Çimentolu Macun Dolgunun Dayanım ve Mikroyapı Özellikleri; C-Sınıfı Uçucu Külün Etkisi

Yıl 2019, Cilt: 21 Sayı: 61, 15 - 23, 15.01.2019

Bayram Erçıkdı , Tekin Yılmaz

Öz

Bu çalışmada, sülfürlü atık yerine
ağırlıkça %5-15 oranında C-sınıfı uçucu kül (UK) ikamesinin çimentolu macun
dolgunun (ÇMD) dayanım ve mikroyapı özelliklerine etkisi incelenmiştir. Bu
kapsamda kontrol numuneleri %8,5 bağlayıcı oranında, UK içeren dolgu numuneleri
ise %7,5 bağlayıcı oranında hazırlanmıştır. Bu numuneler, tek eksenli basınç
dayanımı (TEBD) ve porozite (MIP) testlerine tabi tutulmuştur. Bulgular
değerlendirildiğinde, UK içeren tüm ÇMD numunelerinin kontrol numunelerine
kıyasla 1,18-3,16 kat daha yüksek TEBD ürettiği gözlemlenmiştir. Dolgunun
stabilite (TEBD≥1,0MPa) kriterini tüm numuneler sağlarken, tavan (zemin)
tahkimatı (TEBD≥5,0MPa) kriterini sadece %15 UK’lı numuneler sağlamıştır.
Porozite (MIP) gelişimleri incelendiğinde, UK ikamesi numunelerin mikroyapı
özelliklerini daha fazla iyileştirmiştir. Elde edilen sonuçlardan, C-sınıfı UK
kullanımının ÇMD’nin dayanım, duraylılık ve mikroyapı özelliklerinin
iyileştirilmesinde oldukça faydalı olduğu sonucuna varılmıştır.

Anahtar Kelimeler

C-sınıfı Uçucu Kül, Sülfürlü Atık, Tek Eksenli Basınç Dayanımı, Mikroyapı, Çimentolu Macun Dolgu

Strength and Microstructure Properties of Cemented Paste Backfill; Effect of Class-C Fly Ash

Öz

In this
study, the effect of Class-C Fly ash (FA) as partial replacement (5-15% by
weight) to sulphide tailings on the strength and microstructure properties of
cemented paste backfill (CPB) was examined. Within this scope, CPB samples of
control were prepared at 8.5 wt.% binder dosage while the other samples
containing FA were prepared at 7.5 wt.% binder dosage. These samples were
subjected to uniaxial compressive strength (UCS) and porosity (MIP) tests.
Findings revealed that all CPB samples containing FA produced notably higher
(1.18-3.16 fold) UCSs than control samples. All CPB samples ensured the
stability criterion for backfill material (UCS≥1.0MPa), whilst, only the CPB
samples containing 15 wt.% FA exceeded the roof (ground) support criterion
(UCS≥5.0MPa). When the developments of porosity (MIP) were investigated, the
partial replacement of sulphide tailings with FA enhanced the microstructure
properties of CPB samples. These results suggest that the utilization of
Class-C Fly ash (FA) as partial replacement to sulphide tailings is highly
beneficial for the improvement of the strength, durability and microstructure
properties of CPB.

Anahtar Kelimeler

Class-C Fly Ash, Sulphide Tailings, Uniaxial Compressive Strength, Microstructure, Cemented Paste Backfill

Kaynakça

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