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Summary: 1 INTRODUCTION
The recovery of underground hard rock ore bodies
often involves the use of mine fills. The type of mine
fill depends on the mining methods and sequences.
Where later recovery is dependent on stability of ex-
posures of earlier placed fill, cement and/or cementi-
tious materials are added to the fill. Once such fill
type is pastefill which is in fact becoming a standard
practice in Canada (e.g. Landriault 1995, Landriault
& Tenbergen 1995, Naylor et al. 1997). However,
the use of pastefill to maintain ground stability in-
volves some difficulties related to the complexities
of its behaviour. These complexities are due to the
continuous evolution of the properties of cemented
fill during placement, consolidation, and hardening
due to the hydration of binder agents.
Despite recent work conducted on cemented fills
(e.g. Hassani & Archibald 1998, Benzaazoua et al.
2002, Bernier et al. 1999, Benzaazoua & Belem
2000, Belem et al. 2002) many questions remain
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