فاکتورهای تأثیرگذار بر مقاومت فشاری بتن ژئوپلیمری بر پایه خاکستر بادی

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه آزاد اسلامی، واحد علوم تحقیقات، باشگاه پژوهشگران جوان و نخبگان، تهران، ایران

چکیده

در سال‌های اخیر ژئوپلیمر به عنوان یک عامل سیمانی جدید و دوست‌دار محیط زیست، به عنوان جایگزینی برای سیمان پرتلند مطرح شده است. مقاومت فشاری به عنوان یکی از مشخصه‌های مهم بتن، متأثر از پارامتر‌های مختلفی است. در بتن ژئوپلیمری نیز با توجه به مواد تشکیل دهنده، پارامتر‌های مختلفی می‌تواند مقاومت فشاری را تحت تأثیر قرار دهد. در این پژوهش آزمایشگاهی، برخی از پارامتر‌های تأثیرگذار شامل: نوع محلول فعال‌کننده قلیایی، غلظت محلول هیدروکسید سدیم، نسبت وزنی محلول فعال‌کننده قلیایی به منبع آلومیناسیلیکاتی، نسبت وزنی محلول سیلیکات سدیم به هیدروکسید سدیم، دما و زمان عمل‌آوری و میزان آب، مورد مطالعه قرار گرفت. در همین راستا نمونه‌ها ساخته و عمل‌آوری شدند و آزمون مقاومت فشاری از نمونه‌ها گرفته شد. نتایج نشان داد استفاده از محلول فعال‌کننده پتاسیمی منجر به دستیابی به مقاومت فشاری 28 روزه بیشتر و محلول فعال‌کننده سدیمی سبب دست‌یابی به مقاومت زودرس بیشتر می‌شود. افزایش غلظت محلول هیدروکسید سدیم تا 14 مول، سبب افزایش مقاومت فشاری شد؛ اما با افزایش بیشتر غلظت به 16 مول، تغییر قابل ملاحظه‌ای در مقاومت فشاری دیده نشد. افزایش میزان آب در بتن ژئوپلیمری سبب افزایش نسبت آب به مواد خشک و کاهش چشمگیر مقاومت فشاری شد. میزان بهینه نسبت وزنی محلول فعال‌کننده قلیایی به منبع آلومیناسیلیکاتی و نسبت وزنی محلول سیلیکات سدیم به هیدروکسید سدیم به ترتیب 5/0 و 5/1 سنجش شد. افزایش دما و زمان عمل‌آوری تا 90 درجه سانتی‌گراد و 36 ساعت، سبب افزایش نسبی مقاومت فشاری 28 روزه و افزایش قابل ملاحظه مقاومت 3 و 7 روزه بتن ژئوپلیمری شد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Factors Influencing Compressive Strength of Fly Ash-based Geopolymer Concrete

نویسندگان [English]

  • Alireza Esparham
  • Amir Bahador Moradikhou
Young Researchers and Elites club, Science and Research Branch, Islamic Azad University, Tehran, Iran
چکیده [English]

In recent years, geopolymer has been introduced as a novel and green alternative to Portland cement. Compressive strength is considered one of the important characteristics of concrete. In geopolymer concretes, according to the ingredients, several factors have been identified as important parameters affecting the compressive strength. Hence, in this experimental research, several factors affecting the compressive strength of fly ash-based geopolymer concrete including the type of alkaline activator solution, the weight ratio of water to solid material participated in geo-polymerization, sodium hydroxide concentration, the weight ratio of alkaline activator solution to aluminosilicate source, sodium silicate to sodium hydroxide weight ratio and time and temperature of curing, were studied. The obtained results indicated that using potassium hydroxide and potassium silicate as an alkaline activator solution, result in higher 28-day compressive strength compare to sodium-based alkaline activator solution. On the other hand, using sodium hydroxide and sodium silicate as an alkaline activator solution, result in higher 3- and 7-day compressive strengths and also, faster hardening. Furthermore, increasing the weight ratio of water to solid material results in significantly decreasing geopolymer concrete compressive strength. Also, compressive strength is increased with an increase in the concentration of sodium hydroxide up to 14 M, but for 16 M, there are no remarkable changes in compressive strength. The optimum ratio of alkaline activator solution to fly ash and sodium silicate to sodium hydroxide was measured 0.5 and 1.5, respectively. Increasing the time and temperature of curing results in significant increasing 3-and 7-day compressive strengths.

