بررسی آزمایشگاهی و تحلیل آماری مقاومت‌های طراحی سازه‌ای و ضربه‌ای ملات های ژئوپلیمری الیافی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی عمران، دانشگاه سمنان، سمنان، ایران

2 دانشگاه سمنان

3 استاد یار گروه عمران دانشکده فنی دانشگاه لرستان

چکیده

با توجه به میزان مصرف بالای ملات و بتن به ویژه در سازه‌ها و نیاز روز افزون به تولید سیمان، توجه به اثرات مخرب زیست محیطی این ماده ضروری به نظر می‌رسد. یکی از راه کارها، تولید مصالح سازگار با محیط زیست و با کاهش اثرات مخرب مرتبط با تولید سیمان پرتلند، همچون ملات و بتن‌های ژئوپلیمری سرباره‌ای می‌باشد. هدف این مقاله بررسی آزمایشگاهی با رویکرد آماری خصوصیات مکانیکی و مقاومتی ملات‌های سیمانی و ژئوپلیمری الیافی است چهار طرح اختلاط شامل سه طرح اختلاط ژئوپلیمری به ترتیب با 0، 5/0 و 1 درصد میکروالیاف فولادی و یک طرح اختلاط ملات معمولی به منظور مقایسه با ملات ژئوپلیمری در نظر گرفته شد. مجموعا 320 نمونه ساخته شد که از هر طرح اختلاط 20 نمونه مکعبی ، 20 نمونه استوانه‌ای، 20 نمونه تیر کوچک، 20 نمونه دیسک کوچک ساخته شد. نتایج آزمایش‌ها نشان داد با افزایش درصد میکروالیاف فولادی تا 1 درصد در نمونه‌های ژئوپلیمری، مقاومت فشاری، کششی و مدول گسیختگی ترتیب تا 6/39، 60/86 و 63/40 % افزایش یافت همچنین تعداد ضربات مقاومت انهدام حدود 25 برابر بیشتر شد. در تمامی آزمایش‌های مقاومت فشاری، کششی، خمشی و ضربه ای نمونه‌های ژئوپلیمری بدون الیاف، مقاومت بهتری نسبت به نمونه‌های ملات معمولی سیمانی داشتند. در تمامی نمونه‌های ژئوپلیمری با افزایش درصد الیاف، انحراف از معیار و ضریب تغییرات و در نتیجه پراکندگی داده‌ها افزایش یافت.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Experimental investigation and statistical analysis on structural design and impact strengths of fiber geopolymer mortar

نویسندگان [English]

  • mohammad hossein dalvand 1
  • Mohammad Kazem Sharbatdar 2
  • Ahmad Dalvand 3
1 Faculty of Civil Engineering, Semnan University, Semnan, Iran
2 Semnan University
3 Lorestan University
چکیده [English]

Due to the high consumption of mortar and concrete, especially in structures and the increasing demand for cement production, considering the environmental degradation effects of this substance, it seems necessary. One of the solutions is to produce environmentally friendly materials and reduce the damaging effects of Portland cement production, Such as slag geopolymer mortar and concrete. The purpose of this paper is to experimentally investigate the statistical approach of the mechanical and resistive properties of cement mortar and geopolymer fibers mortar. Four mix designs, including three geopolymer mix designs with 0, 0.5, and 1% steel micro-fibers and a conventional mortar mix design, were considered. A total of 320 specimens were made, each consisting of 20 cubic specimens, 20 cylindrical specimens, 20 small beam specimens, and 20 small disc specimens. The results indicated that by increasing the percentage of steel microfibers up to 1% in geopolymer samples, the compressive strength, tensile strength and modulus of rupture increased by 6.39, 60.86, and 63.40%, respectively. The number of destruction resistance blows was also about 25 times higher. In all compressive, tensile, flexural, and impact strengths tests, the non-fiber geopolymer specimens had better behavior than conventional cement mortar specimens. In all geopolymer specimens with increasing fiber percentage, standard deviation and coefficient of variation increased as a result of data dispersion.

