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ارزیابی تأثیر پارامترهای متفاوت بر روی مقاومت بتن در برابر نفوذ یون کلراید و تخلخل آن | ||
| نشریه مهندسی عمران امیرکبیر | ||
| مقاله 17، دوره 53، شماره 3، خرداد 1400، صفحه 1067-1082 اصل مقاله (1.7 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/ceej.2019.16760.6336 | ||
| نویسندگان | ||
| یوسف زندی* 1؛ مجید عابدی2 | ||
| 1هیئت علمی دانشگاه ازاد واحد تبریز | ||
| 2گروه عمران سازه ، دانشکده فنی و مهندسی، دانشگاه آزاد واحد تبریز | ||
| چکیده | ||
| یکی از عوامل اصلی دوام بتن نفوذپذیری آن است. نفوذپذیری بتن تابع دو عامل سیال عبوری و محیط متخلخل نفوذ است. در این تحقیق برای ارزیابی تأثیر پارامترهای نسبت آب به سیمان (w/c)، نوع و درصد خاکستر بادی بر روی نفوذپذیری بتن، آزمایشهای نفوذ سریع یون کلراید (RCPT) و تخلخلسنجی به روش جیوه (MIP) انجام شد؛ که آزمایشها بر روی آزمونههای با نسبت آب به سیمان (w/c) متفاوت و بدون خاکستر بادی و همچنین از آزمونههای با نسبت آب به سیمان (w/c) ثابت و خاکستر بادی متفاوت، با گریدهای استاندارد F,C و خاکستر بادی صنعتی ویژه با نام تجاری A، که تشکیلدهنده 18 طرح اختلاط بتن میباشند، انجام گردید. (تعداد کل نمونهها 216 عدد) انجام گردید. نتایج نشان میدهد که کاهش نسبت آب به سیمان (w/c)، باعث کاهش قطر تخلخل و حجم نفوذ میشود، اما این امر باعث کاهش سریع کارایی و مشکلات جدید اجرایی میگردد و نیز در مقایسه با افزایش درصد خاکستر بادی، تأثیر کمتری بر افزایش مقاومت بتن در مقابل یون کلراید داشته است. همچنین با افزایش درصد هر سه نوع خاکستر بادی باعث کاهش نفوذ سریع یون کلراید، قطر تخلخل و حجم نفوذ میگردد و نیز کارایی بتن را افزایش میدهد. از نتایج این تحقیق میتوان دریافت که پارامترهای نسبت آب به سیمان (w/c)، نوع و درصد خاکستر بادی در بتن بر روی نفوذپذیری بتن تأثیر زیادی داشته و باعث افزایش یا کاهش دوام و کارایی بتن گردیده است. نکته جالب در قابلیت انتشار یون کلر در بتنهای حاوی خاکستر بادی این است که در مواردی که حتی نمونه حاوی خاکستر بادی صنعتی ویژه با نام تجاری A، دارای تخلخل بیشتری نسبت به نمونه شاهد (فاقد خاکستر) بوده باز هم کاهش انتشارپذیری یون کلر به دلیل واکنشهای ویژه درونی یون کلر با فازهای آلومین مشاهده گردید. | ||
| کلیدواژهها | ||
| نفوذ یون کلراید؛ تخلخل بتن؛ نسبت آب به سیمان (w/c)؛ خاکستر بادی؛ نفوذپذیری بتن؛ دوام | ||
| موضوعات | ||
| تکنولوژی بتن؛ مصالح مختلف ساختمانی؛ مصالح نوین جهت اصلاح خواص بتن؛ مواد و مصالح | ||
| عنوان مقاله [English] | ||
| Comparative Evaluation of the Effect of Water/Cement Ratio (w/c), Type and Percentage of Fly Ash on Concrete Strength against Chloride Ion Penetration and Its Porosity | ||
| نویسندگان [English] | ||
| Majid Abedi2؛ | ||
| 2Department of Civil Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran | ||
| چکیده [English] | ||
| In this research, the effect of water-to-cement ratio (w/c), type and percentage of fly ash on concrete permeability, rapid penetration of ion chloride (RCPT), and porosity measurements using mercury (MIP) was performed, which consists of 18 concrete mixing designs (total number of 216 samples). The results show that reduction of water to cement ratio (w/c) decreases porosity and penetration volume, but this results in a rapid reduction of efficiency and new operating problems, and also in comparison with increasing the percentage of ash of wind, Has had a lower impact on the strength of concrete against chloride ion. Also, increasing the percentage of all three types of air ash, reduces the penetration of the ion chloride, porosity, and penetration volume, and also increases the efficiency of the concrete. From the results of this study, it can be seen that the water/cement ratio (w/c), the type and percentage of ash in the concrete have a significant effect on the concrete permeability and have increased or decreased the durability and efficiency of the concrete. An interesting point in the ability to release chlorine ions in wind-blown concrete is that even if the specimen containing the industrial A-type industrial ash contains more porosity than the control sample (ash-free), the reduction of chlorine ion release is due to Internal reactions of chlorine ion with alumina phases were observed. | ||
