بررسی اثر دمای عمل آوری بر دوام سولفاتی ملات قلیافعال سرباره ای حاوی دوده سیلیسی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری گروه عمران، واحد اراک، دانشگاه آزاد اسلامی، اراک، ایران.

2 استادیار گروه عمران، واحد اراک، دانشگاه آزاد اسلامی، اراک، ایران/استادیار گروه عمران، دانشگاه بوعلی سینا.

3 استادیار گروه عمران دانشگاه آزاد اراک

4 استادیار گروه عمران، واحد اراک، دانشگاه آزاد اسلامی، اراک، ایران.

10.22124/jcr.2021.20125.1507

چکیده

این مطالعه به منظور بهبود احتمالی عملکرد ملات قلیا فعال سرباره‌ای در مواجهه با محلول سدیم سولفات ترتیب داده شد. در این راستا دوده سیلیسی به عنوان جایگزین سرباره با سطوح جایگزینی 0، 5 و 10% به کار گرفته شد و نمونه‌ها در دماهای 2±23، 40، 60 و ℃80 عمل‌آوری شدند. به منظور پی‌بردن به رفتار نمونه‌ها از آزمایش-های نغییر طول وتغییر جرم و جهت شناسایی ریزساختار و محصولات تشکیل شده در خمیر سخت شده آنها، از آزمایش‌های تصویربرداری میکروسکوپ الکترونی روبشی و آنالیز پراش اشعه ایکس استفاده شد. نتایج حاصل حاکی از تاثیر مثبت عمل‌آوری حرارتی و جایگزینی دوده سیلیسی بر دوام ملات قلیا فعال سرباره‌ای بود. در این میان به‌کارگیری هم‌زمان جایگزینی دوده سیلیسی به میزان 5% و عمل‌آوری حرارتی با دمای ℃80 بهترین تاثیر را بر عملکرد ملات قلیا فعال سرباره‌ای به لحاظ مقاومت سولفاتی در برداشت. ملات قلیا فعال سرباره‌ای نسبت به ملات با پایه سیمان پرتلند از نظر مقاومت در برابر حمله سولفاتی از برتری چشمگیری برخوردار بود. نتایج آزمایش‌های تغییر طول و جرم برای مقایسه‌ی نمونه‌های ملات قلیا فعال سرباره‌ای کافی نبود؛ به نحوی که با افزودن نتایج آزمایش‌های تصویربرداری میکروسکوپ الکترونی روبشی و آنالیز پراش اشعه ایکس این امر میسر گردید.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Assessment the effect of curing temperature on sulfate resistance of alkali activated slag mortar containing silica fume

نویسندگان [English]

  • Naser Sameti 1
  • Ebrahim Ghiasvand 2
  • Ehsanollah Zeighami 3
  • Seyyed Mohammad Mirhosseini 4
1 Ph.D. student, Department of civil Engineering, Arak Branch, Islamic Azad University, Arak, Iran.
2 Buali Sina University
3 Department of civil Engineering, Arak Branch, Islamin Azad University, Arak, Iran
4 Assistant Professor, Department of civil Engineering Arak Branch, Islamic Azad University, Arak, Iran.
چکیده [English]

This study was conducted to probable improvement of the performance of alkali activated slag mortar exposed to sodium sulfate solution. In this regard, the joint effect of silica fume replacing at levels of 0, 5 and 10% and curing at 23 ± 2, 40, 60 and 80 °C on the durability of alkali activated slag mortar against high concentration sulfate medium was tested. In order to investigate the behavior of the samples, length change and mass change tests were used and to identify the microstructure and products formed in their hardened paste, scanning electron microscopy imaging and X-ray diffraction analysis were performed. The results showed the positive effect of heat treatment and silica fume replacement on the durability of alkali activated slag mortar. Simultaneous application of 5% silica fume replacement and heat treatment with a temperature of 80℃ had the best effect on the performance of activated alkaline slag mortar in terms of sulfate resistance. Alkali activated mortar was completely superior to ordinary Portland cement in terms of resistance to sulfate medium. The results of length and mass change experiments were not enough to compare alkali activated slag mortar samples. This was made possible by adding the results of scanning electron microscopy imaging test and X-ray diffraction analysis.

کلیدواژه‌ها [English]

  • Alkali-activated slag
  • Heat curing
  • Micro silica
  • Sulfate attack

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