کلیدواژه‌ها [English]

  • Geopolymer Concrete
  • fly ash
  • Compressive Strength
  • alkaline activator solution
  • Factors Influencing Compressive Strength
[1]    V.M. Malhotra, Making concrete ‘greener’ with fly ash, ACI Concrete International, 21 (1999) 61-66.
[2]    L.N. Assi, E. Eddie Deaver, P. Ziehl, Effect of source and particle size distribution on the mechanical and microstructural properties of fly Ash-Based geopolymer concrete, Construction and Building Materials, 167 (2018) 372-380.
[3]    V.M. Malhotra, Reducing CO2 Emissions, ACI Concrete International, 28 (2006) 42-45.
[4]    I. Phummiphan, S. Horpibulsuk, R. Rachan, A. Arulrajah, S.-L. Shen, P. Chindaprasirt, High calcium fly ash geopolymer stabilized lateritic soil and granulated blast furnace slag blends as a pavement base material, Journal of Hazardous Materials, 341 (2018) 257-267.
[5]    R. McCaffrey, Climate Change and the Cement Industry, Global Cement and Lime Magazine (Environmental Special Issue), (2002) 15-19.
[6]    S. Andrejkovičová, A. Sudagar, J. Rocha, C. Patinha, W. Hajjaji, E.F. da Silva, A. Velosa, F. Rocha, The effect of natural zeolite on microstructure, mechanical and heavy metals adsorption properties of metakaolin based geopolymers, Applied Clay Science, 126 (2016) 141-152.
[7]    C. Chen, G. Habert, Y. Bouzidi, A. Jullien, Environmental impact of cement production: detail of the different processes and cement plant variability evaluation, Journal of Cleaner Production, 18 (2010) 478–485.
[8]    C. Meyer, The greening of the concrete industry, Cement & Concrete Composites, 31(8) (2009) 601-605.
[9]    I. Bashir, K. Kapoor, H. Sood, An Experimental Investigation on the Mechanical Properties of Geopolymer Concrete, International Journal of Latest Research in Science and Technology, 6(3) (2017) 33-36.
[10]   E. Ekinci, İ. Türkmen, F. Kantarci, M.B. Karakoç, The improvement of mechanical, physical and durability characteristics of volcanic tuff based geopolymer concrete by using nano silica, micro silica and Styrene-Butadiene Latex additives at different ratios, Construction and Building Materials, 201 (2019) 257-267.
[11]   M.B. Karakoç, İ. Türkmen, M.M. Maras, F. Kantarci, R. Demirbog˘a, M. Ug˘ur Toprak, Mechanical properties and setting time of ferrochrome slag based geopolymer paste and mortar, Construction and Building Materials, 72(Supplement C) (2014) 283–292.
[12]   S. Yaseri, G. Hajiaghaei, F. Mohammadi, M. Mahdikhani, R. Farokhzad, The role of synthesis parameters on the workability, setting and strength properties of binary binder based geopolymer paste, Construction and Building Materials, 157(Supplement C) (2017) 534–545.
[13]   A. Karthik, K. Sudalaimani, C.T. Vijaya Kumar, Investigation on mechanical properties of fly ash-ground granulated blast furnace slag based self-curing bio-geopolymer concrete, Construction and Building Materials, 157(Supplement C) (2017) 338–349.
[14]   Bagheri, A. Nazari, Compressive strength of high strength class C flyash-based geopolymers with reactive granulated blast furnace slagaggregates designed by Taguchi method, Materials & Design, 54 (2014) 483–490.
[15]   T.W. Cheng, J.P. Chiu, Fire-resistant geopolymer produced by granulated blast furnace slag, Minerals Engineering, 16(3) (2003) 205-210.
