Nano Boyutlu Kalsit ve Uçucu Külün, Harçların Hidratasyonu ve Mikroyapısal Özellikleri Üzerindeki Kombine Etkileri

Year 2020, , 1051 - 1067, 31.12.2020

Serhat Demirhan

https://doi.org/10.35414/akufemubid.825862

Cited By: 5

Abstract

Çimento esaslı malzemelerde uçucu külün kullanılmasıyla kirlilik ve CO2 emisyonunda bir azalma sağlansa da, yüksek hacimde uçucu kül kullanılması, erken yaş mukavemet gelişiminde bir azalma ile neticelenmekte ve ayrıca priz alma süresinde gecikmelere neden olur. Yüksek hacimli uçucu kül katkılı çimento harçlarının hidratasyon mekanizması ve mikroyapısal özelliklerini değerlendirmek amacıyla, uçucu kül (UK) ve nano kalsitin (NK) birleşik etkisini incelemek için harçlara nano boyutlu kalsit eklenmiştir. Bu amaçla, uçucu kül/Portland çimentosu oranı ve NK ikame oranı (% 5'e kadar minör ilave bileşen olarak kullanıldı) sırasıyla 0.0, 0.25, 0.54, 1.0 ve %0, %2.5, %5 olarak yer değiştirilmiş on iki karışım tasarlanmış. Kıvam, priz süreleri, basınç dayanımı, ultrasonik ses hızı (UPV) ve SEM analizi test yöntemine bağlı olarak farklı kür yaşlarında gerçekleştirilmiştir. Deneysel test sonuçları, standart harçların taze ve sertleşmiş özelliklerinin hem UK hem de NK kombinasyonu ile özellikle erken yaşlarda önemli ölçüde iyileştiğini göstermiştir. UK kullanım oranı artışıyla birlikte erken yaş basınç dayanımında azalma gözlemlenmiş olmasına rağmen, kontrol karışımına kıyasen (ki 90 günlük basınç dayanımı 43.2 MPa olarak elde edildi), %50 UK ve %2.5 NK ikame oranlı karışımın 90 günlük basınç dayanımı daha yüksek (45.9 MPa olarak) elde edilmiştir.

Keywords

Taze ve Sertleşmiş Özellikler, Nano Kalsit, Uçucu Kül, SEM

Combined Effects of Nano-Sized Calcite and Fly Ash on Hydration and Microstructural Properties of Mortars

Abstract

Even though a reduction in pollution and CO2 emission can be achieved by the utilization of fly ash in cement-based materials, using a high volume of fly ash results in a reduction at the early age strength development and also setting time delays. In order to assess hydration mechanism and microstructural characteristics of high-volume fly ash blended cement mortars, nano-sized calcite was introduced into the mortars to evaluate the combined effect of fly ash (FA) and nano-sized calcite (NC). For this purpose, twelve mixtures in which fly ash to Portland cement ratios and NC (used as minor addition up to 5%) percentages were varied as 0.0, 0.25, 0.54, 1.0 and 0.0%, 2.5%, 5%, respectively, were designed. Consistency, setting times, compressive strength, ultrasonic pulsive velocity and SEM analysis were conducted at varied curing ages (which depends on the testing method) in terms of fresh and hardened properties and micro-structural characteristics. Experimental test results confirmed that fresh and hardened properties of standard mortars were significantly improved with the combination of both FA and NC especially at early ages. Even though decrease in early age compressive strength values was obtained as FA amount was increased, (comparing to control mixture which was 43.2 MPa at 90 days) higher compressive strength result (45.9 MPa) was obtained at 90-day curing age of mixture including 50% of FA content being utilized by NC of 2.5%.

Keywords

Fresh and Hardened Properties, Nano-Sized Calcite, Fly Ash, SEM

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