Investigation of Flexural, Compressive Strength and Microstructure of Silica Fume Added Steel Fiber Concrete

Abstract

Concrete is the most extensively used construction material today, and cement is used as the bonding agent in the concrete production. Use of silica fume in steel fiber concretes is suitable for high-strength and high-quality concrete production. In this study, tests were conducted using silica fume in steel fiber concretes by 0 %, 5 %, 10 % and 15 % via replacement with cement. CEM I 42.5 N cement and steel fiber were used in the concrete produced during the tests. Samples were selected from C 25 class in which water/cement ratio was 0.50 and produced by being subjected to vibration. Test samples were subjected to a flexural test from their midpoints and a compression test from the edges on prism samples produced at sizes of 100 mm x l00 mm x 500 mm. 7 day and 28 day flexural and compression strength tests of the concretes produced were measured. Besides, hydration products in concrete were observed with scanning electron microscope, energy dispersive spectrometry, and x-ray diffraction. As a result, it was determined that as the amount of silica fume increased, there was an increase in flexural and compressive strength.

Keywords

• Concrete
• silica fume
• steel fiber
• flexural and compressive strength
• Pushover

Silis Dumanı Katkılı Çelik Lifli Betonun Eğilme, Basınç Dayanımı ve Mikro Yapısının İncelenmesi.

Abstract

Beton günümüzde en yaygın kullanılan yapı malzemesi olup, beton üretiminde bağlayıcı madde olarak çimento kullanılmaktadır. Çelik lifli betonlarda silis dumanının kullanılması yüksek dayanımlı ve kaliteli beton üretimi için uygundur. Bu çalışmada çelik lifli betonlarda silis dumanı kullanılarak %0, %5, %10 ve %15 oranlarında çimento ile ikame edilerek testler yapılmıştır. Testler sırasında üretilen betonda CEM I 42,5 N çimento ve çelik elyaf kullanıldı. Numuneler su/çimento oranı 0,50 olan C 25 sınıfından seçilmiş ve vibrasyona tabi tutularak üretilmiştir. Test numuneleri 100 mm x 100 mm x 500 mm ölçülerinde üretilen prizma numuneler üzerinde orta noktalarından eğilme testine, kenarlarından ise basma testine tabi tutuldu. Üretilen betonların 7 günlük ve 28 günlük eğilme ve basınç dayanım testleri ölçüldü. Ayrıca betondaki hidratasyon ürünleri taramalı elektron mikroskobu, enerji dağılımlı spektrometri ve x-ışını kırınımı ile gözlemlendi. Sonuç olarak silis dumanı miktarı arttıkça eğilme ve basınç dayanımında artış olduğu belirlendi.

Keywords

• Pushover
• Beton.
• Çelik lif,
• eğilme ve basınç dayanımı

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