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

Muhammed Gümüş; Hakan Bayrak

doi:10.17780/ksujes.1375088

EN TR

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

ATIK ÇELİK LİFLERLE GÜÇLENDİRİLMİŞ GEOPOLİMER BETONLARDA KARIŞIK MOD KIRILMASI

Öz

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.

Anahtar Kelimeler

Kaynakça

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Ayrıntılar

Birincil Dil

İngilizce

Konular

Kırılma Mekaniği , Yapı Malzemeleri

Bölüm

Araştırma Makalesi

Yazarlar

Muhammed Gümüş ^*
0000-0002-7380-0098
Türkiye

Hakan Bayrak
0000-0001-9441-2214
Türkiye

Yayımlanma Tarihi

3 Mart 2024

Gönderilme Tarihi

12 Ekim 2023

Kabul Tarihi

8 Kasım 2023

Yayımlandığı Sayı

Yıl 2024 Cilt: 27 Sayı: 1

DOI

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

IZ

https://izlik.org/JA92CG59ED

Kaynak Göster

RIS / Bibtex

APA

Gümüş, M., & Bayrak, H. (2024). MIXED MODE FRACTURE OF THE GEOPOLYMER COMPOSITES REINFORCED WITH RECYCLED STEEL FIBERS. Kahramanmaraş Sütçü İmam Üniversitesi Mühendislik Bilimleri Dergisi, 27(1), 232-242. https://doi.org/10.17780/ksujes.1375088