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بررسی آزمایشگاهی تاثیر درشت دانه های بتنی بازیافتی بر خواص مرتبط با دوام بتن های تماماً بازیافتی حاوی پوزولان | ||
تحقیقات بتن | ||
دوره 15، شماره 2 - شماره پیاپی 38، تیر 1401، صفحه 79-96 اصل مقاله (1.08 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22124/jcr.2022.19278.1491 | ||
نویسندگان | ||
سیدفتح اله ساجدی* 1؛ حسن جلیلی فر2 | ||
1دانشیار، گروه عمران، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران | ||
2گروه عمران، واحد اهواز، دانشگاه آزاد اسلامی، اهواز، ایران | ||
چکیده | ||
تحقیق آزمایشگاهی حاضر به بررسی دو خاصیت مکانیکی و بهویژه دوام بتنهای تماما بازیافتی حاوی پوزولانهای زئولیت طبیعی، میکروسیلیس و خاکستربادی پرداخته است. بتنهای بازیافتی متشکل از درشتدانههای بتنی بازیافت شده و حاوی درصدهای مختلف جایگزینی میکروسیلیس، خاکستربادی و زئولیت طبیعی میباشند. در مجموع 11 طرح اختلاط ساخته شدند که شامل بتن معمولی مرجع، بتن %100 بازیافتی بدون پوزولان و 9 طرح اختلاط از بتنهای تماما بازیافتی حاوی مواد پوزولانی مذکور به صورت کاربردهای جداگانه می-باشند. برای بررسی و مقایسه برخی از خواص مکانیکی و بهویژه خواص وابسته به دوام این نوع بتنها، در بازه سنی 28 تا 91 روزه، مقاومت فشاری، در بازه سنی 28 روزه سرعت انتشار امواج فراصوت، و در بازه سنی 180 روزه نیز آزمایشهای جذب آب غوطهوری، جذب آب مویینه، مقاومت ویژه الکتریکی و ضریب هدایت الکتریکی نمونههای ساخته شده از این نوع بتنها، اندازهگیری شدند. نتایج نشان دادند که گرچه جایگزینی کامل درشتدانههای بازیافتی در این نوع بتنها منجر به افت مقاومت فشاری آنها نسبت به بتن مرجع میشود، ولی جایگزینی مواد پوزولانی مانند میکروسیلیس در بتنهای تماما بازیافتی قادر است تا منجر به کسب مقاومت فشاری بیشتری نسبت به بتن مرجع گردد. همچنین میزان افت خواص وابسته به دوام در بتنهای تماما بازیافتی بدون پوزولان نسبت به بتن مرجع، در مقایسه با افت حاصله در خواص مکانیکی به مراتب بیشتر است. با اینحال بهدلیل تغییر در ساختار شیمیایی بتنهای بازیافتی ناشی از مواد پوزولانی مانند زئولیت طبیعی، برخی از خواص وابسته به دوام این بتنها در مقایسه با بتنهای معمولی، تغییر محسوسی نداشتند. | ||
کلیدواژهها | ||
سنگدانه بازیافتی؛ بتن بازیافتی؛ خواص مکانیکی؛ دوام؛ پوزولان | ||
مراجع | ||
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