Karma Lif İçeren Çimento Esaslı Kompozitlerın Mekanik Davranışı – Bir Optimum Tasarım
Karma Lif İçeren Çimento Esaslı Kompozitlerın Mekanik Davranışı – Bir Optimum Tasarım
Dosyalar
Tarih
Yazarlar
Ekincioğlu, Özgür
Süreli Yayın başlığı
Süreli Yayın ISSN
Cilt Başlığı
Yayınevi
Fen Bilimleri Enstitüsü
Institute of Science and Technology
Institute of Science and Technology
Özet
Yüksek dayanım, süneklik ve tokluğa sahip bir optimum çözüme varmak için karma çelik lif ve polipropilen lifle takviyeli çimento esaslı kompozit malzemeler üretildi. Bütün karışımlarda polipropilen lifin hacimsel yüzdesi % 0,05’de sabit tutuldu. Karma çelik liflerin mekanik özeliklere etkisini incelemek için herbir karışıma kancalı ve kancasız üç farklı çelik lif eklendi. Herbir çelik lifin hacimsel yüzdesi değişken olup bunların toplam hacimsel yüzdesi % 3’de sabit tutuldu. Karma çelik lif içeren betonların basınç dayanımı, elastisite modülü, yarmada çekme dayanımı, kırılma enerjisi, net eğilme dayanımı ve karakteristik boyu çelik lif içermeyen betonla karşılaştırıldı.Yüksek narinliğe sahip çelik lif donatılı betonlarda hem kırılma enerjisi hem de eğilme dayanımlarında yüksek değerler elde edildi. Kısa kesilmiş çelik lif içeren betonlarda ise düşük süneklik bulundu. Orta düzeydeki süneklik de karma lif içeren betonlarda görüldü.
Cement based composites reinforced with hybrid steel fibres and polypropylene fibre were produced to achieve an optimum solution which has high values of strength, ductility and toughness. In all mixtures, the volume fraction of polypropylene fibre was kept constant at 0.05 %. Three different steel fibres with and without hooked ends were added to each mixture to investigate the effect of hybrid steel fibres on mechanical properties. The volume fraction of each steel fibre was variable, but the total volume fraction of fibres was kept constant at 3 %. Compressive strength, modulus of elasticity, splitting-tensile strength, fracture energy, net bending strength and characteristic length of concretes with hybrid steel fibres were compared to concrete without steel fibres. High values for both fracture energy and net bending strength were obtained in steel fibre reinforced concretes with high aspect ratios. Low ductility, however, was obtained in concretes with straight short cut steel fibre. The intermediate fracture values were obtained in concretes with hybrid steel fibres.
Cement based composites reinforced with hybrid steel fibres and polypropylene fibre were produced to achieve an optimum solution which has high values of strength, ductility and toughness. In all mixtures, the volume fraction of polypropylene fibre was kept constant at 0.05 %. Three different steel fibres with and without hooked ends were added to each mixture to investigate the effect of hybrid steel fibres on mechanical properties. The volume fraction of each steel fibre was variable, but the total volume fraction of fibres was kept constant at 3 %. Compressive strength, modulus of elasticity, splitting-tensile strength, fracture energy, net bending strength and characteristic length of concretes with hybrid steel fibres were compared to concrete without steel fibres. High values for both fracture energy and net bending strength were obtained in steel fibre reinforced concretes with high aspect ratios. Low ductility, however, was obtained in concretes with straight short cut steel fibre. The intermediate fracture values were obtained in concretes with hybrid steel fibres.
Açıklama
Tez (Yüksek Lisans) -- İstanbul Teknik Üniversitesi, Fen Bilimleri Enstitüsü, 2003
Thesis (M.Sc.) -- İstanbul Technical University, Institute of Science and Technology, 2003
Thesis (M.Sc.) -- İstanbul Technical University, Institute of Science and Technology, 2003
Anahtar kelimeler
Çelik lif,
polipropilen lif,
silis dumanı,
yüksek performanslı beton,
karma lif.,
Steel fibre,
polypropylene fibre,
silica fume,
high performance concrete,
hybrid fibre.