بررسی آزمایشگاهی جایگزینی درصدهای مختلف زئولیت با سیمان بر بهبود مشخصات مکانیکی و دوام بتن در دماهای بالا

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه مهندسی عمران، دانشکده مهندسی، دانشگاه بین المللی امام خمینی (ره)، قزوین، ایران

چکیده

یکی از مهمترین عوامل آلودگی محیط زیست تولید سیمان و یکی از عوامل آسیب به سازه‌های بتن آرمه دماهای بالا می‌باشد. در این مطالعه تاثیر جایگزینی 10 و 20 درصد وزنی سیمان با زئولیت بر مشخصات مکانیکی و دوام سازه‌های بتنی بررسی شده است. مشخصات مکانیکی شامل مقاومت فشاری و مقاومت کششی در حالت داغ و مشخصات دوام شامل جذب آب سطحی، عمق نفوذ آب، مقاومت الکتریکی و افت وزنی بتن حرارت دیده است. دماهای بررسی شده بازه دمایی 28 تا 800 درجه سانتیگراد است. نتایج نشان داد که جایگزینی سیمان با زئولیت موجب کاهش جزئی مقاومت فشاری و کششی 28 و 42 روزه بتن معمولی شده است. این بررسی در دماهای بالا نشان داد که اگرچه جایگزینی درصدی از سیمان با زئولیت مقاومت فشاری بتن معمولی را به میزان کمی کاهش داده است، در رابطه با مقاومت فشاری نرمال شده در بیشتر دماهای آزمایش موجب بهبود این پارامتر شده است. علاوه بر این، ملاحظه گردید برای جایگزینی 10 و 20 درصد وزنی سیمان با زئولیت مقاومت کششی بتن در دماهای بالا را به ترتیب 21 و 13 افزایش داده است. این بررسی در رابطه با مقاومت کششی نرمال شده بتن در دماهای بالا برای درصدهای یاد شده، به ترتیب افزایش 22 و 14 درصدی را نشان داد. در رابطه با مشخصات دوام بتن ملاحظه گردید که اگرچه افزایش دمای آزمایش مشخصات دوام بتن معمولی را دچار آسیب کرده است، جایگزینی زئولیت با سیمان موجب بهبود آن مشخصات شده است. نتایج به نحوی بود که بهترین عملکرد دوام بتن، در نمونه‌های حاوی درصدهای بالاتر زئولیت حاصل گردید.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Evaluation of various content of zeolite on the mechanical and durability properties of concrete at high temperatures

نویسندگان [English]

  • RAMEZAN ALI IZADIFARD
  • Mehrdad Abdi Moghadam
Civil Eng. Dep., Engineering Faculty, Imam Khomeini Int. Un., Qazvin, Iran
چکیده [English]

One of the major environmental contamination factors is cement production and of major damaging factors of reinforced concrete structures is high temperatures. In this study, the effect of substitution of 10 and 20% of cement weight with zeolite on mechanical and durability properties of concrete structures at high temperatures has been investigated. Mechanical properties including compressive and tensile strength of concrete in the hot condition and the durability characteristics of the concrete after cooling, including surface water absorption, the penetration depth of water, electrical resistance and weight loss have been investigated. This study covers temperatures of 28 to 800 °C. The results showed that the replacement of cement with zeolite reduced the compressive strength and tensile strength of 28 and 42 days. This assessment at high temperatures showed that although the replacement a portion of cement with zeolite decreased the compressive strength of normal concrete, the normalized compressive strength improved at most tested temperatures. In addition, it was observed that by substitution 10 and 20% of cement weight with zeolite, the tensile strength of normal concrete at high temperatures increased by 21 and 13 percent averagely. This improvement for normalized tensile strength was 22 and 14%, respectively for mentioned substitution. Although the increase in the test temperature has had adverse effects on the durability of concrete, the replacement of cement with zeolite has improved the durability specification. The best durability properties of concrete were achieved in samples containing higher content of zeolite.

کلیدواژه‌ها [English]

  • zeolite
  • Mechanical Properties
  • durability properties
  • high temperature
  • content of zeolite
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