Effect of the Partial Replacement of Blast Furnace Slag and Perlite on the Mechanical and Microstructural Properties of Cemented Paste Backfill

Öz

Recently, the utilization of natural and artificial pozzolans for the partial replacement of Ordinary Portland cement (OPC) has become widespread to be increased the strength and durability, be improved the resistance to acid and sulphate effect and be reduced binder costs of cemented paste backfill (CPB). In this study, the effect of partial replacement of blast furnace slag (BFS) and perlite (P) was investigated on the mechanical and microstructural properties of CPB. A total of 84 CPB samples prepared with the replacement of 20 wt.% of BFS and P were subjected to the uniaxial compressive strength (UCS) and porosity tests at 7, 14, 28 and 56 days of curing periods. The CPB samples with replacement of BFS produced lower UCS than OPC samples at 7-14 days, while, they exceeded the UCS of OPC samples at 28-56 days of curing time. When the porosity results were examined, the porosity of BFS samples demonstrated more improvement with increasing the curing times. CPB samples with replacement of perlite were weak in terms of improvement of UCS and porosity. The findings indicated that the utilization of partial replacement of BFS in CPB is beneficial on the mechanical and microstructural properties of CPB.

Anahtar Kelimeler

• Compressive strength,Porosity,Cemented paste backfill,Blast furnace slag,Perlite

Yüksek Fırın Cürufu ve Perlit İkamesinin Çimentolu Macun Dolgunun Mekanik ve Mikroyapı Özelliklerine Etkisi

Öz

Son yıllarda Portland çimentosu (PÇ) yerine belirli oranlarda doğal ve yapay puzolanların kullanılması, çimentolu macun dolgunun (CPB) dayanım ve duraylılığının iyileştirilmesi, asit ve sülfat etkisine karşı direncinin arttırılması ve bağlayıcı maliyetlerinin azaltılması için oldukça yaygın hale gelmiştir. Bu çalışmada yüksek fırın cürufu (YFC) ve perlit (P) ikamesinin CPB’nin mekanik ve mikroyapı özelliklerine etkisi araştırılmıştır. PÇ yerine ağırlıkça %20 YFC ve P ikame edilerek hazırlanan 84 adet CPB numunesi 7, 14, 28 ve 56 günlük kür süreleri sonunda tek eksenli basınç dayanımı ve gözeneklilik (porozite) testlerine tabi tutulmuştur. YFC’li numuneler 7-14 günde PÇ numunelerine göre daha düşük dayanım üretirken 28-56 günde bu numunelerin basınç dayanımını geçmiştir. Gözeneklilik sonuçları incelendiğinde, YFC’li numunelerin gözenekliliği kür süresinin artmasıyla daha fazla iyileşme göstermiştir. Perlit katkılı numuneler ise basınç dayanımı ve gözeneklilik gelişimi açısından zayıf kalmıştır. Elde edilen bulgular YFC’nin CPB içerisinde belirli oranlarda kullanımının mekanik ve mikroyapı özellikleri açısından faydalı olduğunu göstermiştir.

Anahtar Kelimeler

• Basınç dayanımı,Gözeneklilik,Çimentolu macun dolgu,Yüksek fırın cürufu,Perlit

Kaynakça

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