مصالح و سازه های بتنی

مصالح و سازه های بتنی

ارزیابی مشخصات مکانیکی و حرارتی بتن‌های خودتراکم قلیافعال و سیمانی

نوع مقاله : مقاله پژوهشی

نویسندگان
شهریار عبداله زاده 1
محمود نیلی 2
نیکتا لقمانی 3
1 دانش آموخته دکتری مهندسی عمران، گروه مهندسی عمران، دانشکده فنی مهندسی، دانشگاه بوعلی سینا، ایران
2 دانشیار، گروه مهندسی عمران، دانشکده فنی مهندسی، دانشگاه بوعلی سینا، ایران
3 دانشجوی دکتری، گروه مهندسی عمران، دانشکده فنی مهندسی، دانشگاه بوعلی سینا، ایران
10.30478/jcsm.2024.433445.1355
چکیده
امروزه بهره‌گیری از بتن‌های نوین مانند بتن‌های خودتراکم و به‌کارگیری مصالح جدید مانند سرباره و خاکستربادی فعال‌شده، به‌منظور حفظ محیط‌زیست و توسعه پایدار در اجرای زیرساخت‌های بتنی ضروری به نظر می‌رسد. در پژوهش حاضر از چسباننده سرباره و خاکستربادی قلیافعال به منظور ساخت بتن‌های خودتراکم بهره گرفته شده است. در سه عیار مواد چسباننده 500، 600 و 700 کیلوگرم در متر مکعب و نسبت ثابت آب به مواد چسباننده برابر با 45/0، مشخصات مکانیکی و رفتار حرارتی با گرماسنج نیمه‌آدیاباتیک در بتن‌های خودتراکم قلیافعال و سیمانی ارزیابی گردیده‌‌اند. از محلول حاوی سدیم هیدروکسید و سدیم سیلیکات با 5، 6 و7 درصد یون سدیم و مدول سیلیسی (SiO₂/Na₂O) برابر با یک برای فعال‌سازی سرباره و خاکستربادی استفاده گردیده است. نتایج حاکی از آن است که کارایی بتن‌های خودتراکم تازه با تغییر چسباننده سیمانی به قلیافعال در محدوده مجاز EFNARC بوده است. حداکثر مقاومت‌های فشاری و کششی و مدول ارتجاعی در طرح‌های حاوی 700 کیلوگرم بر مترمکعب مواد چسباننده و در طرح‌های قلیافعال بافعال‌ساز حاوی 7 درصد یون سدیم حاصل شده است. پایش رژیم حرارتی نشان داده است که حداکثر دمای هیدراته‌شدن و میزان حرارت تولیدی طرح‌های سیمانی نسبت به طرح‌های قلیافعال به ترتیب 14 و 56 درصد بیشتر است.
کلیدواژه‌ها
بتن خودتراکم قلیافعال
مدول ارتجاعی
رفتار حرارتی
سرباره
خاکستربادی

موضوعات

عنوان مقاله English

Evaluation of Mechanical and Thermal Characteristics of Self-Compacting Alkali Activated and Cementitious Concrete

نویسندگان English

shahriar abdolahzade 1
Mahmoud Nili 2
nikta loghmani 3
1 PhD of Civil Engineering, Department of Civil Engineering, Bu-Ali Sina University, Hamedan, Iran
2 Associate Professor, Department of Civil Engineering, Bu-Ali Sina University, Hamedan, Iran
3 PhD Candidate, Department of Civil Engineering, Bu-Ali Sina University, Hamedan, Iran
چکیده English

The development of novel concretes, such as self-compacting concrete, and employing new materials, including alkali activated slag and fly ash, seem necessary for environmental protection and sustainable development in infrastructure. In this study, alkali activated slag and fly ash are employed as an alternative eco-friendly binder to produce self-compacting concrete. Mechanical and thermal properties (using a semi-adiabatic calorimeter) of alkali activated- and cementitious-self compacting concretes with three binder contents (500–600–700 kg/m³) were compared. All mixes had a water-to-binder ratio of 0.45. The alkaline solutions used consist of sodium hydroxide and sodium silicate solutions with 5, 6, and 7% Na ions and a constant activator modulus (ratio of SiO₂/Na₂O) of one. The finding demonstrated that the workability of fresh self-compacting concrete with different binder content satisfied the EFNARC limitation. Mixes with 700 kg/m³ binder content had the highest compressive and tensile strength and modulus of elasticity. Generally, the peak temperature and heat production of cementitious mixes were 14% and 56% more than those of alkali-activated mixes, respectively.

کلیدواژه‌ها English

Self-Compacting Alkali Activated Concrete
Modulus of Elasticity
Thermal Behavior
Slag
Fly Ash
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  • تاریخ دریافت 12 دی 1402
  • تاریخ بازنگری 21 فروردین 1403
  • تاریخ پذیرش 06 خرداد 1403