بررسی مشخصات تازه، ریزساختاری و مکانیکی خمیر ژئوپلیمری حاوی سرباره کوره آهن گدازی و خاکستر برگ بامبو

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی عمران، دانشکدۀ فنی دانشگاه گیلان - رشت- ایران

2 عمران -سازه پردیس دانشگاه گیلان -رشت -ایران

10.22124/jcr.2023.23506.1607

چکیده

در این مقاله، اثر خاکستر برگ بامبو بر خصوصیات تازه، ریزساختاری و مکانیکی خمیر ژئوپلیمری بر پایه سرباره کوره آهن گدازی و خمیر ژئوپلیمری بر پایه سرباره کوره آهن گدازی/پودر زئولیت طبیعی مورد بررسی قرار گرفته است. علاوه بر این، اثر غلظت محلول هیدروکسید سدیم و نسبت محلول فعال کننده قلیایی به ماده پایه (Al/Bi) بر روی خصوصیات خمیر ژئوپلیمری بر پایه سرباره کوره آهن گدازی و خاکستر برگ بامبو بررسی شده است. بر اساس نتایج بدست آمده، جایگزینی 10 درصد از وزن مواد پایه با خاکستر برگ بامبو در خمیرهای ژئوپلیمری مورد مطالعه منجر به افزایش کارایی و زمان گیرش و همچنین کاهش مقدار فاز کریستالی تولید شده و در نتیجه کاهش مشخصات مکانیکی می شود. علاوه بر این نتایج نشان می دهد که افزایش غلظت محلول هیدروکسید سدیم از 8 به 16 مول در لیتر موجب کاهش کارایی، زمان گیرش و مشخصات مکانیکی خمیر ژئوپلیمری بر پایه سرباره کوره آهن گدازی و خاکستر برگ بامبو شده است. همچنین، در این نوع خمیر، افزایش نسبت Al/Bi از 5/0 به 7/0 موجب افزایش کارایی و زمان گیرش و کاهش مشخصات مکانیکی شده است. با توجه به نتایج بدست آمده، خاکستر برگ بامبو کارایی و زمان گیرش خمیرهای ژئوپلیمری بر پایه سرباره کوره آهن گدازی را افزایش می دهد اما با این حال، استفاده از آن باید تا مقدار معینی که موجب کاهش قابل توجه در مشخصات مکانیکی خمیر ژئوپلیمری نشود، محدود گردد

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Fresh, microstructural and mechanical properties of the GGBFS/bamboo leaf ash based geopolymer paste

نویسندگان [English]

  • A. Sadrmomtazi 1
  • Ebrahim Rashidi Fard 2
1 , Faculty of Engineering, Department of Civil Engineering, University of Guilan, Rasht, Iran
2 Civil Department-University of Guilan-University Campus 2-Rasht-IRAN
چکیده [English]

Abstract:

Ground Granulated Blast furnace slag (the GGBFS) is known as a potential by-product that can be used as a source of alumina-silicate in production of the geopolymers. The GGBFS based geopolymers possess disadvantages such as high shrinkage, low workability and short setting time. It has been proven that these defects can be reduced by partial replacement of the GGBFS by the other low calcium alumina-silicate materials. The bamboo leaf ash (BLA), which contains high content of SiO2 and low content of CaO, can be one of these materials. In this article, the effects of bamboo leaf ash on fresh, microstructural and mechanical properties of the GGBFS and the GGBFS/natural zeolite powder based geopolymer pastes have been investigated. Moreover, effect of the NaOH solution concentration( i.e. 8, 12 and 16 mole/liter) and the Al/Bi ratio (i.e. 0.5, 0.6 and 0.7) on properties of the geopolymer pastes have been evaluated. The results show that replacing 10% wt. of the base materials by the BLA in the studied geopolymer pastes leads to an increase in the workability and setting time. While, this substitution results a reduction in the amount of crystalline phases produced and consequently a decrease in the mechanical characteristics. Based on the results, as the NaOH solution concentration increases from 8 to 16 mole/liter, the workability, setting time and mechanical characteristics of the GGBFS/BLA based geopolymer paste have been reduced. Moreover,

کلیدواژه‌ها [English]

  • Bamboo Leaf Ash
  • GGBFS based Geopolymer Paste
  • Natural Zeolite Powder
  • Setting Time
  • Microstructural Properties
  • Mechanical Properties

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