مهندسی سازه و ساخت

مهندسی سازه و ساخت

اثر پوزولان های زئولیت طبیعی و میکروسیلیس بر دوام بتن الیافی در معرض محیط های کلریدی

نوع مقاله : علمی - پژوهشی

نویسندگان
1 دانشجوی کارشناسی ارشد، گروه عمران، موسسه آموزش عالی احرار، رشت، ایران
2 دکتری سازه، گروه عمران، مدرس موسسه آموزش عالی احرار، رشت، ایران
چکیده
مصرف بالای انرژی در صنعت تولید سیمان و انتشار گاز کربن دی‌اکسید تولید شده تهدیدهای جدی زیست محیطی را فراهم آورده است. لذا استفاده از مواد پوزولانی به‌ عنوان جایگزین بخشی از سیمان می‌تواند ضمن ارتقای مشخصه‌های مقاومت و دوام بتن رابطه مستقیمی با توسعه پایدار داشته باشد. در مقاله حاضر اثر پوزولان‌های زئولیت طبیعی در مقادیر 5، 10 و 15 درصد و میکروسیلیس در مقادیر 5 و 10 درصد جایگزین وزنی سیمان بر خواص مقاومتی و دوام بتن حاوی 1 درصد حجمی الیاف فولادی دوسرقلابدار در معرض محیط‌‌های کلریدی مورد بررسی قرار گرفت. بدین منظور آزمایش‌های مقاومت‌های فشاری، کششی و الکتریکی و همچنین آزمایش‌های جذب آب نهایی و نفوذ یون کلر روی نمونه‌های ساخته شده انجام شد. خواص ریزساختاری بتن نیز توسط تصاویر میکروسکوپ الکترونی مورد بررسی قرار گرفت. نمونه‌های مورد نظر در سنین 28 و 90 روز در هر دو شرایط عادی و کلریدی عمل‌آوری شدند. نتایج تحقیق حاضر نشان داد که نمونه‌های حاوی 10 درصد زئولیت طبیعی و 10 درصد میکروسیلیس می‌تواند به عنوان طرح اختلاط بهینه مورد نظر قرار گیرد. اگرچه محیط کلریدی موجب کاهش مقاومت بتن می‌گردد، پوزولان‌های مورد مطالعه در مقاله حاضر می‌تواند این افت مقاومت را به میزان مطلوبی تعدیل نماید. بدین منظور حضور پوزولان‌های زئولیت و میکروسلیس در بتن الیافی در معرض محیط کلریدی موجب شد مقاومت فشاری 90 روز تا 4/13 درصد افت نماید. این میزان در خصوص مقاومت‌های کششی و الکتریکی به ترتیب تا 72/39 و 2/76 درصد نتیجه شده است. همچنین ضریب نفوذ یون کلر در نمونه‌ها نسبت به نمونه شاهد کاهشی حدود 24 درصد داشته است. میانگین افزایش جذب آب در محیط کلریدی نسبت به محیط عادی نیز 6/73 درصد است. از بررسی تصاویر ریزساختاری نیز مشخص گردید که حضور پوزولان‌های زئولیت و میکروسیلیس در بتن می‌تواند بر افزایش تراکم ریزساختار ژل کلسیم سیلیکات هیدراته شده موثر باشد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

The effect of natural zeolite and silica fume on durability of steel fiber reinforced concrete exposed to chloride environment

نویسندگان English

Mojtaba Torabi Golsefidi 1
Mohammad Hajforoush 2
1 M.Sc Student in Structural Eng., Ahrar Institute of Technology and Higher Education, Rasht, Iran
2 Ph,d. in Structural Eng, Department of Civil Enjineering, Ahrar Institute of Technology and Higher Education, Rasht, Iran
چکیده English

