فصلنامه علمی کارافن

فصلنامه علمی کارافن

بررسی اثر جایگزینی پسماند ماسه حاصل از کارخانۀ سند بلاست با سیمان در مشخصات رئولوژی و مکانیکی بتن

نوع مقاله : مقاله پژوهشی (کاربردی)

نویسنده
گروه مهندسی عمران، دانشگاه فنی و حرفه‌ای، تهران، ایران.
چکیده
سیمان به‌ عنوان اصلی‌ترین مصالح سازندۀ بتن شناخته می‌شود که به ‌علت گران قیمت بودن و آلایندگی و آسیب به محیط زیست در روند تولید بتن همواره محققان به دنبال پیدا کردن جایگزین مناسب برای سیمان هستند. پودر ماسه سیلیس پسماند کارخانۀ سند بلاست به‌ علت دارا بودن سیلیس می‌تواند جایگزین مناسبی باشد که در این پژوهش به بررسی این مهم پرداخته شده است. 164 آژمونه برای سنجش و ارزیابی تأثیر جایگزینی 5، 7.5 و 10 درصدی وزن سیمان با پودر پسماند سیلیس در دو طرح اختلاط عیار سیمان 410 و 460 کیلوگرم در متر مکعب پرداخته شده است. مقاومت 90 روزه بتن با جایگزینی 5 درصد در طرح اختلاط با عیار 460 کیلوگرم در هر متر مکعب ،10 درصد افزایش مقاومت را به دنبال داشته است و در سایر طرح اختلاط‌ها نیز تفاوت مقاومت چشمگیری رخ نمی‌دهد که خود این عدم تغییر نشان دهندۀ قابل قبول بودن پودر سیلیس به عنوان جایگزین مناسب با سیمان از منظر مقاومت می‌باشد. درصد جذب آب بتن با توجه به افزایش پودر سیلیس کاهش قابل توجه 20 درصدی رخ می‌دهد که به دلیل ریزساختار بودن سیلیس و پرکردن خلل و فرج بتن اتفاق می‌افتد. با توجه به نتایج به دست آمده در صورتی که بتوان از پودر پسماند سیلیس که خود یک معضل محیط زیستی در صنعت به حساب می‌آید جایگزین سیمان گردد می‌تواند از منظر اقتصادی 5 درصد سیمان کمتر در بتن استفاده نمود و کمک شایانی به جلوگیری از آلودگی محیط زیست نمود.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Investigating the Effect of Silica Fume Waste Powder of Sand Blasting as Cement Replacement in the Rheological and Mechanical Properties of Concrete

نویسنده English

AmirHossein Moharrer
Department of Civil Engineering, Technical and Vocational University (TVU), Tehran, Iran.
چکیده English

Cement is known as the main building material in concrete production. Due to its high cost and environmental pollution and damage during the production process, researchers are always searching for suitable alternatives to cement. Silica fume waste powder from the sandblasting factory, due to its silica content, can be a suitable substitute and was the subject under investigation in the present study. 164 specimens were prepared to measure and evaluate the effect of substituting 5%, 7.5%, and 10% by weight of cement with silica waste powder in two mix designs of 410 and 460 kilograms per cubic meter. The 90-day compressive strength of concrete with 5% substitution in the 460-kilogram mix design showed an increase of 10% in strength, and in other mix designs, no significant change in strength was observed, indicating the acceptability of silica waste powder as a suitable substitute for cement in terms of strength. The water absorption percentage of concrete decreased significantly by 20% with the increase of silica waste powder due to its fine structure and filling the pores and voids of concrete. Based on the results, if silica waste powder, which itself is an environmental problem in the industry, can be used as a cement substitute, it is possible to use 5% less cement in concrete economically and help prevent environmental pollution.

کلیدواژه‌ها English

Cement Replacement
Silica Fume Waste Powder Concrete
Compressive Strength
Green Concrete
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دوره 21، شماره 3
فنی و مهندسی
پاییز 1403
صفحه 325-346

  • تاریخ دریافت 08 مرداد 1402
  • تاریخ بازنگری 21 مرداد 1402
  • تاریخ پذیرش 08 شهریور 1402