Impact of TEOS and GGBFS on the Self-Healing Properties of Ultra-High Performance Fiber-Reinforced Concrete (UHPFRC): A Focus on Mechanical Recovery
Subject Areas : Analysis of Structure and Earthquake
Sayed Mehdi Taherian Ghahfarokhi
1
,
mohamad mohamadi dehcheshmeh
2
,
حسین تاجمیر ریاحی
3
,
غلامرضا قدرتی امیری
4
1 - . Ph.D. Candidate, Department of Civil Engineering, Shahrekord Branch, Islamic Azad University, Shahrekord, Iran
2 -
3 - گروه مهندسی عمران، دانشکده عمران، دانشگاه اصفهان، اصفهان، ایران
4 - استاد دانشگاه علم و صنعت ایران
Keywords: Self-healing, UHPFRC, TEOS, GGBFS, Mechanical Characteristic,
Abstract :
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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