کلیدواژه‌ها [English]

  • Mechanical characteristics
  • Statistical analysis
  • Geopolymer mortar
  • Micro steel fiber
  • Impact strength

مراجع

[1] M. Taylor, C. Tam, D. Gielen, Energy efficiency and CO2 emissions from the global cement industry, Korea, 50(2.2) (2006) 61-7.
[2]  A.M. Rashad, S.R. Zeedan, The effect of activator concentration on the residual strength of alkali-activated fly ash pastes subjected to thermal load, Construction and Building Materials, 25(7) (2011) 3098-3107.
[3] E. Gartner, Industrially interesting approaches to low CO2 cements, Cement and Concrete research, 34(9) (2004) 1489-1498.
[4] M. Weil, K. Dombrowski, A. Buchawald, Life-cycle analysis of Geopolymers, Geopolymers, Structure, Processing, Properties and Applications, Cambridge: Woodhead Publishing Limited Abington Hall, (2009) 194-210.
[5] Z. Li, Z. Ding, Y. Zhang, Development of sustainable cementitious Materials, In Proceedings of international workshop on sustainable development and concrete technology, Beijing, China, (2004) 55-76
[6] 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, Vol. 157, (2017) 534-545.
[7] Z.H. Zhang, X. Yao, H.J. Zhu, S.D. Hua, Y. Chen, Preparation and mechanical properties of polypropylene fiber reinforced calcined kaolin-fly ash based geopolymer, Journal of Central South University of Technology, (2009) 49-52.
[8] S. Aydın, B. Baradan, The effect of fiber properties on high performance alkali-activated slag/silica fume mortars, Composites Part B: Engineering, 45(1) (2013) 63-69.
[9] X. Chena, G.R. Zhua, J. Wanga, Q. Chenb, Effect of polyacrylic resin on mechanical properties of granulated blast furnace slag based geopolymer, Journal of Non-Crystalline Solids, 2016.
[10] T. Alomayri, Effect of glass microfiber addition on the mechanical performances of fly ash-based geopolymer composites, Journal of Asian Ceramic Societies 5, (2017) 334–340.
[11] K. Neupane, D. Chalmers, P. Kidd, High-Strength Geopolymer Concrete Properties (Advantages and Challenges), Advances in Materials. Vol. 7, pp, (2018), Pages 15-25.
[12] J.G.S.Jaarsveld, , J.S.J.Deventer, L.Lorenzen, The potential use of geopolymeric materials to immobilise toxic metals: Part I. Theory and applications, Miner Eng, 10, PP, (1997), 659–669.
[13] N.Lloyd  and V. Rangan,,  Geopolymer Concrete; Sustainable Cement   less Concrete, Proceedings  of  the  10th ACI  International  Conference  on  Recent  Advances  in  Concrete Technology and Sustainability Issues, Seville, (2009).
[14] E. Gartner, Industrially Interesting Approaches to “Low-CO2” Cements, Cement and Concrete Research, 34, (2004), 1489-1498.
[15] D.Khale, R.Chaudhary, Mechanism of Geopolymerization and Factors Influencing Its Development: A Review, Journal of Materials Science, 42 (2007) 729-746.
[16] T. Tho-in, V. Sata, P. Chindaprasirt, C. Jaturapitakkul, Previous high-calcium fly ash geopolymer concrete, Constr. Build. Mater, 30 (325) (2012) 366–371.
[17] J. Davidovits, Inorganic Polymeric New materials, Journal of Thermal Analysis Vol. 37, (1991) 1633-1656.
[18] C.K. Yip, G.C. Lukey, J.S.J. Van Deventer, The coexistence of geopolymeric gel and calcium silicate hydrate at the early stage of alkaline activation, Cement & Concrete Research, Vol. 35, pp, (2005)1688-1697.
[19] M. Mastali, A. Dalvand, M. Fakharifar, Statistical variations in the Impact resistance and mechanical properties of polypropylene fiber reinforced self-compacting concrete, Journal of Computers and Concrete. 18(1) (2016).
