بررسی مشخصات مکانیکی بتن‌های سازگار با محیط زیست و مسلح شده با الیاف فولادی با تأکید بر انتخاب طرح اختلاط‌های بهینه اقتصادی و مقاومتی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناس ارشد مهندسی عمران، دانشگاه لرستان، خرم آباد، ایران

2 گروه عمران، دانشکده فنی و مهندسی، دانشگاه لرستان

3 دانشجوی کارشناس ارشد مهندسی عمران، دانشگاه لرستان، خرم آباد، ایران.

چکیده

هدف اصلی محققین در این تحقیق بررسی امکان ساخت بتن‌های سازگار با محیط زیست است. برای تحقق این هدف، نخاله‌های بتنی بازیافت و مجدداً در ساخت بتن استفاده شدند. از طرفی با توجه به ایجاد حجم بالایی از آلودگی‌های زیست‌محیطی در فرآیند تولید سیمان، این ماده با سرباره GGBFS جایگزین شد. بنابراین، در این تحقیق طرح اختلاط‌هایی با جایگزینی 0%، 50% و 100% سنگدانه‌های طبیعی (NA) با سنگدانه‌های حاصل از بازیافت نخاله‌های بتنی (RCA) و 0%، 15% و 30% درصد سیمان پرتلند معمولی (OPC) با سرباره GGBFS مورد بررسی قرار گرفت. علاوه بر این، طرح اختلاط‌ها با 0%، %0/5 و 1% الیاف فولادی دو سر قلاب مسلح شدند. در مجموع بر روی 27 طرح اختلاط آزمایشات متنوعی همچون اسلامپ، سرعت موج اولتراسونیک، جذب آب، مقاومت فشاری، کششی و خمشی انجام شد. نتایج نشان داد که استفاده از RCA و GGBFS بر روی کارایی و مقاومت فشاری بتن تأثیر منفی دارد. در نهایت با انجام آنالیز اقتصادی و انجام بهینه‌یابی در بین طرح اختلاط‌ها نتیجه گرفته شد که استفاده از RCA به عنوان جایگزین NA تا 50% و استفاده از GGBFS به عنوان جایگزین OPC تا 30% از لحاظ مقاومتی و اقتصادی توجیه‌پذیر است. علاوه بر این، نتایج نشان داد که ضعف حاصل از استفاده از RCA و GGBFS با افزودن الیاف فولادی قابل جبران است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Assessment of Mechanical Properties of Environmentally Friendly Concrete with Emphasis on Selection of Optimal Mix Designs in Terms of Resistance and Economy

نویسندگان [English]

  • Amirhosein Sahraei Moghadam 1
  • Saeideh Moazami Goodarzi 3
1 M.Sc., Faculty of Engineering, Lorestan University, Khorramabad, Iran
3 M.Sc., Faculty of Engineering, Lorestan University, Khorramabad, Iran.
چکیده [English]

The main purpose of this study is to investigate the possibility of constructing environmentally friendly concrete. To achieve this purpose, the concrete waste was recycled and reused in constructing concrete. On the other hand, due to the high volume of environmental pollutants in the ordinary Portland cement (OPC) manufacturing process, OPC was replaced with ground granulated blast furnace slag (GGBFS). Therefore, this study was investigated the mixing designs by 0, 50 and 100% natural aggregates (NA) replaced with recycled concrete aggregates (RCA) and 0, 15, and 30% OPC with GGBFS. In addition, the mixing designs were reinforced with 0, 0.5, and 1% hooked-end steel fiber. In total, this study was investigated 27 different mix designs containing RCA, GGBFS, and steel fibers. Various tests such as slump, water absorption, UPV, compressive, splitting tensile, and flexural strength were performed on specimens. The results showed that using RCA and GGBFS had a negative effect on the workability and compressive strength of concrete. Finally, by economic analysis and optimization of mixing designs, it was concluded that it is justified in terms of resistance and economy to use RCA as a replacement for NA to 50% and the use of GGBFS as a replacement for OPC to 30%. Furthermore, the results showed that the weakness of using RCA and GGBFS can be compensated by adding steel fibers.

کلیدواژه‌ها [English]

  • Mechanical Properties
  • Recycled concrete
  • GGBFS
  • Steel Fibers
  • optimization
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