ارزیابی مشخصات حالت تازه بتن های فراتوانمند حاوی مواد زودگیرکننده، زئولیت و سرباره و تأثیر آنها بر مشخصات مکانیکی و دوام بلندمدت

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی عمران، دانشکده فنی، دانشگاه گیلان

2 استادیار گروه عمران، دانشکده فنی، دانشگاه 'گیلان

10.22124/jcr.2026.25044.1624

چکیده

پتانسیل بالای بتن‌های فراتوانمند (UHPC) به دلیل مقاومت اولیه زیاد، آن را برای کاربردهایی همچون تعمیرات سریع رویه‌های بتنی و ساخت قطعات پیش‌ساخته مناسب ساخته است. استفاده از پوزولان‌های صنعتی بومی نظیر سرباره و زئولیت می‌تواند ضمن کاهش مصرف سیمان، موجب بهبود دوام و عملکرد بلندمدت این بتن‌ها گردد. در این پژوهش، به منظور بررسی رفتار UHPC در شرایط مناسب برای تعمیرات سریع در نواحی سردسیر، پس از بهینه‌سازی مقدار زودگیرکننده، ده طرح اختلاط با درصدهای 5، 10 و 15 جایگزینی دوده سیلیسی با سرباره و زئولیت به‌صورت منفرد و ترکیبی مورد آزمایش قرار گرفت. آزمون‌های حالت تازه شامل تغییرات دمای درونی و زمان گیرش، و در حالت سخت‌شده شامل مقاومت فشاری، مقاومت الکتریکی و جذب آب نهایی در سنین مختلف انجام شد. نتایج نشان داد که هر دو پوزولان با کنترل سرعت گیرش و کاهش گرمای هیدراسیون، به بهبود رفتار بتن در حالت تازه کمک کردند. در سن 28 روزه، طرح‌های حاوی 5٪ جایگزینی سرباره و زئولیت به ترتیب موجب افزایش 6 تا 9 درصدی مقاومت فشاری و بیش از 10 درصدی مقاومت الکتریکی نسبت به طرح شاهد شدند. با افزایش جایگزینی به 15٪، افت 8 تا 12 درصدی در مقاومت و دوام مشاهده گردید. همچنین همبستگی معناداری میان نتایج آزمون‌های مکانیکی و دوام در سنین مختلف به‌دست آمد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Evaluation of the characteristics of the fresh state of ultra-high performance concrete containing accelerating agent, zeolite and slag and their effect on the mechanical characteristics and long-term durability

نویسندگان [English]

  • Bijan Bijan 1
  • Atollah Hajati Modaraei 2
1 civil engineering faculty, engineering campus, guilan university
2 Assistant professor, civil engineering faculty, guilan university
چکیده [English]

The high potential of ultra-high-performance concrete (UHPC) due to its early-age strength makes it suitable for applications such as rapid repairs of concrete pavements and the production of precast elements. The use of local industrial pozzolans, such as slag and zeolite, can reduce cement consumption while improving the long-term performance and durability of these concretes. In this study, to evaluate the behavior of UHPC under conditions suitable for rapid repairs in cold regions, ten mix designs were tested after optimizing the amount of accelerator, with 5%, 10%, and 15% replacement of silica fume by slag and zeolite, applied individually and in combination. Fresh-state tests included internal temperature variations and setting time, while hardened-state tests included compressive strength, electrical resistivity, and water absorption at different ages. The results showed that both pozzolans improved the fresh-state behavior by controlling setting rate and reducing hydration heat. At 28 days, mixes containing 5% replacement of slag and zeolite increased compressive strength by 6–9% and electrical resistivity by over 10% compared to the reference mix. Increasing the replacement to 15% resulted in an 8–12% reduction in strength and durability. Moreover, significant correlations were observed between mechanical properties and durability tests across different ages.

کلیدواژه‌ها [English]

  • Ultra-high performance concrete
  • Zeolite
  • Blast furnace slag
  • Electrical resistivity changes
  • internal temperature changes
  • setting time
  • early setting

مراجع

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