تاثیر روش استفاده از کیک‌کربناته ضایعاتی بر‌روی مقاومت‌فشاری و کششی بتن سبز

نوع مقاله : مقاله پژوهشی

نویسندگان

• زهرا حیدری ¹
• رسول شادنیا ²
• داود مستوفی نزاد ³
• شادزی رضایی ¹

¹ گروه مهندسی عمران، دانشگاه حکیم سبزواری،

² گروه مهندسی عمران، دانشگاه حکیم سبزواری.

³ دانشکده عمران، دانشگاه صنعتی اصفهان.

10.22067/jfcei.2024.88715.1307

چکیده

حجم زیادی از ضایعات کارخانه‌های قند به‌صورت پسماند انباشت می‌شود. هدف تحقیق حاضر، بازیافت پسماند حجیم این کارخانجات، با ‌نام کیک‌کربناته (گل کربنات‌کلسیم، آهک کربناته و لجن‌آهک)، که تولید آن معظل جدی این کارخانجات و محیط زیست است، به‌عنوان جایگزین بخشی از سیمان مورد‌استفاده در بتن می‌باشد. بدلیل اندازه ناهمگن ذرات و برای شباهت بیشتر اندازه دانه‌های آن با ذرات سیمان، کیک‌کربناته با سه‌روش حل‌شده در آب طرح اختلاط، الک‌شده وآسیاب‌شده در طرح‌های مختلف مورد‌استفاده قرار گرفت. نمونه های بتنی آزمایشگاهی با نسبت آب به سیمان 0.35 و با درصدهای مختلف جایگزینی کیک کربناته به جای سیمان برابر با ۵، ۱۰، ۲۰، ۳۰ و ۴۰ ساخته شده و در نهایت مقاومت فشاری نمونه های 28 و 56 روزه و مقاومت کششی نمونه های 28 روزه سنجیده شد. نتایج نشان داد که بهترین روش استفاده از کیک‌کربناته در بتن، استفاده از کیک‌کربناته آسیاب‌شده می‌باشد و جایگزینی آن تا حداقل 20 درصد وزنی سیمان با این روش، بدون کاهش چشمگیر مقاومت‌های فشاری و کششی در بتن امکان‌پذیر می‌باشد؛ به صورت کمی نتایج حاکی از آن است که مقاومت فشاری نمونه‌های 28 و 56 روزه و مقاومت کششی نمونه های 28 روزه با 20 درصد پودر ضایعاتی جایگزین سیمان نسبت به نمونه‌های شاهد بدون پودر در این روش، بترتیب حدود 6.5، 10 و 5.4 درصد کاهش داشته‌اند. شایان ذکر است که بازیافت کیک‌کربناته سبب‌کاهش در‌پسماندهای صنعتی، هزینه حمل‌و‌نقل ضایعات، هزینۀ دفن پساب‌ها و حذف بوی نامناسب و ‌مواد آلی نیز می‌گردد. استفاده از این بتن سبز در صنعت ساختمان توصیه می‌شود.

کلیدواژه‌ها

• ضایعات کارخانه قند
• بازیافت
• کیک کربناته
• مقاومت
• بتن سبز

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عنوان مقاله [English]

The effect of the method of using waste carbonate cake on the compressive and tensile strength of green concrete

نویسندگان [English]

• Zahra Heydari ¹
• Rasoul Shadnia ²
• Davood Mostofinejad ³
• Shadzi Rezaei ¹

¹ Faculty of Engineering, Hakim Sabzevari University, Sabzevar, Iran.

² Faculty of Engineering, Hakim Sabzevari University, Sabzevar, Iran.

³ Faculty of Civil Engineering, Isfahan University of Technology, Isfahan, Iran.

چکیده [English]

A large amount of waste from sugar factories is accumulated as waste. The purpose of this research is to recycle the waste of these factories, called carbonate cake (calcium carbonate mud, lime carbonate and lime sludge), which production is a serious problem for these factories and the environment, as a substitute for part of cement used in concrete. Due to the heterogeneous size of particles and for the greater similarity of the size of its grains with cement particles, carbonated cake with three methods: dissolved in water of mixing plan, sieved and ground, was used in different designs. Laboratory concrete samples were made with a water-cement ratio of 0.35 and with different percentages of replacing carbonate cake instead of cement equal to 5, 10, 20, 30 and 40, and finally, the compressive strength of 28- and 56-day samples and the tensile strength of 28-day samples was measured. It is possible to replace it up to at least 20% by weight of cement, without significantly reducing the compressive and tensile strengths in concrete; Quantitatively, the results indicate that the compressive strength of 28- and 56-day samples and tensile strength of 28-day samples with 20% waste powder instead of cement have decreased by 6.5, 10, and 5.4%, respectively, compared to the control samples without powder. It is worth noting that carbonate cake recycling causes reduction in industrial waste, waste transportation cost, waste disposal cost and removing inappropriate smell and organic materials. The use of this green concrete in construction industry is recommended.

کلیدواژه‌ها [English]

• Sugar factory waste
• recycling
• carbonate cake
• strength
• green concrete

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