بررسی خصوصیات مکانیکی، دوامی و عملکردی ملات‌های ترمیمی پایه سیمانی حاوی ضایعات صنایع آهن و آلومینیوم

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی عمران، دانشکده مهندسی، دانشگاه فردوسی مشهد، مشهد، ایران

2 گروه مهندسی عمران ،دانشکده مهندسی، دانشگاه فردوسی مشهد ،مشهد

10.22124/jcr.2022.20837.1523

چکیده

در پژوهش حاضر از ضایعات صنایع آهن و آلومینیوم (غبار کوره آهن‌گدازی، سرباره کوره آهن‌گدازی و گل قرمز) برای جایگزینی بخشی از سیمان در ساخت ملات‌های ترمیمی استفاده شده است. با جایگزینی 5%، 10% و 15% از این ضایعات با سیمان در مجموع 14 طرح اختلاط ساخته شد و مطالعات آزمایشگاهی در سه بخش بر روی آن‌ها انجام شد. در بخش اول سعی در شناخت ریزساختار و ترکیبات شیمیایی مواد تشکیل‌دهنده ملات‌ها شده است. دربخش دوم با انجام آزمایش‌های مقاومت در برابر حمله اسید سولفوریک، جذب آب و مقاومت الکتریکی تلاش برای شناخت خصوصیات دوامی و با انجام آزمایش‌های مقاومت فشاری وکششی سعی در شناخت خصوصیات مکانیکی ملات‌ها شده است. در بخش آخر، یک تیر بتن مسلح به وسیله ملات‌ ترمیمی و شبکه CFRP تقویت برشی شده و با یک تیر فاقد تقویت و یک تیر تقویت شده در برش با ورق‌های CFRP و چسب مقایسه شده است. در نهایت تیرها تحت بارگذاری متمرکز در یک نقطه قرار گرفته و ظرفیت برشی آن‌ها با یکدیگر مقایسه شده تا عملکرد ملات ترمیمی ارزیابی گردد. نتایج آزمایش‌ها نشان می‌دهد که تقویت با استفاده از ملات ترمیمی باعث افزایش ظرفیت برشی به میزان 23% در مقایسه با نمونه کنترل شده است در حالی که نمونه تقویت شده با چسب %14 افزایش ظرفیت برشی نسبت به نمونه کنترل از خود نشان داده است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigation of mechanical properties, durability properties, and functionality of cement-based repair mortars containing steel and alumina industrial wastes

نویسندگان [English]

  • Ahmadreza Ramezani 1
  • Mohammad Reza Esfahani 2
1 Department of civil engineering, Ferdowsi university of Mashhad, Mashhad, Iran
2 Department of Civil Engineering, Faculty of Engineering, Ferdowsi University Of Mashhad (FUM)
چکیده [English]

In the present study, steel and alumina industrial wastes (ground granulated blast-furnace, electric arc furnace dust, and red mud) were used as a partial replacement for cement to form cement-based repair mortars. By substituting 5%, 10%, and 15% of cement with these materials a total of 14 mixtures were formed and an experimental program comprising three distinct parts was carried out. In the first part of the experimental program, the microstructure and chemical composition of all the constituent materials were examined. In the second part, resistance to acid sulfuric, water absorption, and electrical resistivity tests were conducted to evaluate the durability performance of the mortars, and compressive strength and tensile strength tests were performed to assess the mechanical properties of the mortars. In the last part of the experimental program, one reinforced concrete beam was strengthened in shear using repair mortar and carbon fiber reinforced polymer (CFRP) sheets and it was compared with a reinforced concrete beam without strengthening and a beam strengthened in shear using epoxy and CFRP sheets. The beams were tested by implementing a concentrated load and their shear capacity was compared to evaluate the performance of repair mortar. The results indicate that strengthening using repair mortar resulted in 23% increase in the shear capacity compared to the control specimen, while the shear capacity of the specimen strengthened with epoxy increased by 14% compared to the control specimen.

کلیدواژه‌ها [English]

  • Repair mortar
  • steel and alumina industrial wastes
  • shear strengthening
  • Carbon fiber reinforced polymer (CFRP)

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