بررسی مقاومت فشاری بتن با ماده افزودنی میکروسیلیس تحت مدت زمان‌های مختلف از عمل‌آوری تسریع‌یافته با بخار

نوع مقاله : علمی - پژوهشی

نویسندگان

1 استادیار، دانشکده فنی و مهندسی، دانشگاه شهید مدنی آذربایجان، تبریز، ایران

2 دانش آموخته کارشناسی، دانشکده فنی و مهندسی، دانشگاه شهید مدنی آذربایجان، تبریز،ایران

3 دانش آموخته کارشناسی، دانشکده فنی و مهندسی، دانشگاه شهید مدنی آذربایجان، تبریز، ایران

چکیده

هدف از این تحقیق انجام یک مطالعه آزمایشگاهی جهت بررسی تأثیر استفاده از ماده افزودنی میکروسیلیس در مقاومت فشاری بتن تحت مدت زمان‌های مختلف از عمل‌آوری تسریع‌یافته با بخار می‌باشد. بدین منظور چهار طرح اختلاط که در دو طرح از ماده افزودنی میکروسیلیس به مقدار 10% و 15% وزنی سیمان استفاده شده، در نظر گرفته شده‌اند. 48 نمونه مکعبی تحت عمل‌آوری با روش غوطه‌وری در آب قرار گرفته و در سنین 3، 7، 14 و 28 روزه مقاومت فشاری آنها سنجیده شده است. همچنین 84 نمونه مکعبی تحت عمل‌آوری تسریع‌یافته با بخار تحت حداکثر دمای ºC 2±66 قرار گرفته و مقاومت فشاری آنها با 4، 8، 16، 24، 32، 40 و 48 ساعت عمل‌آوری اندازه‌گیری شده است. نتایج تحقیق نشان می‌دهد که با اضافه کردن میکروسیلیس به بتن مقاومت فشاری نهایی در هر دو نوع عمل‌آوری افزایش می‌یابد. محاسبه نسبت مقاومت نمونه‌ها تحت عمل‌آوری با بخار بر مقدار متناظر در عمل‌آوری با آب نشان می‌دهد که طرح‌های دارای میکروسیلیس عملکرد ضعیف‌تری نسبت به طرح‌های بدون میکروسیلیس از نظر نرخ رشد مقاومت فشاری دارند. همچنین نتایج نشان می‌دهند که با کاهش نسبت آب به سیمان، گیرش مقاومت بتن در عمل‌آوری با بخار سریع‌تر رخ می‌دهد. در نهایت پیشنهاد می‌شود در صورت استفاده از پودر میکروسیلیس در بتن به عنوان ماده افزودنی، برای تأمین 70% از مقدار مقاومت 28 روزه بتن که برای ساخت بتن‌های پیش‌ساخته و پیش‌تنیده لازم است، از پودر میکروسیلیس به مقدار 15% وزنی سیمان استفاده شده و بتن تحت 24 ساعت عمل‌آوری با بخار قرار گیرد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigation on the Compressive Strength of Concrete with Microsilica Additive under Different Durations of Accelerated Steam Curing

نویسندگان [English]

  • Mohammadreza Seify Asghshahr 1
  • Pouya Sadigh Dalali 2
  • Ata Talebzadeh 3
1 Assistant Professor, Faculty of Technology and Engineering, Azarbaijan Shahid Madani University, Tabriz,, Iran
2 BSc, Faculty of Technical and Engineering. Azarbaijan Shahid Madani University. Tabriz. Iran
3 BSc, Faculty of Technology and Engineering, Azarbaijan Shahid Madani University, Tabriz, Iran
چکیده [English]

The purpose of this research is to conduct a laboratory study to investigate the effect of using microsilica additive on the compressive strength of concrete under different durations of accelerated steam curing. For this aim, four mix designs have been considered, in which in two of them microsilica additive is used in the amount of 10% and 15% by weight of cement. 48 cubic samples were cured by immersion in water and their compressive strength was measured at the ages of 3, 7, 14, and 28 days. Also, 84 cubic samples were subjected to accelerated steam curing under the maximum temperature of 66±2 ºC and their compressive strength was measured after 4, 8, 16, 24, 32, 40, and 48 hours of treatment. The research results show that by adding microsilica to concrete, the ultimate compressive strength increases in both types of curing. Calculating the ratio of the strength of the samples under steam curing to the corresponding value in water curing indicates that the designs with microsilica have weaker performance than the designs without microsilica in terms of gain rate in compressive strength. Also, the results show that with the reduction of the water-cement ratio, concrete strength setting in steam curing occurs faster. Finally, it is suggested that if microsilica powder is used in concrete as an additive, in order to provide 70% of the 28-day strength of concrete, which is necessary for producing prefabricated and prestressed concrete, microsilica powder must be used in the amount of 15% by weight of cement and concrete must be subjected to steam treatment for 24 hours.

کلیدواژه‌ها [English]

  • Concrete
  • Compressive Strength
  • Steam Curing
  • Additive
  • Microsilica

مراجع

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  • تاریخ دریافت: 23 آبان 1401
  • تاریخ بازنگری: 20 بهمن 1401
  • تاریخ پذیرش: 20 اسفند 1401

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