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57ime CONGRS CANADIEN DE GOTECHNIQUE 57TH CANADIAN GEOTECHNICAL CONFERENCE 5ime CONGRS CONJOINT SCG/AIH-CNN 5TH JOINT CGS/IAH-CNC CONFERENCE
 

Summary: 57ième CONGRÈS CANADIEN DE GÉOTECHNIQUE 57TH CANADIAN GEOTECHNICAL CONFERENCE
5ième CONGRÈS CONJOINT SCG/AIH-CNN 5TH JOINT CGS/IAH-CNC CONFERENCE
EFFECT OF BINDER TYPE AND MIXING WATER CHEMISTRY ON
MICROSTRUCTURAL EVOLUTION OF CEMENTED PASTE BACKFILL
Serge Ouellet, Université du Québec en Abitibi-Témiscamingue, Rouyn-Noranda, Canada
Bruno Bussière, Université du Québec en Abitibi-Témiscamingue, Rouyn-Noranda, Canada
Mostafa Benzaazoua, Université du Québec en Abitibi-Témiscamingue, Rouyn-Noranda, Canada
Michel Aubertin, École Polytechnique, Montréal, Canada
Tikou Belem, Université du Québec en Abitibi-Témiscamingue, Rouyn-Noranda, Canada
ABSTRACT
Mercury intrusion porosimetry (MIP) tests were performed on 54 hardened cement paste (CP) (w/c = 0.33) and cemented
paste backfill (CPB) (w/c = 7) samples. Three binders (PC type 10, PC T10-fly ash, PC T10-blast furnace slag) and three
waters containing different sulphate proportions ( 0, 4613, 7549 ppm) were used in the specimen preparation process.
Cement paste study showed microstructural differences between binders and to identify the main influence factors of the
microstructural evolution before the porosimetry tests performed on cemented paste backfill samples. MIP results on
CPB indicate that despite a constant total porosity, pore size diameter decreased with curing time. Pore refinement was
more important with the slag binder, which would explain higher mechanical strength with this binder. Moreover, the
effect of sulphate ions in mixing water was positive on pore refinement and on strength evolution. Tests showed a direct
relationship between mechanical strength and pores refinement; and that MIP technique is an efficient tool to evaluate
microstructure of CPB.

  

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

 

Collections: Engineering; Environmental Management and Restoration Technologies