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

مهندسی عمران فردوسی

مقاله 4، دوره 37، شماره 3 - شماره پیاپی 47، مهر 1403، صفحه 61-76   

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.22067/jfcei.2024.88715.1307

نویسندگان

زهرا حیدری¹؛ رسول شادنیا^{* 2}؛ داود مستوفی نزاد³؛ شادزی رضایی¹

¹گروه مهندسی عمران، دانشگاه حکیم سبزواری،

²گروه مهندسی عمران، دانشگاه حکیم سبزواری.

³دانشکده عمران، دانشگاه صنعتی اصفهان.

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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