| کلیدواژهها [English] | ||
| Penetration of chloride ion, Concrete porosity, Water to cement ratio (w/c), Fly ash, Concrete permeability | ||
| مراجع | ||
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[1] Bertolini L, Elsener B, Pedeferri P, Polder R (2004)." Corrosion of steel in concrete". Wiley-VCH Verlag GmbH & Co. [2] Ramezanianpour, A.A., Pilvar, A.R., Mahdikhani, M., Moodi, F., 2011, Practical Evaluation of Relationship between Concrete Resistivity, Water Penetration, Rapid Chloride Penetration and Compressive Strength, Construction and Building Materials, vol. 25, pp. 2472–2479, (2011). [3] Mehta, P.K., Monteiro, P.J.M., 2008, Concreto: microestrutura, propriedades e materiais. 3rd ed. São Paulo: IBRACON; 2008. 674p. [4] Yoon-Seok, Ch., Jung Gu, k., Kwang-Myon., L., 2006, Corrosion behavior of steel bar embedded in fly ash concrete, Corrosion Science, No. 48, pp. , (2006) 1733-1745. [5] Zandi.Y, Concrete tests and interpretation of laboratory result concrete mixing design, Tabriz: Forouzou Publication, first Edition, 2007 (in Persian) [6] Zandi.,Y, Advanced concrete technology, Tabriz: Forouzou Publication, Second Edition,2009 (in Persian) [7] Ha-Won Song, Seung-Woo Pack, Sang-Hyeok Nam, Jong-Chul Jang and Velu Saraswathy, “Estimation of the permeability of silica fume cement concrete”, Construction and building material, 2010. [8] Guneyisi, E., Gesoslu, M., 2012, Strength, permeability and shrinkage cracking of silica fume and metakaolin concretes, Construction and Building Materials. Volume 34, September 2012. [9] Vahidi,A, MirAhmadi,M, Hassanzadeh,M, Zabetiyan,F, Investigation of Effective Factors on Concrete impermeability Studies ,Case Study of the First Iranian Concrete boat, International Conference on Impermeability Concrete of Drinking Water Tanks,2011(in Persian) [10] Powers, T.C., 1958, Structure and physical properties of hardened Portland cement paste, Ceramic Soc., Volume 41, Jan. 1958 (RCPT). [11] Tadvin,M, Maleki,M.S,Zehni,S,Maleki,M.J, Evaluation of the effect of fly ash on electrical conductivity, electrical resistance and chloride ion penetration index of concrete (RCPT), Road, Housing and Housing Research Center, Ninth National Concrete Conference of Iran,2013. (In Persian) [12] Brito, J., Saikia, N., 2013, Recycle aggregate in concrete, Springer London, 2013. [13] Ahmad, S., 2003, Reinforcement corrosion in concrete structures, its monitoring and service life prediction a review, Cement & Concrete Composites, No. 25, pp. 459–471. [14] Kolias, S., Georgiou, C., 2005, The effect of paste volume and of water content on the strength and water absorption of concrete, Cement & Concrete Composites, No. 27, PP. 211-216. [15] Zandi, Y., 2006, Effect of Mixture Composition on Washout Resistance of Highly Flow able Underwater Concrete, 2nd International FIB Congress- Naples- Italia 5-8 June 2006. [16] Ericikdi, B., Cihangir, F., Kesimal, A., Deveci,H., Alp, I., 2009, Utilization of industrial waste products as pozzolanic material in cemented paste backfill of high sulphide mill tailings, J. Hazard. Mater. 