Geotechnical properties of cemented paste backfill and tailings liners: Effect of mix components and temperature

Abstract

Cemented Paste Backfill (CPB) is extensively used in underground mine operations. Several studies have been conducted to investigate the mechanical properties of CPB. However, little attention has been devoted to the thermal conductivity of CPB. The knowledge of this thermal property is vital for the design of cost-effective and durable CPB materials. This paper presents the results of a comprehensive laboratory study on the thermal conductivity of CPB. Influencing factors on the thermal conductivity of CPB were quantitatively investigated. The measurements of thermal conductivity were performed by using the KD2 Thermal Properties Analyzer. Valuable results with regards to the effects of CPB's mix components, curing time and temperature, water saturation degree on the thermal conductivity of CPB were gained. It is felt that the present study would contribute to the better optimization of CPB mixtures and the design of more cost-effective and durable CPB underground structures. Keywords. Cemented Paste Backfill; Thermal Conductivity; Hydration; Temperature; Sulphate; Tailings.