مصالح و سازه های بتنی

مصالح و سازه های بتنی

بررسی آزمایشگاهی تأثیر جایگزینی جزئی سیمان با فروفسفر بر زمان گیرش خمیر سیمانی

نوع مقاله : یادداشت فنی

نویسندگان
1 کارشناسی ارشد مهندسی عمران، دانشگاه بین‌المللی اهل‌بیت (ع)، تهران، ایران.
2 استادیار، گروه مهندسی عمران، دانشگاه بین المللی اهل بیت (ع)، تهران، ایران
3 استادیار دانشکده فنی و مهندسی، دانشگاه بین‌المللی اهل‌بیت (ع)، تهران، ایران.
4 استادیار، گروه مهندسی عمران، دانشگاه آزاد اسلامی واحد تهران جنوب
چکیده
فروفسفر به‌عنوان یکی از محصولات جانبی صنایع فولاد، به دلیل دارا بودن ترکیبات معدنی فعال می‌تواند در بهبود یا تغییر رفتار هیدراتاسیون سیمان نقش مؤثری ایفا کند. این پژوهش با هدف بررسی تأثیر مقادیر مختلف فروفسفر بر زمان‌گیرش ملات سیمانی انجام شده است. برای این منظور، نمونه‌های سیمان تیپ II با درصدهای جایگزینی (۰، ۵، ۱۰، ۱۵ و ۲۰) درصد فروفسفر تهیه و با استفاده از دستگاه ویکات تحت شرایط استاندارد ASTM C191 مورد آزمایش قرار گرفتند. نتایج نشان داد که با افزایش میزان فروفسفر، زمان‌گیرش اولیه و نهایی ملات سیمانی افزایش یافته؛ به‌طوری که زمان‌گیرش اولیه از ۱۶۵ دقیقه در نمونه شاهد به 5/197 دقیقه در نمونه حاوی ۲۰ درصد فروفسفر رسید. همچنین زمان‌گیرش نهایی از ۲۲۲ دقیقه در نمونه شاهد به ۲۶۵ دقیقه در نمونه با بیشترین درصد جایگزینی افزایش پیدا کرده است. این تغییرات نشان داد که فروفسفر می‌تواند همانند یک افزودنی کُندگیر عمل کند و آغاز واکنش‌های هیدراتاسیون را به تأخیر اندازد. با این حال، استفاده بیش از حد این ماده ممکن است باعث ایجاد محدودیت‌هایی در کاربردهای عملی شود؛ چراکه تأخیر زیاد در گیرش می‌تواند بر فرایندهای اجرایی و دوام بتن اثر منفی بگذارد. در مجموع، یافته‌های این پژوهش بیانگر آن است که فروفسفر با نسبت‌های بهینه می‌تواند به‌عنوان یک افزودنی معدنی جایگزین مورد توجه قرار گیرد و ضمن کمک به مدیریت پسماندهای صنعتی، در کنترل فرآیند گیرش ملات سیمانی نیز نقش داشته باشد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Experimental Investigation of the Effect of Partial Replacement of Cement with Ferrophosphorus on the Setting Time of Cement Paste

نویسندگان English

Sakina Atayee 1
Payam Tarighi 2
Mehdi Shalchi Tousi 3
Ata Hojat Kashani 4
1 M.Sc. in Civil Engineering, Structural Engineering , Ahlul Bayt International University, Tehran, Iran.
2 Department of Civil Engineering, Faculty of Engineering, Ahlul Bayt International University, Tehran, Iran.
3 Assistant Professor, Faculty of Engineering and Technology, Ahlul Bayt International University, Tehran, Iran.
4 Assistant Professor, Department of Civil Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran.
چکیده English

Ferrophosphorus, as a by-product of the steel industry, contains reactive mineral compounds that can influence the hydration process of cement. This study aimed to evaluate the effect of various replacement levels of ferrophosphorus on the setting time of cement mortar. For this purpose, Type II Portland cement was partially replaced with ferrophosphorus at levels of 0%, 5%, 10%, 15%, and 20%. The initial and final setting times were measured using the Vicat apparatus in accordance with ASTM C191.The experimental results revealed that increasing the ferrophosphorus content led to a continuous delay in both the initial and final setting times. Specifically, the initial setting time increased from 165 minutes in the control sample to 197.5 minutes at 20% replacement, while the final setting time rose from 222 minutes to 265 minutes under the same condition. These findings indicate that ferrophosphorus acts as a retarding admixture, delaying both the onset and completion of cement hydration. However, excessive replacement levels may result in undesirable delays that could negatively affect construction schedules and the long-term performance of concrete. Overall, the results suggest that ferrophosphorus, when used in optimum replacement ratios, has potential to serve as a sustainable mineral admixture that not only contributes to industrial waste management but also provides effective control over the setting process of cementitious materials.

کلیدواژه‌ها English

Ferrophosphorus
Cement Mortar
Setting time
Vicat Needle
Portland Cement
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  • تاریخ دریافت 01 آبان 1404
  • تاریخ بازنگری 11 دی 1404
  • تاریخ پذیرش 25 بهمن 1404