نشریه مهندسی عمران امیرکبیر

نشریه مهندسی عمران امیرکبیر

امکان‌سنجی ساخت بتن سبک سازه‌ای با استفاده از سنگدانه‌های سبک لیکا و پلی‌اتیلن ترفتالات و تعیین خواص مکانیکی آن

نوع مقاله : مقاله پژوهشی

نویسندگان
گروه مهندسی عمران، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران
چکیده
توجه به سبک‌سازی در ساختمان‌سازی نوین و نیاز به تولید و استفاده از بتن‌های سبک در ساختمان‌های بلند نیز باعث شده که محققان به استفاده از مصالح مصنوعی سبک روی آورند. هدف تحقیق این است که در تولید بتن سبک سازه‌ای، به جای استفاده از ماسه طبیعی، ماسه لیکا mm (4-0) جایگزین شود. بنابراین، چهار طرح مخلوط با ماسه لیکا و نسبت آب به سیمان در طرح‌های اول و سوم به میزان kg/m3 ۶۰۰ و 0/42 و در طرح‌های دوم و چهارم به میزان kg/m3 2۰۰ و 0/35 ساخته شدند. پس از تعیین مقاومت فشاری نمونه‌ها، طرح مخلوط چهارم به عنوان طرح مرجع مشخص گردید. در ادامه سه طرح مخلوط جدید با جایگزین‌های %10، %20 و %30 از سنگدانه‌های پلی‌اتیلن ترفتالات و ماسه لیکا ساخته شدند. نمونه‌های مکعبی و استوانه‌ای استاندارد به ترتیب برای تعیین مقاومت فشاری و ضریب ارتجاعی استاتیکی تهیه و تا سن 28 روزه در آب عمل‌آوری شدند. برای تمام طرح‌ مخلوط‎ها، آزمایش‌های اسلامپ و وزن مخصوص در حالات تازه و سخت شده بتن انجام شدند. نتایج نشان داد که طرح دارای %10 جایگزینی پلی‌اتیلن ترفتالات با ماسه لیکا، در مقادیر مقاومت فشاری و ضریب ارتجاعی استاتیکی به ترتیب به میزان %18/4 و %6/1 نسبت به طرح مخلوط مرجع افزایش حاصل شده است. نتایج نشان دادند که می‌توان با استفاده از سنگدانه‌های پلی‌اتیلن ترفتالات، نسبت به ساخت بتن سبک سازه‌ای اقدام نمود، حتی به‌گونه‌ای که این نوع بتن دارای خواص مکانیکی برتر نسبت به بتن مرجع باشد.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Feasibility study of lightweight structural concrete using LECA and PET and determination of its mechanical properties

نویسندگان English

Seyed Fathollah Sajedi
Ali Lefte Naami
Professor, Department of Civil Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran
چکیده English

Attention to lightness in modern construction and the need to produce and use lightweight concrete in tall buildings has also led researchers to use lightweight synthetic materials. The aim of the research is to replace natural sand with 0-4 mm LECA sand in the production of lightweight structural concrete. Therefore, four mix designs were made with LECA sand and water-to-cement ratios of 600 and 0.42 kg/m3 in the first and third designs, and 200 and 0.35 kg/m3 in the second and fourth designs. After determining the compressive strength of the samples, the fourth mix design was determined as the reference design. Next, three new mix designs were made with 10%, 20%, and 30% replacements of polyethylene terephthalate aggregates and LECA sand. Standard cubic and cylindrical samples were prepared to determine the compressive strength and static modulus of elasticity, respectively, and were cured in water for 28 days. For all mix designs, slump and specific gravity tests were performed in the fresh and hardened states of the concrete. The results showed that the design with 10% polyethylene terephthalate replacement with LECA sand achieved an increase in compressive strength and static modulus of elasticity of 18.4% and 6.1%, respectively, compared to the reference mix design. The results showed that it is possible to use polyethylene terephthalate aggregates to produce structural lightweight concrete, even in such a way that this type of concrete has superior mechanical properties compared to the reference concrete.

کلیدواژه‌ها English

Structural Lightweight Concrete
Polyethylene Terephthalate Aggregates
Manufacturing Feasibility
Mechanical Properties
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