New Advancements in Dry Mix Shotcrete Using Rapid Set Cement in Lieu of Accelerator Admixtures in Tunnels, Shafts, and Pipe Liners

摘要

In the mining and tunneling industries time is critical, and as the mining/tunneling cycle becomes shorter production increases. Shotcrete is often used for ground support when using the drill and blast method or other tunneling methods. But before re-opening access for the next phase of the underground heading, the applied shotcrete is required to reach a minimum compressive strength in order to ensure the safety of the workers going into the heading. This article demonstrates the possibility of speeding up significantly mining and tunnelling process using calcium sulfo-aluminate cement in dry-mix process shotcrete mixes.