مهندسی سازه و ساخت

مهندسی سازه و ساخت

تأثیر روش‌های اختلاط و عمل‌آوری بر خواص مکانیکی بتن سبک با سنگدانه‌های پرلیت

نوع مقاله : علمی - پژوهشی

نویسندگان
1 استادیار، دانشکده فنی مهندسی، دانشگاه صنعتی قم، قم، ایران
2 دانش آموخته کارشناسی مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه صنعتی قم، قم، ایران
چکیده
این مطالعه به بررسی تأثیر دو طرح اختلاط (استفاده از پرلیت خشک و پرلیت اشباع‌شده) و پنج روش عمل‌آوری (حوضچه آب، گونی مرطوب، گونی+نایلون، ماده عمل آورنده، و رهاسازی در محیط) بر مقاومت فشاری، خمشی و شکل‌پذیری بتن سبک حاوی سنگدانه‌های پرلیت پرداخته است. هدف اصلی، شناسایی روش‌های بهینه برای بهبود عملکرد بتن سبک در شرایط عملیاتی مختلف بود. در طرح اختلاط اول پرلیت خشک (بدون پیش‌مرطوب‌سازی) با اضافه کردن آب لازم جهت اشباع آن در هنگام اختلاط بتن و در طرح اختلاط دوم پرلیت اشباع‌شده (پیش‌مرطوب‌سازی ۲۴ ساعته) استفاده شد. نمونه‌ها در بازه‌های ۷، ۱۴ و ۲۸ روز تحت شرایط مختلف عمل‌آوری قرار گرفتند. مقاومت فشاری با جک ۲۰۰ تنی، مقاومت خمشی با جک ۶۰ تنی، و بررسی شکل‌پذیری با تحلیل نمودارهای تنش-کرنش انجام شد. طرح اختلاط دوم (پرلیت اشباع) مقاومت فشاری و مقاومت خمشی بالاتری نسبت به طرح اختلاط اول نشان داد. افزایش مقاومت ناشی از جذب آب کافی توسط پرلیت اشباع و هیدراتاسیون مؤثرتر سیمان بود. عمل آوری 7 روزه با گونی، بیش از 90% مقاومت ۲۸ روزه در شرایط عمل آوری استاندارد را تأمین کرد. عمل آوری با ماده عمل آورنده و رهاسازی در محیط کمترین مقاومت را ایجاد کردند. این پژوهش نشان می‌دهد که ترکیب مواد مناسب (پرلیت اشباع) و روش‌های عمل‌آوری بهینه (گونی یا گونی+نایلون) می‌تواند بدون نیاز به فرآیندهای پیچیده، به تولید بتن سبک با عملکرد مکانیکی مطلوب منجر شود.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

The Influence of Mixing and Curing Methods on the Mechanical Properties of Lightweight Concrete with Perlite Aggregates

نویسندگان English

Rooholah Bakhtiari Doost 1
Mohammadparsa Alizadeh 2
Mahdi Fattahi 2
1 Assistant Professor, Faculty of Engineering, Qom University of Technology, Qom, Iran
2 Graduate B.Sc. Civil Engineering, Faculty of Engineering, Qom University of Technology, Qom, Iran
چکیده English

This study investigated the influence of two mixing designs (using dry perlite vs. pre-saturated perlite) and five curing methods (water ponding, wet burlap, burlap + nylon sheet, curing compound, and air curing) on the compressive strength, flexural strength, and ductility of lightweight concrete containing perlite aggregates. The primary objective was to identify optimal methods for enhancing the performance of lightweight concrete under various operational conditions. In the first mix design, dry perlite (without pre-saturation) was added, with the necessary water for saturation added during concrete mixing, whereas in the second mix design, the perlite was pre-saturated for 24 hours prior to mixing. Compressive strength was tested using a 200-ton jack, flexural strength was tested with a 60-ton jack, and ductility was evaluated through stress-strain curve analysis. The second mixing design (saturated perlite) exhibited higher compressive and flexural strengths compared to the first design. This strength increase was attributed to adequate water absorption by the saturated perlite and more effective cement hydration. Curing with wet burlap for 7 days provided over 90% of the 28-day strength achieved under standard curing conditions. Curing with a curing compound and air curing yielded the lowest strengths. This research demonstrates that combining suitable materials (saturated perlite) with optimized curing methods (burlap or burlap + nylon) can produce lightweight concrete with desirable mechanical performance without the need for complex processes.

کلیدواژه‌ها English

Lightweight concrete
Perlite aggregates
Mixing design
Curing methods
Mechanical properties
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  • تاریخ دریافت 17 خرداد 1404
  • تاریخ بازنگری 22 شهریور 1404
  • تاریخ پذیرش 18 مهر 1404