EVALUATION OF CURING TIME FOR MICRO CONCRETE MIXES CONTAINING SILICA FUME, NANO-SILICA AND FLY ASH

Abstract

Within the scope of the study, research on the use of silica fume (SF), nano silica (NS) and fly ash (FA) together or separately in the production of micro concrete is presented. It is aimed to examine the changes in mechanical properties because of water and air curing in mixtures produced using SF, FA, and NS. While cement dosage and water/binder ratio in the mixtures were chosen as 670 kg/m3 and 0.53 respectively, the amount of SF, FA and NS was limited to 150 kg/m3 in total. In the study, samples were produced using 40x40x160 mm prism molds. All samples were divided into two different groups after 7 days of water curing and water (1st group) and air (2nd group) were applied up to 56 days. Flexural and compressive strength tests were performed on the water and air cured specimens for 7-56 days and 28-56 days, respectively. In addition, the porosity and unit volume weight values of the samples were examined. The results show that both flexural and compressive strengths of micro concretes increased after 28 days thanks to water curing.

Keywords

• Micro-Concrete
• Silica Fume
• Nano Silica
• Fly Ash

SİLİKA DUMANI, NANO-SİLİKA VE UÇUCU KÜL İÇEREN MİKRO BETON KARIŞIMLARI İÇİN KÜR SÜRESİNİN DEĞERLENDİRİLMESİ

Abstract

Çalışma kapsamında mikro beton üretiminde silis dumanı (SD), nano silika (NS) ve uçucu külün (UK) birlikte veya ayrı ayrı kullanımına yönelik araştırmalar sunulmaktadır. SD, UK ve NS kullanılarak üretilen karışımlarda su ve hava kürlenmesi nedeniyle mekanik özelliklerde meydana gelen değişikliklerin incelenmesi amaçlanmaktadır. Karışımlarda çimento dozajı ve su/bağlayıcı oranı sırasıyla 670 kg/m3 ve 0.53 olarak seçilirken SD, UK ve NS miktarı toplamda 150 kg/m3 ile sınırlandırılmıştır. Çalışmada 40x40x160 mm prizma kalıpları kullanılarak numuneler üretilmiştir. Tüm numuneler 7 gün su küründen sonra iki farklı gruba ayrıldı ve 56 güne kadar su (1. grup) ve hava (2. grup) uygulandı. Su ve hava ile kürlenen numunelere sırasıyla 7-56 gün ve 28-56 gün boyunca eğilme ve basınç dayanımı testleri yapılmıştır. Ayrıca numunelerin gözeneklilik ve birim hacim ağırlık değerleri incelenmiştir. Sonuçlar, su kürü sayesinde mikro betonların hem eğilme hem de basınç dayanımlarının 28 gün sonra arttığını göstermektedir.

Keywords

• Micro Beton
• Silis Dumanı
• Nano Silika
• Uçucu Kül

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