The high energy consumption in the cement industry and the emission of CO2 provide serious environmental threats. Therefore, the use of pozzolanic materials as natural cementitious material can have a direct relation to sustainable development. The current research investigates the effect of natural zeolite and silica fume pozzolans on the durability of fiber reinforced concrete in chloride environments. The studied specimens contained silica fume of 5 and 10 percent and zeolite of 5, 10, and 15 percent as cement weight substitutes. Moreover, to examine the impact of steel fibers, one percent volume as the optimal percentage, was added to the mixture. The specimens, after being processed, were tested at 28 and 90 days in normal and chloride conditions. Results showed that various specimens in both conditions increased their compressive strength and mainly tensile strength due to the addition of pozzolans, with and without steel fibers. The electrical resistance of specimens without fibers remarkably exceeded that of the control sample. However, the electrical resistance of specimens containing steel fibers considerably lessened compared to those without fibers. The coefficient of chlorine ion migration was lower in samples containing pozzolan and higher in samples with fibers alone, compared to control samples. The results showed exposure to a chloride environment resulted on average in a decrease in compressive strength by 13.4%, tensile strength by 39.72%, and electrical resistance by 76.2% compared to identical samples in a normal environment. Furthermore, the chloride ion penetration coefficient in the samples, compared to the control samples, had a decrease of 24 to 50 percent. The average increase in water absorption in the chloride environment compared to the normal environment was also 73.6 percent.

