تاثیر استفاده از مصالح بازیافتی روی جمع‌شدگی خودزا و مقاومت بتن فوق توانمند

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی عمران، دانشگاه آزاد اسلامی واحد قزوین، قزوین، ایران

2 گروه مهندسی عمران، دانشگاه خوارزمی، تهران، ایران

چکیده

در این تحقیق با به‌کارگیری نسبت‌های مختلف زئولیت طبیعی (%25 و %50 و %75 و %100) به جای میکروسیلیس هدف بر کاهش جمع‌شدگی خودزای بتن فوق توانمند می باشد. نتایج آزمایش‌‌ها نشان دادند با جایگزینی درصدهای مختلف میکروسیلیس با زئولیت طبیعی، رطوبت نسبی داخلی در محدوده بالاتری قرار می گیرد و میزان جمع‌شدگی خودزا کاهش می‌یابد. نتایج آزمایش وزن سنجی گرمایی و آنالیز ریزساختار نشان دادند زئولیت طبیعی فعالیت پوزولانی مناسبی دارد. با توجه به نتایج آزمایش مقاومت فشاری مشاهده گردید با جایگزینی درصدهای مختلف میکروسیلیس با زئولیت طبیعی مقاومت فشاری کاهش پیدا می‌کند. با جایگزینی %50 میکروسیلیس با زئولیت طبیعی نتایج آزمایش مقاومت فشاری اختلاف اندکی با نمونه‌‌های شاهد داشتند. همچنین به منظور کاهش هزینه ساخت بتن فوق توانمند ماسه شیشه‌ای جایگزین ماسه کوارتزی گردید. با جایگزینی ماسه کوارتزی با ماسه شیشه‌ای مقاومت فشاری کاهش یافت ولی نسبت هزینه به مقاومت نمونه‌‌ها کاهش داشته است. در تمامی طرح‌‌ها که از زئولیت طبیعی و ماسه شیشه‌ای استفاده شد، هزینه ساخت نسبت به هزینه ساخت نمونه شاهد پایین تر بود. 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Effect of recycled materials on autogenous shrinkage of ultra-high performance concrete

نویسندگان [English]

  • mohammadreza pezeshkian 1
  • ALI DELNAVAZ 1
  • Mohammad Delnavaz 2
1 Department of CIVIL ENGINEERING , QAZVIN BRANCH, ISLAMIC AZAD UNIVERSITY, QAZVIN, IRAN
2 Faculty of Engineering, Civil Engineering Department, Kharazmi University, Tehran, Iran
چکیده [English]

The study aims is to decrease the silica fume (SF) content of UHPC by using natural zeolite (NZ) with different levels of replacement (25%, 50%, 75%, and 100% by volume), to mitigate autogenous shrinkage with almost equivalent mechanical performance. The results demonstrated that the addition of NZ as a replacement of SF had a positive effect on maintaining internal RH in the higher range as well as in reducing the autogenous shrinkage of UHPC. The mixtures with 25%, 50%, 75%, and 100% replacing SF by NZ had lower autogenous shrinkage compared to reference mixtures containing 100% SF. The results of Thermogravimetric and microstructure analysis indicated that NZ had appropriate pozzolanic activity. The results of the compressive strength test showed that by replacing 50% SF with NZ, the 90 days compressive strength of 164.37 MPa could be achieved, which was only slightly lower than the reference mixture with 90 days compressive strength of 169.07 MPa. replacing SF with NZ yielding a cost-effective solution. By replacing 50% NZ replacement of SF, UHPC mix with 90 days compressive strength over 150 MPa, with low autogenous shrinkage and relatively low cost can be produced. 

کلیدواژه‌ها [English]

  • Natural Zeolite
  • Autogenous Shrinkage
  • UHPC
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