کارایی و مقاومت فشاری بتن خودتراکم حاوی خاکستر پوسته برنج حاصل از سوختن کنترل‌شده و کنترل نشده

نوع مقاله : مقاله پژوهشی

نویسندگان

1 - استادیار، گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه صنعتی خاتم الانبیا(ص) بهبهان، بهبهان، ایران

2 دانشجوی کارشناسی ارشد سازه، دانشگاه صنعتی خاتم الانبیا بهبهان

3 گروه عمران، دانشکده صنعت و معدن چرام، دانشگاه یاسوج، چرام، ایران

10.22124/jcr.2024.26208.1638

چکیده

پوسته برنج یک ماده زائد کشاورزی با مقدار زیادی سیلیس آمورف است که افزودن خاکستر آن به بتن موجب افزایش خاصیت پوزولانی بتن و افزایش مقاومت و دوام سازه‌های بتنی می‌شود. کیفیت و نحوه تهیه خاکستر پوسته برنج بر خواص نهایی بتن تهیه شده از آن تاثیرگذار است. در این مقاله خاکستر پوسته برنج در شرایط دمایی کنترل‌شده، نیمه کنترل‌شده و کنترل نشده سوزانده شده و خاکستر حاصل به میزان 10 درصد جایگزین سیمان در بتن خود تراکم شده است. خواص کارایی و مقاومت فشاری نمونه‌های حاوی خاکستر پوسته برنج در سنین مختلف ارزیابی شده است. خواص مربوط به پودر خاکستر پوسته برنج از طریق آزمایش‌های XRF، FESEM و محدوده اندازه دانه‌ها تعیین شده است. نتایج نشان داد که در همه حالت‌ها حاصل جمع SiO2، Al2O3 و Fe2O3 بالاتر از 70 % است؛ که نشان دهنده قرار گرفتن در محدوده‌ی استاندارد مواد سیمانی پوزولانی است. در حالت نیمه کنترل‌شده، سیلیس آمورف بیش از 8% و در حالت کنترل نشده بیش از 15% از حالت کنترل‌شده کمتر است. بر اساس نتایج، تغییر نوع خاکستر تأثیر چندانی بر خواص بتن تازه نشان نمی‌دهد. اضافه کردن خاکستر پوسته برنج موجب افزایش مقاومت فشاری 90 روزه و کاهش در مقاومت فشاری کوتاه مدت بتن خود تراکم شده است. افزایش مقاومت بلند برای نمونه‌های با خاکستر تولید شده در شرایط کنترل شده بیشتر و تا میزان 18 درصد بوده است. کاهش مقاومت فشاری کوتاه مدت برای نمونه‌های با خاکستر کنترل نشده بیشتر و تا 25 درصد بدست آمده است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Workability and compressive strength of self-compacting concrete containing rice husk ash from controlled and uncontrolled burning condition

نویسندگان [English]

  • sasan motaghed 1
  • ali rastegar 2
  • Seyed Abbas Hosseini 3
1 Assistant Prof., Civil Engineering, Faculty of Engineering, Behbahan Khatam Alanbia University of Technology, Behbahan, Iran.
2 Department of Engineering, Behbahan Khatam Alanbia University of Technology, Behbahan, Iran
3 Assistant Professor in Structural Engineering, Faculty of Technology and Mining, Yasouj University, Choram, Iran .
چکیده [English]

Rice husk as an agricultural waste material has a large amount of amorphous silica, adding its ash to concrete increases the pozzolanic property of concrete and consequently increases the strength and durability of reinforced concrete structures. The quality and method of rice husk ash preparation greatly influence the final properties of the concrete prepared from it. In this article, rice husk ash has been burned in controlled, semi-controlled, and uncontrolled conditions in terms of temperature conditions, and the resulting ash has been used as a 10% substitute for cement in self-compacting concrete. Properties related to concrete performance and compressive strength of samples containing rice husk ash at different ages have been evaluated. The properties of rice husk ash powder have been determined through XRF, FESEM, and the determination of grain size range. The results show that in all cases the sum of SiO2, Al2O3 and Fe2O3 is higher than 70%; which indicates being within the standard range of pozzolanic cement materials. In the semi-controlled state, the amorphous silica is more than 8%. Based on the results, adding rice husk ash increases the long-term compressive strength (90 days) and decreases the short-term compressive strength of self-compacting concrete. The increase in long-term strength for samples with ash produced in controlled conditions was more and up to 18%. The reduction of short-term compressive strength for samples with uncontrolled ash has been obtained up to 25%.

کلیدواژه‌ها [English]

  • Rice husk ash
  • workability
  • self-compacting concrete
  • compressive strength
  • particle size distribution

مراجع

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