ارزیابی خواص مکانیکی بتن با جایگزینی سنگ‌دانه‌های طبیعی با سنگ‌دانه‌های ریزودرشت بازیافتی

مهندسی عمران فردوسی

مقاله 6، دوره 35، شماره 4 - شماره پیاپی 40، بهمن 1401، صفحه 87-110   

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.22067/jfcei.2022.77651.1164

نویسندگان

عارف سرهنگی؛ فریدون امیدی نسب^* ؛ احمد دالوند

دانشکده فنی و مهندسی، دانشگاه لرستان.

چکیده

سنگدانه‌های بتنی بازیافتی یکی از انواع سنگدانه‌های بازیافتی است که بیشترین فراوانی را نسبت به سایر سنگدانه‌های بازیافتی دارد. در این تحقیق با استفاده از جایگزینی سنگدانه‌های بتنی بازیافتی به ‌جای سنگدانه‌های طبیعی، خصوصیات مکانیکی این نوع بتن­ها مورد بررسی قرار گرفته است. جایگزینی سنگدانه‌های طبیعی با سنگدانه‌های بازیافتی در چهار درصد 0، 15، 30 و 45 انجام شد و این جایگزینی هم به ‌صورت مستقل (شن یا ماسه به‌صورت مجزا) و هم به ‌صورت همزمان (هم شن و هم ماسه با هم) انجام شد. با توجه ‌به استفاده 50 درصد شن و 50 درصد ماسه در طرح اختلاط مرجع و با جایگزینی درصدهای فوق­الذکر با سنگدانه‌های درشت و ریز بتنی بازیافتی تعداد 21 طرح اختلاط مورد استفاده قرار گرفت. نسبت آب به سیمان در همه طرح­های اختلاط ثابت نگه داشته و برابر با 42/0 در نظر گرفته شد. برای جبران کاهش مقاومت ناشی از جایگزینی سنگدانه‌های بازیافتی، از میکروسیلیس در درصدهای مختلف 7،5 و 15 و فوق روان­ کننده در طرح­های اختلاط استفاده شد. با انجام آزمایش‌های مختلف، خواص مکانیکی نمونه­های بتنی مورد بررسی قرار گرفت. نتایج نشان داد که بهترین طرح اختلاط از نظر مقاومت فشاری، طرح حاوی 5/7% میکروسیلیس و 15% شن بازیافتی، از نظر مقاومت کششی، طرح حاوی 5/7% میکروسیلیس و 45% شن بازیافتی، از نظر مقاومت خمشی، طرح حاوی 5/7% میکروسیلیس و 30% شن بازیافتی، طرح حاوی 15% میکروسیلیس و 15% شن بازیافتی مشخص شدند. با بررسی چندمتغیره خواص مکانیکی نمونه­های بتن، مشخص گردید که طرح­های اختلاط بازیافتی حاوی 15%، 30% شن بازیافتی و 45% ماسه بازیافتی با 5/7% میکروسیلیس و همچنین طرح اختلاط 15% ماسه بازیافتی با 15% میکروسیلیس، در بین طرح­های اختلاط بازیافتی، بیشترین مقدار مطلوبیت کلی را به خود اختصاص داده­اند.

کلیدواژه‌ها

سنگدانه بازیافتی؛ سنگدانه طبیعی؛ مقاومت خمشی؛ مقاومت فشاری؛ مقاومت کششی

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