ATIK ÇELİK LİFLERLE GÜÇLENDİRİLMİŞ GEOPOLİMER BETONLARDA KARIŞIK MOD KIRILMASI

Year 2024, Volume: 27 Issue: 1, 232 - 242, 03.03.2024

Muhammed Gümüş , Hakan Bayrak

https://doi.org/10.17780/ksujes.1375088

Abstract

Yük deplasman eğrisinin uzun kuyruk kısmından dolayı, çelik lifli kompozitlerin eğilme davranışının değerlendirilmesinde dayanım kriteri tek başına doğru bir değerlendirme için yeterli değildir. Bu nedenle, lifli kompozitlerin kırılma karakterleri dünya genelinde giderek önem kazanmaktadır. Mevcut çalışmada, atık çelik liflerle güçlendirilmiş geopolimer betonların Mod-II kırılma performansı deneysel olarak incelenmiştir. Çalışmadaki temel parametreler çelik lif miktarı (kütlece %0 ve %2) ve çentik öteleme oranlarıdır (β = 0, 0.2 ve 0.4). Çok sayıda çentikli numuneler üretilmiş ve deformasyon kontrollü üç noktalı eğilme deneyi ile test edilmiştir. Eleman yüzeylerindeki deformasyon dağılımları dijital görüntü korelasyonu metodu ile hesaplanmıştır. Elde edilen sonuçlar ilk çatlama yükü, maksimum yük, kritik çatlak ağzı açılma deplasmanı, kritik çatlak ağzı kayma deplasmanı ve kırılma enerjisi açısından irdelenmiştir. Elde edilen deneysel sonuçlardan, kullanılan çelik liften dolayı maksimum eğilme yükünün 0, 0.2, ve 0.4 çentik öteleme oranlarında sırasıyla 666%, 1327%, ve 400% arttığı görülmüştür. Lif içermeyen elemanların kırılma enerjisi çentik öteleme oranıyla doğrusal olarak değişmekteyken, çelik liflerin homojen olmayan dağılımından dolayı lifli elemanların kırılma enerjisinde dalgalanmalar görülmüştür.

Keywords

Kırılma mekaniği, atık çelik lif, geopolimer, dijital görüntü korelasyonu

MIXED MODE FRACTURE OF THE GEOPOLYMER COMPOSITES REINFORCED WITH RECYCLED STEEL FIBERS

Abstract

For the fiber-reinforced composites, strength-based criteria alone may fail to evaluate the bending response due to the long tail of the load-displacement curve. Hence, the fracture characterization of fibered composites has gained great attention worldwide. In this study, the mixed-mode fracture performance of the recycled steel fiber-reinforced geopolymer concrete was examined experimentally. The main test parameters were the amount of steel fibers (0 and 2% by mass) and the offset ratios of the edge notch (β = 0, 0.2, and 0.4). Several notched prisms were produced and tested under a deformation-controlled three-point bending test. Deformation maps on the surface of the specimens were derived through the digital image correlation method. Experimental results were discussed concerning the first cracking load, ultimate load, critical crack mouth opening displacement, critical crack mouth sliding displacement, and fracture energy. Based on the experimental findings, it can be stated that the peak flexural loads were increased by 666%, 1327%, and 400%, respectively for the 0, 0.2, and 0.4 notch offset ratios due to the use of recycled steel fiber. The fracture energies of the plain specimens were proportional to the notch offset ratio, but they fluctuated for the fiber-reinforced specimens because of the uneven distribution of fibers.

Keywords

Fracture mechanics, recycled steel fiber, geopolymer, digital image correlation

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