[20] M. Mastali, A. Dalvand, A.R. satarifar, The impact resistance and mechanical properties of reinforced self-compacting concrete with recycled glass fiber reinforced polymers, Journal of Cleaner Production, Volume 124, 15 (2016), Pages 312–324.
[21] M.Mastali, A. Dalvand, The impact resistance and mechanical properties of self-compacting concrete reinforced with recycled CFRP pieces, Journal of Composites Part B: Engineering, Volume 92 (2016) Pages 360–376.
[22] M. Albitar, M.S. Mohamed Ali, P. Visintin, M. Drechsler, Durability evaluation of geopolymer and conventional concretes, Construction and Building Materials 136 (2017) 374–385.
[23] I.Azizul, U. Johnson, M.Jumaat, N.Ghazali, Y.Sumiani, I.Ibnul Bashar, Influence of steel fibers on the mechanical properties and impact resistance of lightweight geopolymer concrete, Construction and Building Materials 152 (2017) 964–977.
[24] P. Visintin, M.S. Mohamed Ali, M. Albitar, W. Lucas, Shear behaviour of geopolymer concrete beams without stirrups, Construction and Building Materials 148 (2017) 10–21.
[25] S.Hamdy K, E.Ahmed S, W.Ahmed M, Mechanical properties of fly ash based geopolymer concrete with full and partial cement replacement, Construction and Building Materials 126 (2016) 560–565.
[26] D.Bondar, C. J.Lynsdale, N. B.Milestone, N.Hassani, A. A. Ramezanianpour, Effect of heat treatment on reactivity-strength of alkali-activated natural pozzolans, Construction and Building Materials, 25(10), pp, (2011) 4065-4071.
 [27] D.Bondar, C. J.Lynsdale, N. B.Milestone, N.Hassani, A. A. Ramezanianpour, Effect of type, form, and dosage of activators on strength of alkali-activated natural pozzolans, Cement and Concrete Composites, 33(2), pp, (2011) 251-260.
[28] D. Hardjito, B.V. Rangan, On the Development of Fly Ash-Based Geopolymer Concrete, ACI MATERIALS JOURNAL, (2004)101-M52.
[29] M.S. Villarreal, A. Manzano-Ramírez, S. Sampieri-Bulbarela, J. Ramón, J.L.Reyes-Araiza, J.C. Rubio, J.J. Pérez-Bueno, L.M. Apatiga, A. Zaldivar, V. Amigó-Borrás, The effect of temperature on the geopolymerization process of a metakaolin-based geopolymer, Materials Letters, 65, PP, (2011) 995–998.
[30] ASTM C109/C109-12, Standard test method for compressive strength of hydraulic cement mortars (using 2-in. or [50-mm] cube specimens), ASTM International, West Conshohocken, PA, USA, (2013).
[31] R.N. Swamy, H.Stavrides, Some Statistical Considerations of Steel Fibre Reinforced Composites, Cement and Concrete Research, 6(2) (1976) 201-216.
[32] K.W. Day, Concrete Mix Design, Quality Control and Specification, 2nd Edition, London: E&FN Spon, 1999.
[33] ASTM C496/C496M-11, Standard Test Method for Splitting Tensile Strength of Cylindrical Concrete Specimens, ASTM International, West Conshohocken, PA, USA, (2004).
[34] ASTM C78/C78M-16, Standard Test Method for Flexural Strength of Concrete (Using Simple Beam with Third-Point Loading), ASTM International, West Conshohocken, PA, (2016).
[35] ACI Committee 544, Measurement of properties of fiber reinforced concrete, ACI Mater. J, 85 (6) (1988) 583– 593.
[36] A. Badr, A.F. Ashour, A.K. Platten, Statistical variations in impact resistance of polypropylene fibre-reinforced concrete, International Journal of impact engineering, Vol.32, pp, (2006) 1907-1920.
نشریه مهندسی عمران امیرکبیر
دوره 53، شماره 10
دی 1400
صفحه 4305-4324

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