بررسی مشخصات مکانیکی و جمع شدگی خشک ملات تعمیری ژئوپلیمری الیافی حاوی ضایعات کارخانه‌های آهن و آلومینیوم

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه عمران، دانشکده فنی، دانشگاه گیلان، رشت، ایران

10.22124/jcr.2023.25748.1631

چکیده

در این مقاله از روباره آسیاب شده کوره آهن گدازی و گل سرخ که محصول ضایعاتی کارخانه‌های آهن و آلومینیوم می‌باشند، به عنوان مواد پایه آلومینوسیلیکاتی در طرح مخلوط ملات تعمیری ژئوپلیمری استفاده شد. فعال‌سازی مواد پایه با ترکیبی از محلول هیدروکسید سدیم (سود) و سیلیکات سدیم (آب شیشه) انجام گرفت. تاثیر الیاف فولادی بر مقاومت فشاری، چقرمگی و جمع شدگی خشک ملات بررسی شد. از ملات‌های الیافی ساخته شده به عنوان یک لایه تعمیری در تقویت تیرهای آجری استفاده گردید. نتایج نشان داد که استفاده از الیاف فولادی در ملات ژئوپلیمری می‌تواند به نحو موثری مقاومت فشاری و چقرمگی را بهبود بخشد و جمع شدگی خشک را کاهش دهد و رفتار گسیختگی ترد تیرهای آجری را به یک رفتار شکل پذیر تغییر دهد. نتایج آزمایش SEM-EDS و اندازه گیری نسبت مولی Si/Al بیان‌گر وجود یک ساختار سه بعدی و زنجیره‌ای شکل ژئوپلیمری در میکروساختار ملات بود. تحقیق انجام شده یک قدم موثر و رو به جلو در دستیابی به فرآورده‌های ژئوپلیمری با رویکرد زیست محیطی و اقتصادی ‌می‌باشد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigating the mechanical properties and drying shrinkage of fiber geopolymer repair mortar containing waste from iron and aluminium factories

نویسندگان [English]

  • ّFarid Hatami
  • Malek Mohammad Ranjbar Taklimi
Civil Engineering Department. Technical Faculty, Guilan University, Rasht, Iran
چکیده [English]

In this article, the ground granulated blast furnace slag and red mud, which are the waste products of iron and aluminum factories, were used as aluminosilicate base materials in the mix design of geopolymer repair mortar. The activation of base materials was done with a combination of sodium hydroxide solution (soda) and sodium silicate (water glass).The effect of steel fibers on compressive strength, toughness and drying shrinkage of mortar was investigated. Fiber mortars were used as a repair layer to retrofit brick beams. The results showed that the use of steel fibers in geopolymer mortar can effectively improve compressive strength and toughness, reduce drying shrinkage, and change the brittle fracture behavior of brick beams to a ductile behavior. The results of SEM-EDS test and measurement of Si/Al molar ratio indicated the existence of a three-dimensional and chained structure of geopolymer in the mortar microstructure. The conducted research is an effective and forward step in achieving geopolymeric products with an environmental and economic approach.

کلیدواژه‌ها [English]

  • Geopolymer repair mortar
  • slag
  • red mud
  • steel fiber
  • toughness
  • drying shrinkage

مراجع

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