168 (2009) 848–856. [17] Fais, B., Sabio, N., Strachan, N., 2016, The critical role of the industrial sector in reaching long-term emission reduction, energy efficiency and renewable targets, Appl. Energy 162 (2016) 699–712. [18] Rajamma, R., Ball, R.J., Tarelho, L.A.C., Allen, G.C., Labrincha, J.A., Ferreira, V.M., 2009, Characterization and use of biomass fly ash in cement-based materials, J. Hazard. Mater. 172 (2009) 1049–1060 [19] Embong, R., Kusbiantoro, A., Shafig, N., Nuruddin, M.F., 2016, Strength and microstructural properties of fly ash based geopolymer concrete containing high-calcium and water absorptive aggregate, J. Clean. Prod. 112 (2016) 816–822. [20] Siddique, R., Jameel, A., Singh, M., Barnat-Hunek Kunal, D., Ait-Mokhtar, A., Belarbi, R., Rajor, A., 2017, Effect of bacteria on strength, permeation characteristics and micro-structure of silica fume concrete, Constr. Build. Mater. 142 (2017) 92–100. [21] Khan, M.I., Siddique, R., 2011, Utilization of silica fume in concrete: Review of durability properties. Resources, Conservation and Recycling, 57, 30-35. [22] De Sensale, G.R., 2006, Strength development of concrete with rice-husk ash. Cement and concrete composites, 28(2), 158-160. [23] Leng, F., N. Feng and X. Lu, 2000. An experimental study on the properties of resistance to diffusion of chloride ions of fly ash and blast furnace slag concrete, Cement and Concrete Research Volume 30, Issue 6, June 2000, Pages 989-992. [24] Research on the capability of permeability and frost-resistant of concrete in NaCl solution. Concrete, 200: 15-17. [25] Cur Report, 1991, Fly Ash as Addition to Concrete, Centre for Civil Engineering Research and Codes, Report 144, 1991. [26] Roy, D.M., 1987, Hydration of Blended Cements Containing Slag, Fly Ash, or Silica Fume, Proc. of Meeting Institute of Concrete Technology, Coventry, UK, May 1987. [27] Moffatt, E.G., Thomas, M.D.A., Fahim, A., 2017, Performance of high-volume fly ash concrete in marine environment, Cement and Concrete Research 102 (2017) 127–135. [28] Zafar, I., Sugiyama, T., 2018, The influence of bending crack on rebar corrosion in fly ash concrete subjected to different exposure conditions under static loading, Construction and Building Materials 160 (2018) 293–307. [29] Quanbing, Y., Peirong, Z., 2004. Effect of steel fiber on the deicer-scaling resistance of concrete. J. Build. Mater. 7(4): 376-378. [30] Power, T.C., 1954. Void spacing as a basis for producing air-entrained concrete. ACI J. Proc., 50(9): 741-760. [31] Zhang, M., 2007. Permeability of high performance concrete pavement resistance to chloride ion. Low Temp. Archit. Technol., 1: 14-16. [32] Zhang, Y., Hongfa, Y., Jiachun, W., 2009. Injury law a concrete structure of the surface salt freezing conditions. Chinese J. Highway, 22(4). [33] Ma, H., Mercury intrusion porosimetry in concrete technology: tips in measurement, pore structure parameter acquisition and application. Journal of porous materials, 2014. 21(2): p. 207-215. [34] AASHTO T277-15, 2015, Standard Method of Test for Rapid Determination of the Chloride Permeability of Concrete”, www.transportation.org [35] ASTM C1202-17a, 2017, Standard Test Method for Electrical Indication of Concrete's Ability to Resist Chloride Ion Penetration, ASTM International, West Conshohocken, PA, 2017, www.astm.org [36] Aligizaki, K.K., 2005, Pore structure of cement-based materials: testing, interpretation and requirements. 2005: CRC Press.
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