A semi-empirical model for the formulation of cemented paste backfills according to their potential predicted compressive strength

Tikou Belem, Amal Sahi

In the proceedings of: GeoOttawa 2017: 70th Canadian Geotechnical Conference; 12th joint with IAH-CNC

Session: Mining - Hard Rock II

ABSTRACT: In this paper, a time-dependent semi-empirical model was proposed for predicting the potential strength development of cemented paste backfill (CPB) only from the physical-chemical characteristics of the basic ingredients (i.e., tailings, binder, and mixing water). These characteristics include the chemical composition, the reactivity, and the proportion of binder, the particle size distribution of tailings and the solid mass concentration of the backfill mixtures. Numerous backfill mix recipes were prepared in the laboratory with different types of binder at different proportions and different curing times in order to determine their unconfined compressive strength (UCS). The UCS data were then used for the developed model verification. Overall, it was observed that the semi-empirical model underestimates the experimental data. That is considered satisfactory and very promising since the prediction is conservative.

RÉSUMÉ: Dans cet article, un modèle semi-empirique dépendant du temps a été proposé pour prédire le développement de la résistance potentielle du remblai en pâte cimenté (RPC) uniquement à partir des caractéristiques physico-chimiques des ingrédients de base (c'est-à-dire des résidus, du liant et de l'eau de mélange). Ces caractéristiques comprennent la composition chimique, la réactivité et la proportion de liant, la distribution granulométrique des résidus et le pourcentage solide massique des mélanges de remblai. De nombreuses recettes de RPC ont été préparées en laboratoire avec différents types de liants à différentes proportions et différents temps de durcissement (cure) afin de déterminer leur résistance à la compression non confinée (UCS). Les données UCS ont ensuite été utilisées pour la vérification du modèle développé. Dans l'ensemble, on a observé que le modèle semi-empirique sous-estime les données expérimentales. Cela est considéré comme satisfaisant et très prometteur car la prédiction est conservatrice.

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Cite this article:
Tikou Belem; Amal Sahi (2017) A semi-empirical model for the formulation of cemented paste backfills according to their potential predicted compressive strength in GEO2017. Ottawa, Ontario: Canadian Geotechnical Society.

@article{geo2017Paper840,author = Tikou Belem; Amal Sahi,title = A semi-empirical model for the formulation of cemented paste backfills according to their potential predicted compressive strength,year = 2017}