Flexural Characteristics of Engineered Cementitious Composites

Year 2024, , 1365 - 1374, 25.09.2024

Serhat Demirhan

https://doi.org/10.2339/politeknik.1224004

Abstract

Cement-based materials such as concrete are brittle materials, and microstructural cracks occur when tensile strength is exceeded. The formation of cracks in the structures allows the aggressive chemical components to easily penetrate and pass into the cement-based material, thus reducing the durability of the material. Many attempts have been made to overcome the negative aspects of the brittle behavior of cementitious materials under load. Engineered Cementitious Composites (ECC) with highly increased ductility is one such initiative. ECC is a high-performance PVA fiber-reinforced cementitious composite with high ductility and high damage tolerance characteristics under mechanical loading. In the current experimental study, it was aimed to investigate the change in flexural toughness of engineered cementitious composites (ECC) containing high volume of ground granulated blast furnace slag (GGBFS). Thus, the effect of both utilization rate of GGBFS and aggregate on the flexural toughness of the designed mixtures was evaluated for the curing age of 28 day. Accordingly, a total of eight different mixtures with GGBFS to binder ratios of 0.6, 0.7, 0.8 and 0.9 and aggregate to binder ratios of 0.36 and 0.45 were produced. The water to binder ratio was kept constant as 0.3 and the maximum particle size of aggregate was 600 µm. Test results showed that a decrease and an increase in flexural toughness were obtained with the increase in both GYFC substitution ratio and aggregate-binder ratio, respectively.

Keywords

Flexural toughness, Ground granulated blast furnace slag, Engineered cementitious composites

Tasarlanmış Çimento Esaslı Kompozitlerin Eğilme Özellikleri

Abstract

Beton gibi çimento esaslı malzemeler gevrek malzemeler olup, çekme dayanımına erişildiğinde mikroyapısal çatlaklar oluşur. Yapılarda çatlak oluşumu, agresif kimyasal bileşenlerin çimento esaslı malzemeye kolayca nüfuz edip geçmesine izin vererek malzemenin servis ömrünü azaltmaktadır. Çimento esaslı malzemelerin yük etkisi altındaki gevrek davranışının olumsuz yönlerinin üstesinden gelmek için birçok girişimde bulunulmuştur. Sünekliği yüksek seviyelerde arttırılmış olan Tasarlanmış Çimento Esaslı Kompozitler (ECC) bu girişimlerden biridir. ECC, mekanik yükleme altında yüksek süneklik gösteren ve yüksek hasar toleransı karakteristiğine sahip yüksek performanslı lif takviyeli çimento esaslı bir kompozit türüdür. Mevcut deneysel çalışmada, yüksek oranda granüle yüksek fırın cürufu (GYFC) içeren ve şekil değiştirme sertleşmesi davranışı sergileyen tasarlanmış çimento esaslı kompozitlerin eğilme tokluğundaki değişimin incelenmesi hedeflenmiştir. Böylece, üretilen karışımların 28 günlük kür yaşı için hem yüksek fırın cürufu hem de agrega kullanım oranının eğilme tokluğu üzerine olan etkisi değerlendirilmiştir. Bu doğrultuda, GYFC-bağlayıcı oranı 0.6, 0.7, 0.8 ve 0.9 ve agrega-bağlayıcı oranı ise 0.36 ve 0.45 olan toplam sekiz farklı karışım üretilmiştir. Tüm karışımlarda su/bağlayıcı oranı 0.3 ve en büyük agrega tane boyutu ise 600 m olarak seçilmiştir. Test sonuçları, GYFC ikame oranı ve agrega-bağlayıcı oranındaki artışla sırasıyla eğilme tokluğunda azalma ve artış elde edildiğini göstermiştir.

Keywords

Eğilme tokluğu, Granüle Yüksek fırın Cürufu, Tasarlanmış çimento esaslı kompozitler

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