Çimento esaslı kompozitlerde karma lif kullanımı

Yıl 2017, Cilt: 23 Sayı: 6, 671 - 678, 15.12.2017

Kazım Türk , Ceren Kına

Öz

İnşaat sektöründeki gelişmelerle birlikte çok
yüksek katlı betonarme binaların yaygınlaşması, altyapıya verilen önemin
artması, nükleer enerji alanındaki yatırımların söz konusu olması gibi gelişmelerden
dolayı beton teknolojisinde lif kullanımı büyük bir önem kazanmıştır.
Dolayısıyla, bu lif takviyeli kompozitin özellikle, süneklik özelliğine sahip
olması gerektiği açıktır. Lif takviyeli kompozitler yapısal elemanların
sünekliğini arttırarak, deprem, roket darbeleri ve patlamalar gibi aşırı
deplasman oluşturan olayları esnasında büyük miktarda enerji yutarak
ileri düzeyde yapısal göçmeyi engellemek için tasarlanmaktadır. Bu
kompozitlerin inşaat sektöründe kullanılmasıyla birlikte, çok yüksek betonarme
binaların inşa edilebilmesi, önemli altyapı elemanlarının dayanıklılığının ve
ekonomik ömrünün arttırılabilmesi, nükleer enerji santrallerinin güvenliği
açısından büyük önem arz eden korunak binalarının daha güvenli yapılabilmesi,
betonarme taşıyıcı elemanların kesit ve donatı oranlarında azalmalara
gidilebilmesi çok daha mümkün olabilmektedir. Bu bağlamda, beton teknolojisinde
yukarıda belirtilen kompozit özelliklerinin sağlanması açısından lif
kullanımının önemi artmaktadır. Değişik malzeme özelliklerine sahip lif
türlerinin tek veya farklı lif kombinasyonlarıyla birlikte karma olarak
kullanımıyla daha gelişmiş kompozitler üretmenin mümkün olduğu yapılan
incelemeler sonucunda tespit edilmiştir. Bu makalede, çimento esaslı kompozit
üretiminde lif kullanımının önemi, lif tipleri ve kullanım şekilleri (tek lif
ve karma lif) ve makro ve mikro lif türlerinin karma lif takviyeli
kompozitlerin mühendislik özellikleri üzerine etkileri araştırılmıştır.
Sonuçta, çoklu çatlak oluşumu ve yüksek çekme dayanımı gibi avantajları
nedeniyle inşaat sektöründe karma lif takviyeli kompozit kullanımı büyük önem
kazanmaktadır.

Anahtar Kelimeler

Çimento esaslı kompozit, Karma lif, Mikro ve makro lif, Süneklik

The use of hybrid in cementitious composites

Öz

With
the developments in the construction sector, the use of fiber in concrete
technology has gained great importance due to the developments of the spread of
high rise concrete buildings, the increasing importance given to
infrastructure, investments in nuclear energy field. Therefore, it is clear
that this fiber reinforced composite especially should have also ductility
properties. Fiber reinforced composites are designed in order to prevent
extremely structural collapse by absorbing massive amount of energy during
extreme load-displacement events such as earthquakes, projectile impacts and
explosions. It will be much more possible with using this composite in the
construction sector to construct much higher concrete building, increase the
economic life and strength of important infrastructure members, construct more
secure containment buildings which is important for the safety of nuclear power
plant, reduce the section and reinforcement ratios in reinforced concrete
structural members. In this regard, in the concrete technology in order to
provide the above mentioned composite properties, the significance of fiber
usage has increased. It was found from studies made that it is possible to
produce more developed composites using hybrid fiber having different
properties with single or different fiber combinations. In this paper, the
significance of the use of fiber for producing the cementitious composite,
fiber types and the using forms (single or hybrid) and the effects of micro and
macro fiber types on the engineering properties of the hybrid fiber reinforced
composites are investigated. Finally, at construction sector the use of hybrid
reinforced composites has gained great importance due to the formation of
multiple crack and high tensile strength.

Anahtar Kelimeler

Cementitious composite, Hybrid fiber, Micro and macro fiber, Ductility

Kaynakça

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