide on the properties of high strength concrete under different curing conditions with the help of electrical resistivity monitoring method

نویسندگان [English]

  • Seyyed Shayan Hashemi
  • ahmad ganjali
  • Aboozar Mirzakhani
  • Hamidreza Irani
Department of Civil Engineering, Shahrood Brench, Islamic Azad University, Shahrood, Iran
چکیده [English]

Abstract



During the service period, concrete may come into contact with harsh environmental conditions, ultra-high performance concrete can be considered as a suitable option due to its unique strength and durability. In this study, for the first time, the effect of nanoparticles of magnesium oxide and copper oxide with amounts of 0.5, 1 and 2% separately and combined with different amounts of iron slag (2.5, 5 and 10%) on the compressive strength and electrical resistance of UHPC contains a constant content of PVA fibers in two operating modes Standard and accelerated curing (immersion in water at 95°C) were studied for different ages. Moreover, the Scanning Electron Microscopy test (SEM) is conducted on the specimens to understand the concrete's microstructure better. The results show that by using the heat treatment method and microstructure modification in the presence of new nano materials, it is possible to create a higher potential than UHPC in terms of compressive strength and electrical resistivity. So that after 90 days, the compressive strength for each of the specimens containing 1% of magnesium oxide and copper oxide nanomaterials respectively increased the compressive strength by approximately 37.4% and 37.1% compared to the 7-day sample. While the growth of the compressive strength in the accelerated mode for the mentioned specimens was 16.8% and 18.8%, respectively, compared to the standard curing. In addition, by obtaining accurate experimental relationships between the two parameters of compressive strength and electrical resistivity a non-destructive method for predicting compressive strength has been presented.

کلیدواژه‌ها [English]

  • Ultra-High Performance Concrete( UHPC)"
  • Slag"
  • PVA fibers"
  • UHPC and MgO Nano particles"
  • UHPC and Cu2O Nanoparticles"
  • "
  • Compressive strength
  • Electrical resistivity"

