Yapay Agregalarla Üretilen Betonların Sülfat Etkisinde Mekanik ve Mikroyapısal Özellikleri

Öz

Bu çalışmada, farklı kompozisyonlarda çelikhane cürufu (SS), granüle yüksek fırın cürufu (GBFS) ve öğütülmüş granüle yüksek fırın cürufunun (GGBFS) beton üretiminde kullanılabilirliği araştırılmıştır. Beton karışımlarında, ince agrega olarak GBFS ve iri agrega olarak SS kullanılarak doğal agregalar ile tamamen ikame edilmiştir. Ayrıca, GGBFS çimento ile ağırlıkça %0, %10, %20, %30 ve %40 oranlarında ikame edilerek kullanılmıştır. Doğal ve yapay agregalarla toplamda 10 farklı beton serisi üretilmiştir. Deneysel çalışmalar; kıvam deneyi, basınç dayanımı, ultrasonik ses geçiş hızı (UPV), beton test çekici deneyi, sülfat etkisi deneyi (%5 Na2SO4 ve %5 MgSO4 çözeltileri) ve mikroyapısal analizleri kapsamaktadır. Deney sonuçlarına göre, doğal agrega içeren beton numuneleriyle karşılaştırıldığında, GBFS ve SS agregaları ile üretilen betonların basınç dayanımları daha düşük bulunmuştur. Bununla birlikte hem doğal hem de yapay agrega içeren betonlarda çimentonun belirli oranlarda GGBFS ile ikame edilmesi basınç dayanımında artış sağlamıştır. Na2SO4 ve MgSO4 çözeltilerinde kür edilen beton numuneleri, standart koşullarda kür edilenlere göre daha yüksek basınç dayanımı göstermiş olup, en yüksek artış Na2SO4 çözeltisinde elde edilmiştir.

Anahtar Kelimeler

• Yapay agrega
• çelikhane cürufu
• sülfat etkisi
• basınç dayanımı
• mikroyapı analizi

Effects of Sulfate Exposure on the Mechanical and Microstructural Properties of Concretes Produced with Artificial Aggregates

Öz

This study investigates the usability of steel slag (SS), granulated blast furnace slag (GBFS), and ground granulated blast furnace slag (GGBFS) in concrete production with different compositions. In the mixture, GBFS was used as fine aggregate and SS as coarse aggregate, thus fully replacing natural aggregates. Meanwhile, GGBFS was employed as a mineral admixture by partially substituting cement at rates of 0%, 10%, 20%, 30%, and 40% wt. A total of 10 different concrete series have been produced using natural and artificial aggregates. The experimental investigations encompassed a series of tests and assessments, including slump test, compressive strength, ultrasonic pulse velocity (UPV), rebound hammer test, sulfate attack tests (utilizing 5% Na2SO4 and 5% MgSO4 solutions), and microstructural analyses. According to the experimental results, in comparison with concrete specimens comprising natural aggregates, concrete produced with GBFS and SS aggregates demonstrated reduced compressive strengths. However, the replacement of cement with GGBFS at specific ratios in both natural and artificial aggregate concretes resulted in an increase in compressive strength. Concrete specimens cured in Na2SO4 and MgSO4 solutions exhibited higher compressive strength compared to those cured under standard conditions, with the highest increase observed in the Na2SO4 solution.

Anahtar Kelimeler

• Artificial aggregate
• steel slag
• sulfate effect
• compressive strenght
• microstructure analysis

Kaynakça

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