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بررسی اثر دمای بالای عملآوری بر مقاومت فشاری و زمان گیرش ملات و خمیر قلیا فعال سربارهای آمیخته با میکروسیلیس | ||
تحقیقات بتن | ||
مقاله 9، دوره 13، شماره 4 - شماره پیاپی 32، دی 1399، صفحه 111-121 اصل مقاله (701.42 K) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22124/jcr.2020.16812.1443 | ||
نویسندگان | ||
ناصر صامتی1؛ ابراهیم قیاسوند* 2؛ احسان الله ضیغمی3؛ سید محمد میرحسینی4 | ||
1دانشجوی دکتری دانشگاه آزاد اراک | ||
2عضو هیئت علمی دانشگاه بوعلی سینا | ||
3استادیار گروه عمران دانشگاه آزاد اراک | ||
4دانشکده 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 | ||
سرباره قلیا فعال؛ عملآوری حرارتی؛ میکروسیلیس | ||
مراجع | ||
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