چقرمگی و دوام بتن سنگدانه بازیافتی ساخته شده با آب مغناطیسی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه عمران، دانشکده مهندسی، دانشگاه فردوسی مشهد، مشهد، ایران

2 گروه 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

موضوعات

عنوان مقاله [English]

The Toughness And Durability Of Recycled Aggregate Concrete Made With Magnetic Water

نویسندگان [English]

  • Ali Abdallah Youssef 1
  • Mohammad Reza Esfahani 2
1 Department Of Civil Engineering, Faculty Of Engineering, Ferdowsi University Of Mashhad, Mashhad, IRAN
2 Department of Civil Engineering, Faculty of Engineering, Ferdowsi University Of Mashhad (FUM)
چکیده [English]

Abstract
In this study, the toughness and durability of concrete with recycled aggregates and magnetic water against melting and freezing cycles and mechanical properties such as compressive and tensile strengths are investigated. Variables include the number of different cycles of water in the magnetic field, different amounts of super-plasticizer, steel fibers and micro-silica. A total of 242 samples were made in 11 different mix designs. It should be noted that half of the samples mentioned contains steel fibers. The results of most experiments have shown that magnetic water, although having a very high effect on the mechanical properties of concrete, should not be used alone as a compensating agent for defects caused by recycled aggregates. Using microsilica as a mineral admixture with magnetic water improves the concrete properties, significantly. The toughness indices were determined by ASTM C1018, JSCE and PCS method and concrete durability test by BS EN 140: 2003. Among the recycled aggregate concrete mixes, the best toughness results were for the samples containing microsilica and steel fibers. Also, ten round magnetic water resulted in an increase in the durability of recycled aggregate concrete by approximately 25% compared to one round of magnetization.

کلیدواژه‌ها [English]

  • Recycled Aggregates concrete
  • Magnetized Water
  • Durability
  • Toughness
  • Steel Fibers

مراجع

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