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Summary: MICROSTRUCTURAL PROPERTIES OF COLUMN
CONSOLIDATED PASTE BACKFILL
Omar El-Aatar et Tikou Belem,
Applied Sciences Université du Québec, Rouyn-Noranda, Quebec, Canada
Bruno Bussière, Mostafa Benzaazoua et Erol Yilmaz
Applied Sciences Université du Québec, Rouyn-Noranda, Quebec, Canada
ABSTRACT
The objective of this study is to characterize the microstructural properties of cemented paste backfill (CPB) after its
self-weight consolidation in columns. To reach this objective, three self-weight consolidation column tests that have
each 3 m height were carried out on in situ CPB samples at Louvicourt mine's backfill plant. These columns simulate
three realistic drainage scenarios such as fully drained (FD), half-drained (HD) and undrained (UD) columns. After a 90-
day curing time, 20 core samples were taken from each consolidated CPB column and subjected to uniaxial
compression tests followed by mercury intrusion porosimetry (MIP) tests and BET (Brunauer-Emmett-Teller) specific
surface analysis. Results showed that the MIP total porosity and the specific surface area data of CPB materials are
well correlated to the uniaxial compressive strength values. Maximum strength (2.9 MPa) was associated with the
completely drained CPB which usually has finer pores, a lower total porosity and a relatively higher specific surface
area. This correlation is appreciably different between the bottom and the top of each column consolidated backfill
material.
RÉSUMÉ
L'objectif de cette étude est de caractériser les propriétés microstructurales des remblais en pâtes cimentés après leur
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