مهندسی سازه و ساخت

مهندسی سازه و ساخت

بررسی رفتار و دوام یخ زدگی بتن با سیمان سفید و نسبت‌های مختلف وزنی کلسیم کربنات

نوع مقاله : علمی - پژوهشی

نویسندگان
1 کارشناس ارشد مهندسی سازه، دانشکده مهندسی عمران، دانشگاه آزاد اسلامی واحد سپیدان، سپیدان، ایران
2 استادیار، گروه مهندسی عمران، دانشگاه آزاد اسلامی واحد سپیدان، فارس، ایران
3 استادیار گروه مهندسی عمران، واحد فیروزاباد، مرکز میمند، دانشگاه آزاد اسلامی، میمند، ایران
چکیده
امروزه تولید بیش از حد سیمان در جوامع بشری بخصوص در ایران به یک بحران تبدیل شده. چرا که تولید سیمان مسبب نشر گاز دی اکسید کربن و تولید آلاینده در هوای شهرها خواهد شد که تبعات جبران ناپذیری دارد. استفاده از کربنات کلسیم در تولید بتن موجب بازیافت مقادیر زیادی از مواد و ضایعات و یک مزیت بزرگ است. کربنات کلسیم یک ماده بسیار پایدار است و یک ماده ساختمانی بادوام را ایجاد می‌کند. از این رو ایجاد دوام در پروژه‌های عمرانی و ساختمانی را می‌توان مهم‌ترین نقش کربنات کلسیم در بتن قلمداد کرد. در این تحقیق برای کاهش حجم مصرفی سیمان سفید جهت ساخت بتن از پودر کلسیم کربنات در نسبت‌های مختلف 5%، 10%، 15% و 20% وزنی سیمان استفاده گردید. آزمایشات انجام شده شامل اسلامپ، مقاومت فشاری، مقاومت کششی، جذب آب و بررسی دوام بتن در برابر چرخه ذوب و انجماد می‌باشد. نتایج این تحقیق نشان داد که استفاده از کلسیم کربنات بدلیل افزایش تولید هیدروکسید کلسیم در سیمان باعث افزایش مقاومت فشاری و کششی بتن خواهد شد. بطوریکه استفاده از 15% کلسیم کربنات باعث افزایش 20% مقاومت فشاری بتن خواهد شد. اما بدلیل افزایش جذب آب این ماده نیز دوام بتن در برابر جذب آب و دوام در برابر چرخه یخبندان کاهش می-یابد. استفاده از 20% کلسیم کربنات می‌تواند تا 7/11% دوام بتن را در برابر چرخه ذوب و انجماد کاهش دهد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

The Behavior and Durability of the Frost of White Concrete with Different Weights of Calcium Carbonate Oxide

نویسندگان English

ali mohamad sazegar 1
roozbeh aghamajidi 2
Babak Mansoori 3
1 Master's degree in Civil Engineering, Structural Engineering, Department of Civil Engineering, Islamic Azad University, Sepidan Branch, Sepidan, Iran
2 Assistant Professor, Department Of Civil Engineering, Islamic Azad University, Sepidan Branch, Fars, Iran.
3 Assistant Professor, Department of Civil Engineering, Firoozabad Branch, Meymand center, Islamic Azad University, Meymand, Iran
چکیده English

The use of mineral waste to produce new concrete is one of the important issues in the construction industry, which can have many environmental benefits and economic savings. Today, excessive production of cement has become a crisis in human societies, especially in iran. Because the production of cement will cause the release of carbon dioxide gas and the production of pollutants in the air of cities, which has irreparable consequences. On the other hand, the supply of electricity or gas energy for the fuel cycle of cement factories faces many challenges in some days of the year, which will cause a shortage of cement and an increase in the price of cement and, of course, an increase in the price of housing. In this research, calcium carbonate oxide powder was used in different weight ratios of 5%, 10%, 15% and 20% to reduce the amount of white cement used to make white concrete. The tests performed include slump, compressive strength, tensile strength, water absorption and checking the durability of concrete against the melting and freezing cycle. The results of this research showed that the use of calcium carbonate oxide will increase the compressive and tensile strength of concrete due to the increase in the production of calcium hydroxide in cement But using 15% calcium carbonate will increase the compressive strength of concrete by 20%. Due to the increased water absorption of calcium carbonate, the durability of concrete against frost decreases. The use of 20% calcium carbonate can reduce the durability of concrete by 11.7% against the cycle of melting and freezing.

کلیدواژه‌ها English

Calcium Carbonate Oxide
Freeze-Thaw Cycle
Green Concrete
White Cement
Compressive strength
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  • تاریخ دریافت 15 آذر 1402
  • تاریخ بازنگری 13 بهمن 1402
  • تاریخ پذیرش 24 اسفند 1402