Thermal conductivity of cemented paste backfill material and factors affecting it

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 article 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 Analyser. Valuable results with regards to the effects of CPBs mix components, curing time and temperature, and water saturation degree on the thermal conductivity of CPB were gained. It is felt that the present study would contribute to the better optimisation of CPB mixtures and the design of more cost-effective and durable CPB underground structures.