مراجع

[1] Mishra, O. & Singh, S.P. (2019) “An overview of microstructural and material properties of ultra-high performance concrete”, Journal of Sustainable Cement-Based Materials, Vol. 8(2), pp. 97-143
[2] Bajaber, M. A., & Hakeem, I. Y. (2021). UHPC evolution, development, and utilization in construction: A review. Journal of Materials Research and Technology, 10, 1058-1074
[3] Mehta, P. K and Monteiro, P. J. M. “Concrete: microstructure, properties, and materials”. McGraw-Hill Education, 2014.
[4] Farmington Hills, M. “ACI 239C. ETR on the Structural Design of Ultra-High Performance Concrete.,” in ACI Committee 239, American Concrete Institute, 2017.
[5] Nematollahi, B. Saifulnaz, M. R. Jaafar, S and Voo, Y. L. “A review on ultra high performance ‘ductile’concrete (UHPdC) technology,” Int. J. Civ. Struct. Eng., vol. 2, no. 3, pp. 1003–1018, 2012.
[6] Ahmad, S. Hakeem, I and Maslehuddin, M. “Development of an optimum mixture of ultra-high performance concrete,” Eur. J. Environ. Civ. Eng., vol. 20, no. 9, pp. 1106–1126, 2016.
[7] Kadri, E. H. Aggoun, S. Kenai, S and Kaci, A. “The compressive strength of high-performance concrete and ultrahigh-performance,” Adv. Mater. Sci. Eng., vol. 2012, 2012.
[8] Z. Li, “Advanced Concrete Technology; Hoboken John Wiley & Sons,” Inc. Hoboken, NJ, USA, 2011.
[9] Mishra O and Singh, S. P. “An overview of microstructural and material properties of ultra-high-performance concrete,” J. Sustain. Cem. Mater., vol. 8, no. 2, pp. 97–143, 2019.
[10] Larrard F. De and Sedran, T.“Optimization of ultra-high performance concrete by the use of a packing model,” Cem. Concr. Res., vol. 24, no. 6, pp. 997–1009, 1994.
[11] Spiesz, R. Yu, P and Brouwers, H. J. H. “Effect of nano-silica on the hydration and microstructure development of Ultra-High Performance Concrete (UHPC) with a low binder amount,” Constr. Build. Mater., vol. 65, pp. 140–150, 2014.
[12] Wu, Z. Shi, C. Khayat, K. H  and Xie, L. “Effect of SCM and nano-particles on static and dynamic mechanical properties of UHPC,” Constr. Build. Mater., vol. 182, pp. 118–125, 2018.
[13] Chunping, G. Qiannan, W. Jintao, L and Wei, S. “The effect of nano TiO2 on the durability of ultra-high-performance concrete with and without a flexural load,” Ceram-Silikáty, vol. 62, pp. 374–381, 2018.
[14] Huang, H. Teng, L. Gao, X. Khayat, K. H. Wang, F and Liu, Z. “Effect of carbon nanotube and graphite nanoplatelet on composition, structure, and nano-mechanical properties of CSH in UHPC,” Cem. Concr. Res., vol. 154, p. 106713, 2022.
[15] ASTM, C. “109/C 109M-02" Standard Test Method for Compressive Strength of Hydraulic Cement Mortars Using 50mm Cube Specimens,” Am. Soc. Test. Mater. west Conshohocken, Pennsylvania, 2002.
[16] TP95, A. “11, Standard Method of Test for Surface Resistivity Indication of Concrete’s Ability to Resist Chloride Ion Penetration,” Am. Assoc. State Highw. Transp. Off. Washington, DC, USA, 2011.
[17] Pyo S and Kim, H.-K. “Fresh and hardened properties of ultra-high performance concrete incorporating coal bottom ash and slag powder,” Constr. Build. Mater., vol. 131, pp. 459–466, 2017.
[18] Xu, A. H. Chen, H. X. Guan, B. W and Feng, C. “Early hydration process of magnesium oxychloride cement with mineral admixture,” Appl Chem Ind, vol. 46, no. 02, pp. 265–269, 2017.
 [19] Janković, K., Bojović, D., & Stojanović, M. (2019). Influence of nanoparticles on the strength of ultra-high performance concrete. In Nanotechnology in Eco-efficient Construction (pp. 13-42). Woodhead Publishing.‏
[20] Heikal M and Ibrahim, N. S. “Hydration, microstructure and phase composition of composite cements containing nano-clay,” Constr. Build. Mater., vol. 112, pp. 19–27, 2016.
[21] Chu, H. Wang, Q. Gao, L. Jiang, J and Wang, F. “An Approach of Producing Ultra-High-Performance Concrete with High Elastic Modulus by Nano-Al2O3: A Preliminary Study,” Materials (Basel)., vol. 15, no. 22, p. 8118, 2022.
[22] ACI, A. C. I. “239R-18: Ultra-High Performance Concrete: An Emerging Technology Report,” Am. Concr. Institute-farmingt. Hills. USA2018, 2018.
[23] Toutlemonde, F. Généreux, G. Resplendino, J and Delort, M. “Product and design standards for UHPFRC in France,” in International Interactive Symposium on Ultra-High Performance Concrete, 2016, vol. 1, no. 1.
[24] EN, B. S. “206-1“Concrete-Specification,” Performance, Prod. Conform. Br. Stand. BSI Gr. Hqrs., vol. 389, 2014.
[25] Li, W. Huang, Z. Cao, F. Sun, Z and Shah, S. P. “Effects of nano-silica and nano-limestone on flowability and mechanical properties of ultra-high-performance concrete matrix,” Constr. Build. Mater., vol. 95, pp. 366–374, 2015.
[26] Park, J.-S. Kim, Y. J. Cho, J.-R and Jeon, S.-J. “Early-age strength of ultra-high performance concrete in various curing conditions,” Materials (Basel)., vol. 8, no. 8, pp. 5537–5553, 2015.
[27] Whiting D. A and Nagi, M. A. “Electrical Resistivity of Concrete–A Literature Review. Portland Cement Association PCA,” Res. Dev. Information, Ser., no. 2457, p. 58, 2003.
[28] ACI 239C, “ETR on the Structural Design of Ultra-High Performance Concrete,” in American Concrete Institute, Farmington Hills, MI. on-line committee documents, 2017.
[29] A. A. of S. H. and Officials, T. “AASHTO TP 95: Standard Method of Test for Surface Resistivity Indication of Concrete’s Ability to Resist Chloride Ion Penetration.” Washington, DC, 2011.
[30]ASTM C1202. (2012). Standard test method for electrical indication of concrete’s ability to resist chloride ion penetration. In American Society for Testing and Materials (Vol. 100, pp. 1-8)
[31] Shekarchizadeh, M. Tahersima, M. Hajibabaee, A and Layssi, H. “Concrete mix proportions with ultra-high electrical resistivity,” in 11DMBC International Conference on Durability of Building Materials and components, 2008.
[32] Nazari, A. Rafieipour, M. H and Riahi, S. “The effects of CuO nanoparticles on properties of self compacting concrete with GGBFS as binder,” Mater. Res., vol. 14, pp. 307–316, 2011.

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