Abstract    The performances of cementitious materials as well as the efficiency of construction are adversely affected at high temperatures. Previous studies have already demonstrated that ultra-fine (alccofine) material accelerates the hydration of cement particles and subsequently improves the mechanical and durability properties of the concrete at normal temperature. Moreover, at higher temperatures the performance of the concrete with the addition of alccofine is still unknown. This paper presents the effect of analytical properties of concrete with alccofine (25%) as a replacement of cement for various W/B ratios (i.e. 0.38, 0.4 and 0.45). The effect of addition of alccofine dosage on the thermogravimetric analysis was carried out in which not only mass loss and decomposition of hydration products from concrete with respect to temperature was found but also bound water (%) and calcium hydroxide (%) present in the concrete were determined. From X-ray diffraction it was observed that alccofine improved the formation of calcium silicate hydrate and calcium silicate aluminum hydrate in concrete and scanning electron microscope (SEM) analysis showed the formation of ettringite needles and calcium silicate hydrate in voids which made concrete denser. Therefore, it was concluded from this study that alccofine can be used as a viable substitute to cement in normal concrete considering its positive effects on property enhancement and an eco-friendly product.

Keywords    Thermogravimetric Analysis; X-ray diffraction; Scanning Electron Microscope

چکیده    عملکرد مواد سیمان و همچنین بهره وری ساخت و ساز در دمای بالا تحت تاثیر قرار می گیرند. مطالعات قبلی قبلا نشان داده است که مواد فوق سنگین (آلکوفین) باعث سرعت بخشیدن به هیدراتاسیون ذرات سیمان و سپس بهبود خواص مکانیکی و دوام بتن در دمای طبیعی می شوند. علاوه بر این، در دماهای بالاتر عملکرد بتن با اضافه کردن آلکوفین هنوز ناشناخته است. این مقاله تاثیر خواص تحلیلی بتن را با آلکوفین (25٪) به عنوان جایگزینی سیمان برای نسبت های مختلف W / B (یعنی 0.38، 0.4 و 0.45) ارائه می دهد. اثر افزودن آلکوفین دوز بر روی تجزیه و تحلیل گرماسنجی انجام گردیده که در آن نه تنها از دست دادن و تجزیه محصولات هیدراتاسیون از بتن با توجه به درجه حرارت یافت شد، بلکه همچنین آب متصل (٪) و هیدروکسید کلسیم (٪) موجود در بتن تعیین گردید. از پراش اشعه ایکس مشاهده شد که آلکوفین تشکیل هیدرات کلسیم سیلیکات هیدرات و هیدرات آلومینیوم سیلیکات کلسیم را در بتن و تجزیه و تحلیل میکروسکوپ الکترونی اسکن (SEM) نشان داد که تشکیل هیدراتهای اترینگیت و هیدرات سیلیکات کلسیم در حفره هایی که بتن را تسریع می کنند. بنابراین، از این مطالعه نتیجه گرفته شده است که آلکوفین را می توان به عنوان یک جایگزین مناسب برای سیمان در بتن معمولی با توجه به اثرات مثبت آن در بهبود ارتقاء سیمان و یک محصول سازگار با محیط زیست مورد استفاده قرار مي گيرد.

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