[16]   K. Sakkas, D. Panias, P.P. Nomikos, A.I. Sofianos, Potassium based geopolymer for passive fire protection of concrete tunnels linings, Tunnelling and Underground Space Technology, 43 (2014) 148-156.
[17]   P.K. Sarker, S. Kelly, Z. Yao, Effect of fire exposure on cracking, spalling and residual strength of fly ash geopolymer concrete, Materials & Design, 63 (2014) 584-592.
[18]   W.K.W. Lee, J.S.J. van Deventer, The effects of inorganic salt contamination on the strength and durability of geopolymers, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 211(2) (2002) 115-126.
[19]   A. Palomo, M.T. Blanco-Varela, M.L. Granizo, F. Puertas, T. Vazquez, M.W. Grutzeck, Chemical stability of cementitious materials based on metakaolin, Cement and Concrete Research, 29(7) (1999) 997-1004.
[20]   M. Zhang, H. Guo, T. El-Korchi, G. Zhang, M. Tao, Experimental feasibility study of geopolymer as the next-generation soil stabilizer, Construction and Building Materials, 47 (2013) 1468-1478.
[21]   S.E. Wallah, Creep Behaviour of Fly Ash-Based Geopolymer Concrete, Civil Engineering Dimension, 12(2) (2010) 73-78.
[22]   P. DeSilva, K. Sagoe-Crenstil, V. Sirivivatnanon, Kinetics of geopolymerization: role of Al2O3 and SiO2, Cement and Concrete Research, 37(4) (2007) 512-518.
[23]   K. Gao, K.-L. Lin, D. Wang, C.-L. Hwang, B.L. Anh Tuan, H.-S. Shiu, T.-W. Cheng, Effect of nano-SiO2 on the alkali-activated characteristics of metakaolin-based geopolymers, Construction and Building Materials, 48 (2013) 441-447.
[24]   G. Görhan, G. Kürklü, The influence of the NaOH solution on the properties of the fly ash-based geopolymer mortar cured at different temperatures, Composites Part B: Engineering, 58 (2014) 371-377.
[25]   D. Hardjito, S.E. Wallah, D.M.J. Sumajouw, B.V. Rangan, On the Development of Fly Ash-Based Geopolymer Concrete, ACI Materials Journal, 101(6) (2004) 467-472.
[26]   J. Davidovits, Geopolymer Chemistry and Properties, in:  Geopolymer '88, France, 1988, pp. 25-48.
[27]   J. Davidovits, Soft Mineralurgy and Geopolymers, in:  Geopolymer ’88, France, 1988, pp. 19-23.
[28]   H. Xu, J.S.J. van Deventer, The Geopolymerisation of Alumino-Silicate Minerals, International Journal of Mineral Processing 59(3) (2000) 247-266.
[29]   A.M. Rashad, A comprehensive overview about the influence of different additives on the properties of alkali-activated slag – A guide for Civil Engineer, Construction and Building Materials, 47 (2013) 29-55.
[30]   A. Sharma, J. Ahmad, Experimental study of factors influencing compressive strength of geopolemer concrete, International Research Journal of Engineering and Technology, 4(5) (2017) 1306-1313.
[31]   Y.J. Patel, N. Shah, Study on Workability and Hardened Properties of Self Compacted Geopolymer Concrete Cured at Ambient Temperature, Indian Journal of Science and Technology, 11(1) (2018) 1-12.
[32]   D. Hardjito, B.V. Rangan, Development and properties of low-calcium fly ash-based geopolymer concrete, Research Report, Faculty of Engineering Curtin University of Technology, Perth, Australia, 2005.
[33]   H.T.B.M. Petrus, J. Hulu, G.S.P. Dalton, E. Malinda, R.A. Prakosa, Effect of Bentonite Addition on Geopolymer Concrete from Geothermal Silica, Materials Science Forum, 841 (2016) 7-15.
[34]   J.G.S. van Jaarsveld, J.S.J. van Deventer, G.C. Lukey, The effect of composition and temperature on the properties of fly ash- and kaolinite-based geopolymers, Chemical Engineering Journal, 89(1-3) (2002) 63-73.
