Study on Shotcrete for the Track of National Sliding Centre for Beijing Winter Olympic Games

The track of National Sliding Centre is a long linear space hyperbolic panel shell structure, which cannot be realized by conventional concrete construction techniques, so shotcrete is used for the track structure. As the domestic existing shotcrete adopted the mixing accelerator injection method and the setting time was short, it might cause track roughness to not meet the planeness requirements of millimeter-grade on the track surface. Based on a large number of tests, an accelerator system of high compactness, good pumping performances, cohesive performances for shotcrete was obtained, which was applied in the construction of the tracts for the National Sliding Centre. The application practice proved that the structure of shotcrete system could well meet the construction requirements of millimeter-grade track surface modification.