Investigations into strength of Cannington paste fill mixed with blended cements

Pirapakaran, Kandiah, Sivakugan, Nagaratnam, and Rankine, Rudd (2007) Investigations into strength of Cannington paste fill mixed with blended cements. In: Common Ground. Proceedings of the 10th Australia New Zealand Conference on Geomechanics (2), pp. 144-149. From: 10th Australia New Zealand Conference on Geomechanics, 21-24 Oct 2007, Brisbane, QLD, Australia.

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Abstract

Paste fill is an innovative tailings management method that returns between 45% and 50% of the tailings back to the underground workings. Paste fill consists of tailings, water and binder. The binder has typically been Portland cement (PC), but a recent trend has seen it move towards blended cements. Blended cements are generally characterised by very slow early strength development, followed by the attainment of good ultimate strength. Blends comprising 100% PC, 75% PC & 25% Flyash and 30% PC & 70% slag were tested, adding 3%, 3.5% and 4% by total dry mass of tailings having solids contents of 79%, 80% and 81 %. The specimens were subjected to uniaxial compressive strength after curing periods of 7, 14, 28 and 56 days. The flow properties of 3.5% paste fill mixtures with each type of binder were investigated using yield stress tests. The results provided an understanding of the effect of binders, solids contents and curing period in the selection of optimal paste fill mixture. It was observed that slag-based paste fill had higher strength compared to the other two paste fills, however after considering the cost of binders, the 3.5% Flyash binder with 80% solids content tailings was chosen as an optimal mixture for strength and flow properties.

Item ID: 3043
Item Type: Conference Item (Refereed Research Paper - E1)
Keywords: pastefill; minefill; tailings; UCS; blended cements; Cannington
Additional Information:

ISBN: 978-0-646-47974-3
Date Deposited: 08 Oct 2009 04:35
FoR Codes: 09 ENGINEERING > 0999 Other Engineering > 099999 Engineering not elsewhere classified @ 100%
SEO Codes: 84 MINERAL RESOURCES (excl. Energy Resources) > 8499 Other Mineral Resources (excl. Energy Resources) > 849999 Mineral Resources (excl. Energy Resources) not elsewhere classified @ 100%
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