[35]   Satpute Manesh, R. Wakchaure Madhukar, V. Patankar Subhash, Effect of duration and temperature of curing on compressive strength of geopolymer concrete, International Journal of Engineering and Innovative Technology, 1 (2012) 372-391.
[36]   M.N.S. Ahmed, M. Nuruddin, S. Demie, N. Shafiq, Effect of curing conditions on strength of fly ash based self-compacting geopolymer concrete, International Journal of Civil, Environmental, Structural, Construction and Architectural Engineering, 5(8) (2011) 8-22.
[37]   ASTM C127-15, Standard Test Method for Relative Density (Specific Gravity) and Absorption of Coarse Aggregate, ASTM International, West Conshohocken, PA, 2015.
[38]   ASTM C128-15, Standard Test Method for Relative Density (Specific Gravity) and Absorption of Fine Aggregate, ASTM International, West Conshohocken, PA, 2015.
[39]   ASTM C136 / C136M-14, Standard Test Method for Sieve Analysis of Fine and Coarse Aggregates, ASTM International, West Conshohocken, PA, 2014.
[40]   ASTM D2419-14, Standard Test Method for Sand Equivalent Value of Soils and Fine Aggregate, ASTM International, West Conshohocken, PA, 2014.
[41]   British Standards Institution, Testing Concrete: Method for Determination of the Compressive Strength of Concrete Cubes, BS1881: Part116: 1983, London.
[42]   P. Duxson, J.L. Provis, G.C. Lukey, J.S.J. van Deventer, The role of inorganic polymer technology in the development of ‘green concrete’, Cement and Concrete Research, 37(12) (2007) 1590-1597.
[43]   J. Davidovits, Chemistry of Geopolymeric Systems, Terminology In: Proceedings of 99 International Conference, eds. Joseph Davidovits, R. Davidovits & C. James, France,  (1999).
[44]   K. Komnitsas, D. Zaharaki, V. Perdikatsis, Effect of synthesis parameters on the compressive strength of low-calcium ferronickel slag inorganic polymers, Journal of Hazardous Materials, 161(2) (2009) 760-768.
[45]   Panagiotopoulou, G. Kakali, S. Tsivilis, T. Perraki, M. Perraki, Synthesis and Characterization of Slag Based Geopolymers, Materials Science Forum, 636-637 (2010) 155-160.
[46]   F.A. Memon, M.F. Nuruddin, N. Shafiq, Effect of silica fume on the fresh and hardened properties of fly ash-based self-compacting geopolymer concrete, International Journal of Minerals, Metallurgy, and Materials, 20(2) (2013) 205-213.
[47]   S.H. Sanni, R. Khadiranaikar, Performance of alkaline solutions on grades of geopolymer concrete, International Journal of Research in Engineering and Technology, 2(11) (2013) 366-371.
[48]   ] M.T. Junaid, O. Kayali, A. Khennane, J. Black, A mix design procedure for low calcium alkali activated fly ash-based concretes, Construction and Building Materials, 79 (2015) 301-310.
[49]   E.I. Diaz-Loya, E.N. Allouche, S. Vaidya, Mechanical properties of fly-ash-based geopolymer concrete, ACI Materials Journal, 108(3) (2011) 300.
[50]   N. Lloyd, V. Rangan, Geopolymer concrete with fly ash, in:  Proceedings of the Second International Conference on Sustainable Construction Materials and Technologies, UWM Center for By-Products Utilization, 2010, pp. 1493-1504.
[51]   N. Muhammad, S. Baharom, N.A.M. Ghazali, N.A. Alias, Effect of Heat Curing Temperatures on Fly Ash-Based Geopolymer Concrete, International Journal of Engineering & Technology, 8(1.2) (2019) 15-19.