کلیدواژه‌ها English

Natural zeolite
Silica fume
Steel fiber
Chlorine ion migration
Chloride environment
[1] ASTM C618. (2023) Edition. Standard specification for coal fly ash and raw or calcined natural pozzolan for use in concrete. ASTM International.
[2] Hamada, M Hussein. Abed, Farid. Herda Yati Binti Katman, Humada, M Ali. Al Jawahery, Mohammed S. Majdi, Ali. Salim T. Yousif, Blessen Skariah Thomas. (2023). Effect of silica fume on the properties of sustainable cement concrete. Journal of Materials Research and Technology, Volume 24, Pages 8887-8908, ISSN 2238-7854,
[3] Basha, Syed Afzal. Vinod, Kumar A. Tej, S. Akhil. Babu, C.G. Mohan. (2023). Evaluation of zeolite as supplementary cementing material. Materials Today: Proceedings, ISSN 2214-7853,
[4] Geetha, S. Lakshmi, S. Muthu. Aarathi, L. Deepak, S. Marshal, T. (2023). Study on properties of recycled aggregate concrete with zeolite. Materials Today: Proceedings, Volume 80, Part 2, Pages 1585-1590, ISSN 2214-7853,
[5] Hosseinzadeh, Haniyeh. Salehi, Amir Masoud. Mehraein, Mojtaba. Asadollahfardi, Gholamreza. (2023). The effects of steel, polypropylene, and high-performance macro polypropylene fibers on mechanical properties and durability of high-strength concrete. onstruction and Building Materials, Volume 386, 131589 ISSN 0950-0618,
[6] Alsaif, Abdulaziz. Alharbi, Yousef R. (2022). Strength, durability and shrinkage behaviours of steel fiber reinforced rubberized concrete, Construction and Building Materials, Volume 345, 128295, ISSN 0950-0618,
[7] Su, Peifeng. Li, Miaomiao. Dai, Qingli. Wang, Jiaqing. (2023). Mechanical and durability performance of concrete with recycled tire steel fibers. Construction and Building Materials, Volume 394,132287, ISSN 0950-0618,
[8] Dabbaghi, Farshad. Sadeghi-Nik, Aref. Nicolas Ali Libre, Nasrollahpour, Sepideh. (2021). Characterizing fiber reinforced concrete incorporating zeolite and metakaolin as natural pozzolans. Structures, Volume 34, Pages 2617-2627, ISSN 2352-0124,
[9] Madhuri, P.V. Kameswara, Rao B. Chaitanya, A. (2021). Improved performance of concrete incorporated with natural zeolite powder as supplementary cementitious material. Materials Today: Proceedings, Volume 47, Part 15, Pages 5369-5378, ISSN 2214-7853,
[10] Iswarya, Gowram. Beulah, M. (2021). Use of zeolite and industrial waste materials in high strength concrete – A review. Materials Today: Proceedings, Volume 46, Part 1, Pages 116-123, ISSN 2214-7853,
[11] Tayeh, Bassam A. Al Saffar, Doha M. Alyousef, Rayed. (2020). The Utilization of Recycled Aggregate in High Performance Concrete. A Review, Journal of Materials Research and Technology, Volume 9, Issue 4, Pages 8469-8481, ISSN 2238-7854,
[12] Pachideh, G. and Gholhaki, M. (2020). An experimental study on the performance of fine-grained concrete incorporating recycled steel spring exposed to acidic conditions. Advances in Structural Engineering. 23 (11), 2458-2470.
[13] Pachideh, G. and Gholhaki, M. (2020). Assessment of post-heat behavior of cement mortar incorporating silica fume and granulated blast-furnace slag. Journal of Structural Fire Engineering Vol. 11 No. 2, 221-246.
[14] Pachideh, G. and Gholhaki, M. Moshtagh, A. (2019). On the post-heat performance of cement mortar containing silica fume or Granulated Blast- Furnace Slag. Journal of Building Engineering 24, 100757.
[15] Pachideh, G. and Gholhaki, M. (2019). An Experimental Study on the Effects of Adding Steel and Polypropylene Fibers to Concrete on Its Resistance after Different Temperatures. Journal of Testing and Evaluation 47 (2), 1606-1620, ISSN 0090-3973.
 [16] Naseroleslami, R. Nemati, M. (2019). The effects of calcium stearate on mechanical and durability aspects of self-consolidating concretes incorporating silica fume/natural zeolite. Construction and Building Materials, Volume 225, Pages 384-400, ISSN 0950-0618,
[17] Tran, Yen Thi. Lee, Jechan. Kumar, Pawan. Kim, Ki-Hyun. Lee, Sang Soo. (2019). Natural zeolite and its application in concrete composite production. Composites Part B: Engineering, Volume 165, Pages 354-364, ISSN 1359-8368,
[18] Samimi, Kianoosh. Kamali, Bernard Siham. Maghsoudi, Ali Akbar. (2018). Durability of self-compacting concrete containing pumice and zeolite against acid attack, carbonation and marine environment, Construction and Building Materials, Volume 165, Pages 247-263, ISSN 0950-0618,
[19] Barari, Sajjad. Abbasi, Shahab. Mahdavi, Adeli Mahdi. Cheini, Mehdi. (2018). Laboratory Study of Factors Affecting the Mechanical Properties and Durability of High Performance Concrete with the Economic Approach. MCEJ; 18 (3) :37-47
[20] Markiv, Taras. Sobol, Khrystyna. Franus, Małgorzata. Franus, W ojciech, (2016). Mechanical and durability properties of concretes incorporating natural zeolite, Archives of Civil and Mechanical Engineering, Volume 16, Issue 4, Pages 554-562, ISSN 1644-9665,
[21] Eskandari, H. Vaghefi, M. Kowsari, K, (2015). Investigation of Mechanical and Durability Properties of Concrete Influenced by Hybrid Nano Silica and Micro Zeolite, Procedia Materials Science, Volume 11, Pages 594-599, ISSN 2211-8128,
[22] Valipour, Mahdi. Pargar, Farhad. Shekarchi, Mohammad. Khani, Sara, (2013). Comparing a natural pozzolan, zeolite, to metakaolin and silica fume in terms of their effect on the durability characteristics of concrete. A laboratory study, Construction and Building Materials, Volume 41, Pages 879-888, ISSN 0950-0618,
[23] Najimi, Meysam. Sobhani, Jafar. Ahmadi, Babak. Shekarchi, Mohammad, (2012). An experimental study on durability properties of concrete containing zeolite as a highly reactive natural pozzolan, Construction and Building Materials, Volume 35. Pages 1023-1033, ISSN 0950-0618,
[24] BS EN 12390-3. (2019). Testing hardened concrete Compressive strength of test specimens.
[25] ASTM C1760. (2012). Standard Test Method for Bulk Electrical Conductivity of Hardened Concrete. ASTM Internaional
[26] ASTM Standard. (2004). Standard test method for splitting tensile strength of cylindrical concrete specimens, ASTM Standard C496, ASTM International, West Conshohocken.
[27] NT BUILD 492. (1999). Concrete, Mortar and Cement-Based RepairMaterials: Chloride Migration Coefficient from non Steady State MigrationExperiments. NORDTEST Method
[28] ASTM C1202. (2022) Edition. Standard Test Method for Electrical indication of concrete’s ability to resist choloride ion penetration. ASTM International.
[29] ASTM C33. (2007). Standard specification for concrete aggregates. ASTM International.

  • تاریخ دریافت 11 آذر 1402
  • تاریخ بازنگری 05 فروردین 1403
  • تاریخ پذیرش 14 اردیبهشت 1403