تثبیت پسماند خاک سنگ آهک در بتن خودتراکم و اثر آن بر خواص کارایی، مکانیکی و دوام

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکدة مهندسی عمران، دانشگاه علم و صنعت ایران

2 گروه سازه، زلزله و مدیریت ساخت، دانشکده مهندسی عمران، دانشگاه علم و صنعت ایران

3 کارشناس ارشد مهندسی ژئوتکنیک، مدیر آزمایشگاه دوام بتن شرکت ژیکاوا

4 دانشجوی کارشناسی ارشد محیط زیست موسسه خاوران، مسئول آزمایشگاه بتن شرکت ژیکاوا

چکیده

خاک سنگ آهک پسماندی است که در نتیجه خرد کردن سنگ‌های آهکی جهت تولید سنگدانه مصرفی در بتن بوجود می‌آید. وجود این ماده زائد در طبیعت موجب به وجود آمدن مشکلات گوناگون زیست محیطی می‌گردد. پژوهش حاضر به منظور تثبیت این پسماند در بتن خودتراکم و بررسی اثر آن بر خواص کارایی، مکانیکی و دوام صورت پذیرفته است. بدین منظور 9 طرح مخلوط حاوی درصدهای جایگزینی مختلفی از خاک سنگ آهک و بدون آن در انواع مواد سیمانی حاوی و فاقد میکروسیلیس مورد آزمایش و بررسی قرار گرفته اند. برای بررسی خواص مکانیکی از آزمایش‌های مقاومت فشاری و مقاومت کششی غیر مستقیم و برای بررسی خواص دوام، آزمایش‌های نفوذ یون کلراید (RCPT )و تخلخل باز بر روی نمونه‌های حاوی خاک سنگ آهک و همچنین نمونه شاهد فاقد آن انجام شد. خواص کارایی بتن‌های خودتراکم نیز با انجام آزمایش‌های جعبه L و جریان اسلامپ(Flow Slump )سنجیده شدند. نتایج نتایج نشان داد که نمونه‌های حاوی درصد بهینه ای (حدود 10) از خاک سنگ آهک دارای خواص کارائی، مکانیکی و دوامی بهتری نسبت به نمونه شاهد می‌باشند. در نتیجه با مصرف خاک سنگ آهک به عنوان یک نوع ماده پسماند در بتن‌های خودتراکم، علاوه بر بهبود خواص کارایی، مکانیکی و دوام، می توان در راستای تأمین اهداف توسعه پایدار و حفظ محیط زیست گام برداشت.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Stabilization of limestone dust in self-compacting concrete and its effect on workability, mechanical and durability properties

نویسندگان [English]

  • MohammadAmin HamediRad 1
  • Sajjad Mirvalad 2
  • Masoud Attarian 3
  • Mohamad Ebrahim Kianifar 4
1 School of Civil Engineering, Iran University of Science and Technology
2 School of Civil Engineering, Iran University of Science and Technology
3 MSc in Structural Engineering, Zhikava Company, Mashhad, Iran.
4 MSc Student in Environmental Engineering, Khavaran Institute Technician, Concrete Laboratory, Zhikava Company, Mashhad, Iran
چکیده [English]

Limestone dust is the by-product of limestone grinding in the process of concrete aggregate production. Such waste material causes various environmental problems. The present experimental study has focused on stabilization of limestone dust in self-consolidating concrete (SCC) in order to decrease its negative environmental effects; the workability, mechanical and durability properties of different SCC samples were investigated. With that regards, nine SCC mixtures containing different percentages of limestone dust, Portland cement and silica fume were devised and casted. Overall, compressive strength, indirect tension, rapid chloride penetration, density, absorption, voids, slump flow, and L Box tests were performed on all mixtures. Considering the results, concrete mixtures which contained 10 percent limestone dust performed the best compared to the control sample and other blends form the point of view of workability, compressive and tensile strength, absorption, and resistance against chloride ions penetration. Accordingly, in addition to stabilization of limestone dust in concrete, which well satisfies the global approach towards sustainable development, workability, mechanical, and durability properties of SCC samples were considerably improved.

کلیدواژه‌ها [English]

  • Limestone dust
  • waste
  • self-consolidating concrete
  • Durability
  • Sustainable Development
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