Strength development and sorptivity of tailings shotcrete under various thermal and chemical loads

The management and disposal of tailings is a major technical challenge for the mining industry as well as an environmental concern in many countries. Finding alternative recycling methods of tailings as construction materials in mining operations or mine sites has become a great challenge for the mining and civil engineering community. A promising technology with alternative usage of tailings as construction and support materials in mine sites is tailings shotcrete (TSC), a mixture of fine tailings, high cement content, and water. However, the understanding of the strength development and durability of TSCs is limited. Hence, this paper presents the results of experimental investigations for the strength development and sorptivity of TSCs under various chemical (sulphate), thermal or thermochemical loading conditions. Several TSC samples with different sulphate contents, cured at different temperatures (2 °C to 50 °C) and different times (1 to 120 d) are tested with regards to their strength, sorptivity, ...

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