Table 1 Subway material composition indicators (MCIs) of Chinese cities.
From: Global urban subway development, construction material stocks, and embodied carbon emissions
Material | Tunnel (t/km) | Station (t/unit) | Ancillary road (t/unit) | Entrance and exit (t/unit) | Ventilation system (t/unit) |
|---|---|---|---|---|---|
Asphalt | / | 9.4 | 3021.0 | 0.7 | 1.0 |
Cement | 1440.2 | 9233.9 | 1250.7 | 637.2 | 814.8 |
Copper | / | 4.5 | / | / | / |
Fly ash | 593.0 | 3802.2 | 515.0 | 262.4 | 335.5 |
Geotextile | 0.04 | / | 1.3 | / | / |
Gravel | 8471.9 | 54,317.3 | 8035.9 | 3748.2 | 4793.2 |
Silica fume | 677.8 | 4345.4 | 588.6 | 299.9 | 383.5 |
Mortar | / | 2612.4 | / | 37.8 | 397.6 |
Sand | 7201.1 | 46,169.7 | 6253.5 | 3186.0 | 4074.2 |
Steel | 1144.6 | 9121.6 | / | 690.6 | 1042.2 |
Waterproof | 0.5 | 8.5 | / | 10.0 | 12.2 |
Total | 19,529 | 129,625 | 19666 | 8873 | 11,854 |
