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چقرمگی و دوام بتن سنگدانه بازیافتی ساخته شده با آب مغناطیسی | ||
تحقیقات بتن | ||
مقاله 3، دوره 14، شماره 1 - شماره پیاپی 33، فروردین 1400، صفحه 37-55 اصل مقاله (1.09 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22124/jcr.2021.15207.1412 | ||
نویسندگان | ||
علی عبدالله یوسف1؛ محمدرضا اصفهانی* 2 | ||
1گروه عمران، دانشکده مهندسی، دانشگاه فردوسی مشهد، مشهد، ایران | ||
2گروه مهندسی عمران ،دانشکده مهندسی، دانشگاه فردوسی مشهد ،مشهد | ||
چکیده | ||
چکیده در این تحقیق، چقرمگی و دوام بتن با سنگدانه بازیافتی و آب مغناطیسی در برابر چرخههای ذوب و انجماد و خواص مکانیکی نظیر مقاومتهای فشاری و کششی بررسی میشود. متغیرها شامل تعداد چرخههای مختلف آب در میدان مغناطیسی، مقدارهای مختلف فوق روانکننده، الیاف فولادی و میکروسیلیس میباشند. مجموعا 242 نمونه در 11 طرح مختلف ساخته شد. لازم به ذکر است که نیمی از نمونه های ذکر شده دارای الیاف فولادی میباشند. نتایج اغلب آزمایشات نشان داد که آب مغناطیسی با اینکه تاثیر زیادی در خواص مکانیکی بتن داشته اما نباید از آن به تنهایی به عنوان عامل جبران کنندهی نقصهای ناشی از سنگدانههای بازیافتی استفاده کرد. استفاده از افزودنی معدنی میکروسیلیس به همراه آب مغناطیسی، خواص بتن را به مقدار زیادی بهبود میبخشد. شاخصهای چقرمگی توسط استانداردهایASTM C1018 ، JSCE و روشPCS و آزمایش دوام بتن توسط استانداردBS EN 140:2003 انجام شد. از بین بتنهای دارای سنگدانه بازیافتی، بهترین نتایج چقرمگی مربوط به نمونههای حاوی میکروسیلیس و الیاف فولادی بود. همچنین، ده دور مغناطیسی کردن آب طرح اختلاط منجر به افزایش دوام بتن سنگدانه بازیافتی حدود 25% در مقایسه با یک دور آن شد. | ||
کلیدواژهها | ||
بتن سنگدانههای بازیافتی؛ آب مغناطیسی؛ دوام؛ چقرمگی؛ الیاف فولادی | ||
مراجع | ||
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