تأثیر آب مغناطیسی و پوزولان‌های مختلف بر خواص بتن تازه و سخت شده خودتراکم

نوع مقاله: علمی - پژوهشی

نویسندگان

1 دانشیار، دانشکده مهندسی عمران، دانشگاه سمنان، سمنان، ایران

2 استاد، دانشکده مهندسی عمران، دانشگاه سمنان، سمنان، ایران

3 دانشجوی دوره دکتری مهندسی سازه، دانشکده مهندسی عمران، دانشگاه سمنان، سمنان، ایران

چکیده

بتن خودتراکم، بتنی است که می‌تواند در فضای فشرده بین آرماتورها، بدون جداشدگی دانه‌ها جریان یابد و تنها در اثر وزن خود متراکم گردد. هدف از این مقاله، بررسی خواص مهندسی بتن خودتراکم حاوی آب مغناطیسی با جایگزینی بخشی از سیمان مصرفی با پوزولان‌های میکروسیلیس، متاکائولن، خاکستر پوسته شلتوک برنج و خاکستر بادی در نسبت‌های 10 و 20 درصد وزنی مواد سیمانی می‌باشد. بدین منظور رفتار بتن خودتراکم در حالت تازه توسط آزمایش‌های جریان اسلامپ، زمان جریان 50 سانتی‌متر(T50)، زمان عبور بتن از قیف V، نسبت انسداد در جعبه Lو شاخص پایداری چشمی بررسی شده است. خواص بتن سخت شده خودتراکم با تعیین مقاومت‌های فشاری و کششی(شکافت نمونه استوانه‌ای) در سنین 7 و 28 روز و مشخصه دوام نمونه‌های بتنی با انجام آزمایش درصد جذب آب در سن 28 روز مورد ارزیابی قرار گرفته است. همچنین به منظور تأثیر آب مغناطیسی با شدت میدان 8/0 تسلا در نتایج، نمونه‌هایی با آب معمولی نیز ساخته شده است. نتایج‌ به دست آمده از بتن تازه در آزمایشگاه نشان می‌دهد که آب مغناطیسی و پوزولان‌های مورد استفاده، موجب بهبود شرایط خودتراکمی بتن از لحاظ جریان‌پذیری و ویسکوزیته می‌شوند. بر این اساس، آب مغناطیسی می‌تواند میزان مورد نیاز کاهنده شدید آب برای بتن خودتراکم را با حفظ جریان اسلامپ، تا 45 درصد کاهش دهد. نتایج‌ بتن سخت شده نیز حاکی از بهبود خواص مقاومتی و پایایی بتن خودتراکم حاوی آب مغناطیسی و پوزولان‌های مصرفی می‌باشد. بر این اساس، می‌توان اختلاط حاوی آب مغناطیسی و جایگزینی 20 درصد میکروسیلیس را با افزایش 48 و 35 درصد به ترتیب در مقاومت فشاری و مقاومت کششی و کاهش 55 درصد در میزان جذب آب در سن 28 روزه، به عنوان طرح بهینه انتخاب کرد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

The Effect of Magnetic Water and Different Pozzolanic Materials on The Fresh and Hardened Properties of Self-Compacted Concrete

نویسندگان [English]

  • majid Gholhaki 1
  • Ali Kheyroddin 2
  • Mohammad Hajforoosh 3
1 Associate Professor, Faculty of Civil Engineering, Semnan University, Semnan, Iran
2 Professor, Faculty of Civil Engineering, Semnan University, Semnan, Iran
3 PhD candidate in Structural Engineering, Faculty of Civil Engineering, Semnan University, Semnan, Iran
چکیده [English]

self-compacted concrete(SCC) is a concrete that can flow in the space between reinforcement without separation and compact only by their own weight. In this study, the effect of using silica fume, metakaolin, rice husk ash and fly ash with different ratios of 10% and 20% by weight of cement in self-compacting concrete containing magnetic water is concered. The fresh properties of self compacted concrete were's tested by means of slump flow, T50, V-funnel, L-box and visual stability index(VSI). The hardened properties were assessed, using compressive strength at the ages of 7 and 28 days. Also splitting tensile strength and water absorption test were assessed at the age of 28 days. In addition, concrete specimens were made using tap water and magnetic water, was passed through a magnetic field of 0.8 Tesla. The results show that pozzolanic materials are suitable in properties of self-compacting concrete containing magnetic water in terms of flowability and viscosity. Moreover, magnetic water can reduce the amount of superplasticizer, required for SCC, up to 45%. Also the results of hardened SSC show an improvement in mechanical and durability properties of concrete. The usage of silica fume with ratio 20% by weight of cement in self-compacting concrete containing magnetic water, increases the compressive and splitting tensile strengths by 48% and 35% respectively and decreases amount of water absorption by 55% at the age of 28 days

کلیدواژه‌ها [English]

  • Magnetic water
  • Self-Compacted Concrete
  • Silica fume
  • Metakaolin
  • Rice Husk Ash
  • Fly ash

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