Performance Assessment of Hybrid Polypropylene Fiber-Reinforced Concrete for Rigid Pavement Structures

Öz

This study was conducted to investigate the effects of fiber reinforcement on the mechanical strength and energy absorption capacity of concrete under varying watert/cement(w/c) ratios and aggregate gradations, using commercially available sikafiber and polimono fibers. Using the Taguchi method, four levels of w/c ratio, fiber content and gradation were optimized. When only sikafiber was used, compressive strength increased by 4% and flexural strength by 9.2%. With polimono fiber, increases of 3.3% and 7.3% were observed, respectively. The combined use of both fibers resulted in a 7.5% increase in compressive strength and a 43% increase in flexural strength. Increasing fiber content improved the energy absorption capacity by 173.957%. Fiber addition reduced the brittleness of concrete and enhanced its ductility, thereby improving structural performance. These findings indicate that fiber-reinforced concretes are an effective option for structural applications requiring enhanced strength and durability.

Anahtar Kelimeler

• Compressive strength
• Tensile strength
• Taguchi method
• Toughness
• Polypropylene fiber concrete

Hibrit Polipropilen Lif Donatılı Betonun Rijit Kaplama Yapılarında Performans Değerlendirmesi

Öz

Bu çalışma, ticari olarak temin edilen sikafiber ve polimono liflerin kullanımıyla, lif katkısının farklı su/çimento (s/c) oranları ve agrega gradasyonları altındaki betonun mekanik dayanımı ile enerji yutma kapasitesi üzerindeki etkilerini incelemek amacıyla gerçekleştirilmiştir. Taguchi yöntemi ile dört farklı (s/c) oranı, lif oranı ve gradasyon seviyesi kullanılarak optimize edilmiştir. Sadece sikafiber lifi kullanıldığında basınç dayanımı %4, eğilme dayanımı %9.2 artmıştır. Polimono lifi ile basınç ve eğilme dayanımında sırasıyla %3.3 ve %7.3 artış sağlanmıştır. Her iki lifin birlikte kullanımı basınç dayanımını %7.5, eğilme dayanımını %43 oranında artırmıştır. Lif oranının artması enerji yutma kapasitesini %173.957 iyileştirmiştir. Lif katkısı, betonun kırılganlığını (rijitliğini) azaltıp sünekliğini artırarak yapısal performansını güçlendirmiştir. Bu sonuçlar, lif takviyeli betonların dayanım ve dayanıklılık gerektiren yapısal uygulamalarda etkin bir seçenek olduğunu göstermiştir.

Anahtar Kelimeler

• Basınç Dayanımı
• Çekme Dayanımı
• Lifli Beton
• Taguchi Metodu
• Tokluk

Kaynakça

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