بررسی اثر دمای بالای عمل‌آوری بر مقاومت فشاری و زمان گیرش ملات و خمیر قلیا فعال سرباره‌ای آمیخته با میکروسیلیس

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری دانشگاه آزاد اراک

2 عضو هیئت علمی دانشگاه بوعلی سینا

3 استادیار گروه عمران دانشگاه آزاد اراک

4 دانشکده مهندسی عمران، واحد اراک، دانشگاه آزاد اسلامی، اراک، ایران

چکیده

سرباره‌ قلیا فعال به عنوان جایگزین سیمان پرتلند در بتن یا ملات، ضمن برتری به لحاظ برخی خواص، مانند مقاومت مکانیکی و دوام، مشکلاتی نظیر سرعت گیرش بالا و انقباض زیاد را نیز به همراه داشته است. در این پژوهش، تغییرات مدت زمان گیرش خمیر و مقاومت فشاری ملات در اثر جایگزینی میکروسیلیس به میزان صفر، پنج و ده درصد و عمل‌آوری در دماهای ˚C2±23، 40، 60 و 80 مورد مطالعه قرار گرفت. بیشترین مقاومت فشاری، با پنج درصد جایگزینی میکروسیلیس و دمای عمل‌آوری ˚C80 حاصل شد و طرح مربوط به جایگزینی ده درصد میکروسیلیس و دمای عمل‌آوری ˚C2±23 طولانی‌ترین زمان گیرش را به دنبال داشت. در مجموع، با ملاحظه‌ هر دو پارامتر مقاومت فشاری و مدت زمان گیرش و همچنین صرفه‌‌جویی اقتصادی و مصرف انرژی کمتر، می‌توان طرح مربوط به جایگزینی پنج درصد میکروسیلیس و عمل‌آوری در دمای ˚C40 را به عنوان طرح بهینه معرفی نمود. ضمناً جهت صحت سنجی نتایج، از تصاویر میکروسکوپ الکترونی روبشی استفاده شد.

کلیدواژه‌ها

عنوان مقاله [English]

Assessment of elevated temperature curing on compressive strength and setting time of alkali activated slag mortar and paste, associated with silica fume

نویسندگان [English]

  • Naser Sameti 1
  • Ebrahim Ghiasvand 2
  • Ehsanollah Zeighami 3
  • Seyed Mohammad Hoseini 4
1 Department of civil Engineering, Arak Branch, Islamin Azad University, Arak, Iran
2 Buali Sina University
3 Department of civil Engineering, Arak Branch, Islamin Azad University, Arak, Iran
4 Department of Civil Engineering. Arak Branch Islamic. Azad University. Arak. Iran
چکیده [English]

Use alkali activated slag as a replacement of OPC, in spite of preference for purpose of some properties, like mechanical strength and durability of concrete or mortar against aggressive environmental conditions, has some problems like short setting time, high contraction and inconstant chemical composition. To improve the setting time and compressive strength of alkali activated slag (AAS) based paste and mortar, this research carried out to investigate the synergic effect of using Silica Fume (SF) and elevated temperature on setting time and compressive strength of AAS paste and mortar by substitution of SF at 0 ‌w%, 5w% and 10w% of slag and elevated temperature curing at 40˚C, 60˚C and 80˚C. Combination of sodium silicate and sodium hydroxide was applied for activation of slag. The concentration of sodium hydroxide solution was 4M and the ratio of sodium hydroxide to sodium silicate was 3 and the ratio of alkaline solution to slag was 0.45. Curing temperature at 80˚C had the highest compressive strength, and the lowest setting time among the made mortars and pastes. On the other hand, 5w% replacement of silica fume, was the best choice for compressive strength aspect, and 10w% replacement represented the longest setting time. In terms of the synergic effect of substitution of slag with silica fume and heat treatment, with desirability of longer setting time, the substitution of 5w% silica fume, conjoint with 40˚C heat curing, yielded the optimum results. The obtained resultants, was verified by means of Scanning Electron Microscope (SEM) pictures.

کلیدواژه‌ها [English]

  • Alkali activated slag
  • elevated temperature curing
  • silica fume

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