تأثیر تئوس و سرباره بر خودترمیمی بتن فوق توانمند الیافی با تمرکز بر بازیابی خصوصیات مکانیکی
محورهای موضوعی : آنالیز سازه - زلزله
سید مهدی طاهریان قهفرخی
1
,
محمد محمدی ده چشمه
2
,
حسین تاجمیر ریاحی
3
,
غلامرضا قدرتی امیری
4
1 - دانشجوی دکتری، گروه مهندسی عمران، واحد شهرکرد، دانشگاه آزاد اسلامی، شهرکرد، ایران
2 - استادیار گروه مهندسی عمران، واحد شهرکرد، دانشگاه آزاد اسلامی، شهرکرد، ایران
3 - گروه مهندسی عمران، دانشکده عمران، دانشگاه اصفهان، اصفهان، ایران
4 - استاد دانشگاه علم و صنعت ایران
کلید واژه: خودترمیمی, بتن فوق¬توانمند, تئوس, سرباره فولاد و خصوصیات مکانیکی,
چکیده مقاله :
در این تحقیق بر تأثیر مواجهه مستقیم تترا اتیل ارتوسیلیکات و جایگزینی بخشی از سیمان با سرباره کوره ذوب‌آهن بر عملکرد خودترمیمی بتن فوق توانمند الیافی با تمرکز بر بازیابی مقاومت خمشی و فشاری پرداخته شده است. برای این منظور، بر روی نمونه‌های ساخته‌شده، در سن سه روز، ریزترک‌هایی به عرض حدود 150 میکرون ایجاد گردید. دو طرح اختلاط با دو نوع شرایط مواجهه مورد بررسی قرار گرفت: در دسته اول، نمونه‌ها پس از ایجاد ریزترک به مدت 90 روز در آب با دمای محیط قرار گرفتند و در دسته دوم، تنها وجه ترک‌دار در معرض تئوس و سایر وجوه به مدت 90 روز در تماس با آب بودند. یکی از طرح‌ها شامل 15 درصد سرباره کوره ذوب‌آهن به‌جای سیمان بود و دیگری فاقد سرباره بود. نمونه‌های ترمیم‌شده با پردازش تصاویر میکروسکوپ نوری دیجیتال، بازیابی خصوصیات مکانیکی (مقاومت فشاری و خمشی) و تعیین میکروساختار با میکروسکوپ الکترونی روبشی مجهز به آنالایزر EDS ارزیابی شدند. نتایج نشان می‌دهد که نمونه‌های ترمیم‌شده که با سرباره کوره ذوب‌آهن ساخته و در مواجهه با تئوس قرار گرفتند به بهترین نتایج از نظر بسته‌شدن ترک‌ها و بازیابی مقاومت فشاری و خمشی منجر شده‌اند. همچنین تحلیل EDS برای این نمونه‌ها نشان می‌دهد که نسبت Ca/Si در محصولات ترمیمی داخل ترک به کمتر از 1 کاهش‌یافته که می‌تواند از دلایل بهتر بسته‌شدن ترک‌ها و بهبود مشخصات مکانیکی باشد.
This study investigates the impact of tetraethyl orthosilicate (TEOS) and the partial replacement of cement with ground granulated blast-furnace slag (GGBFS) on the self-healing properties of ultra-high-performance fiber-reinforced concrete (UHPFRC), with a particular focus on the recovery of mechanical properties, including flexural and compressive strength. Microcracks, approximately 150 microns in width, were induced in UHPFRC samples at three days of age. Two mix designs were tested under different exposure conditions: one group of samples was immersed in water at ambient temperature for 90 days after microcrack formation, while the other group was exposed to TEOS on the cracked surfaces, with the remaining surfaces kept in contact with water for the same duration. The mix designs included one with 15% GGBFS replacing cement and another without GGBFS.The healed samples were evaluated using digital optical microscopy, mechanical property recovery tests (compressive and flexural strength), and microstructural analysis via scanning electron microscopy (SEM) equipped with an energy-dispersive X-ray spectroscopy (EDS) analyzer. The results demonstrated that samples containing GGBFS and exposed to TEOS exhibited superior crack closure and recovery of mechanical properties. Furthermore, EDS analysis revealed that the Ca/Si ratio in the healing products within the cracks decreased to less than 1, which likely contributed to enhanced crack sealing and improved mechanical performance.
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