کارایی، مشخصات مکانیکی و دوام بتن خودتراکم حاوی گل قرمز و پودر سنگ مرمر و گرانیت

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی، دانشگاه فردوسی مشهد، مشهد، ایران

2 دانشکده مهندسی، دانشگاه الزهرا (س)، تهران، ایران.

چکیده

نیاز به ویسکوزیته بالا در بتن خودتراکم به منظور حفظ یکنواختی و عدم جداشدگی ذرات، زمینه را برای کاربرد ماده پودری در طرح اختلاط این نوع بتن هموار ساخته است. تولید ضایعات پودری نزدیک به 50 درصدی در مراحل مختلف سنگ‌بری و نیاز به دفن این ضایعات نگرانی‌هایی را از نظر زیست‌محیطی در پی دارد. از سوی دیگر، امروزه پژوهش‌گرانی با دغدغه‌های زیست‌محیطی و همچنین اقتصادی استفاده‌ از مواد جایگزینِ سیمان در طرح اختلاط بتن و در نتیجه کاهش تولید گاز کربن‌دی‌اکسید ناشی از تولید سیمان را لازم می‌دانند. دفن گل‌قرمز خام که به عنوان ضایعات کارخانه آلومینیوم‌سازی شناخته می‌شود، با اثرات مخرب زیست‌محیطی برای خاک، آب و هوای اطراف سدهای باطله همراه است. در این طرح پژوهشی تاثیر استفاده از گل‌قرمز به عنوان جایگزین بخشی از سیمان در طرح اختلاط بتن خودتراکم مورد پرسش قرار می‌گیرد. همچنین از ضایعات کارخانه‌های سنگ‌بری (پودر سنگ‌های مرمریت و گرانیت) به عنوان ماده پرکننده در بتن خودتراکم استفاده شده است. کارایی، مشخصات مکانیکی و دوام بتن خودتراکم با استفاده از آزمایش‌های مناسب سنجیده شد. هر چند گل‌قرمز خام خاصیت پوزلانی ندارد، ریزدانه بودن ذرات آن سبب متراکم شدن ماتریس بتن در درصدهای جایگزینی کم (تا 5 درصد) شده است. از سوی دیگر نشان داده می‌شود که استفاده از پودر سنگ­‌های مرمیت و گرانیت به جای پودر سنگ آهک در بتن خودتراکم از نظر کارایی، مقاومتی و دوام مشکلی را در پی نخواهد داشت.     

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Workability, mechanical properties and durability of self-compacting concrete containing red mud, and granite and marble waste powder

نویسندگان [English]

  • Mansour Ghalehnovi 1
  • Naeim Roshan 1
  • Mehrollah Rakhshani Mehr 2
1 Department of Civil Engineering, Ferdowsi University of Mashhad
2 Mehrollah Rakhshanimehr, Department of Civil Engineering, Alzahra University.
چکیده [English]

To maintain the uniformity and cohesiveness of self-compacting concrete (SCC), sustainable use of waste powder like waste marble powder (WMP) and waste granite powder (WGP) as filler replacement, and red mud (RM) as a cement replacement has been investigated. Also, the mechanical properties and durability of SCC containing WMP, WGP, and RM were measured by compressive strength (CS), splitting tensile strength (TS), water absorption (WA), ultrasonic pulse velocity (UPV), and acid sulfuric attack tests in the laboratory. When the total amount of filler material (limestone powder (LP)) was replaced by WMP or WGP, the workability, the mechanical properties, and the durability of SCC did not significantly change. Using RM up to 2.5% cement replacement improved the mechanical properties and durability of SCC. However, the higher content of RM in SCC mixes could adversely affect the mechanical properties and durability of SCC. The application of stone waste powder like WMP, WGP, and industrial by-products like RM could lead to a greener and more sustainable SCC mix without sacrificing the SCC’s mechanical properties and its durability.

کلیدواژه‌ها [English]

  • Red mud
  • Self-compacting concrete
  • Marble powder
  • Granite powder
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