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EVOLUTION OF CEMENTED PASTE BACKFILL SATURATED HYDRAULIC CONDUCTIVITY AT
 

Summary: EVOLUTION OF CEMENTED PASTE BACKFILL
SATURATED HYDRAULIC CONDUCTIVITY AT
EARLY CURING TIME
Jovette Godbout and Bruno Bussière *
Sciences Appliquées ­ Université du Québec en Abitibi-Témiscamingue,
Rouyn-Noranda, Québec, Canada
Michel Aubertin*
Génie minéral - École Polytechnique, Montréal, Québec, Canada
Tikou Belem
Sciences Appliquées ­ Université du Québec en Abitibi-Témiscamingue,
Rouyn-Noranda, Québec, Canada
* Chaire Industrielle CRSNG Polytechnique-UQAT en environnement et gestion des rejets miniers
ABSTRACT
One interesting management approach to reduce environmental impacts related to sulphide mine tailings storage
consists in using them as a component of cemented paste backfill (CPB). CPB consists of a mixture of tailings, binder
agent, and water. Binder hydration in CPB leads to an evolution of the porous matrix and entails a change in
hydrogeotechnical properties of the backfill. Key property to investigate for an efficient management of tailings is the
saturated hydraulic conductivity (ksat). In this study, results of permeability tests performed on cemented paste backfill
samples at different curing times are presented. Results show that the addition of 4.5 % wt of binder can reduce ksat by
a factor of more than ten after 28 days of curing. The kinetic is also different depending on the binder used. Typically, a

  

Source: Aubertin, Michel - Département des génies civil, géologique et des mines, École Polytechnique de Montréal

 

Collections: Engineering; Environmental Management and Restoration Technologies