EFFECT OF NATURAL ALKALINE MATERIALS ON THE STRENGTH-STABILITY AND MICROSTRUCTURE PERFORMANCE OF CEMENTED PASTE BACKFILL

Abstract

In this study, the usability of natural alkaline materials (NAL-M) as partial replacement (5-15wt.%) to sulphide-mine tailings (S-MT) in cemented paste backfill (CPB) was investigated. Control samples were prepared at 8.5wt.% binder dosage, whilst, CPB samples containing NAL-M were produced by utilising the calcitic and dolomitic limestone at 7.5-8.5 wt.% cement dosages. Compressive strength between 7-360 days and microstructure tests at 28-180 days were performed on the samples. The strength-stability findings demonstrated that the replacement of NAL-M increased the strength of CPB, and decreased the strength loses occurred at long-term. The minimum compressive strength (≥1.0 MPa) desired during 28-360 days was provided except CPB samples (7.5 wt.%) containing 5wt.% NAL-M. When the microstructure results were evaluated, the total porosity (ntot) values of all samples were decreased with the increase of curing time, and the replacement of 15wt.% NAL-M to S-MT decreased the ntot of samples compared to Control samples. Considering the strength-stability and microstructural performance of CPB, and the possible environmental problems caused by NAL-M, the results revealed that the utilisation of these materials in CPB mixtures can be beneficial.

Keywords

• Cemented Paste Backfill
• Sulphide Mine Tailings
• Natural Alkaline Materials
• Strength-Stability
• Microstructure

Project Number

FDK 2016-5500

DOĞAL ALKALİ MALZEMELERİN ÇİMENTOLU MACUN DOLGUNUN DAYANIM-DURAYLILIK VE MİKROYAPI PERFORMANSINA ETKİSİ

Abstract

Bu çalışmada, çimentolu macun dolgu (ÇMD) içerisinde doğal alkali malzemelerin (DAL-M) sülfürlü maden atığına (S-MA) ikame (%5-15) olarak kullanılabilirliği araştırılmıştır. Kontrol numuneleri %8,5 bağlayıcı oranında hazırlanırken, DAL-M ikameli numuneler %7,5-8,5 bağlayıcı oranında S-MA yerine kalsitik ve dolomitik kireçtaşı kullanılarak üretilmiştir. Numuneler üzerinde 7-360 gün aralığında basınç dayanımı ve 28-180 günde mikroyapı testleri uygulanmıştır. Dayanım-duraylılık bulguları, DAL-M ikamesinin ÇMD’nin dayanımını arttırdığını ve uzun dönemde meydana gelen dayanım kayıplarını azalttığını göstermiştir. Ayrıca, 28-360 gün boyunca istenen asgari basınç dayanımı (≥1,0 MPa) %5 DAL-M ikameli ÇMD numuneleri (%7,5) haricinde sağlanmıştır. Mikroyapı sonuçları değerlendirildiğinde, kür süresinin artmasıyla tüm numunelerin toplam poroziteleri (ntop) azalmış ve Kontrol numuneleri ile karşılaştırıldığında, S-MA yerine yapılan %15 DAL-M ikamesi numunelerin ntop değerlerini düşürmüştür. ÇMD’nin dayanım-duraylılık ve mikroyapı performansı ve DAL-M’lerin oluşturduğu olası çevresel problemler göz önüne alındığında, sonuçlar, bu malzemelerin ÇMD karışımlarında kullanımının faydalı olabileceğini ortaya koymuştur.

Keywords

• Çimentolu Macun Dolgu
• Sülfürlü Maden Atığı
• Doğal Alkali Malzemeler
• Dayanım-Duraylılık
• Mikroyapı.

Supporting Institution

Karadeniz Teknik Üniversitesi Bilimsel Araştırma Projeleri Birimi

Project Number

FDK 2016-5500

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