| 摘要 |
A building e.g. multi-story building has a ceiling with sandwich construction (1, 3) of fire-retardant materials separated by a layer of fibre-reinforced light concrete (4) and a foam core layer (2). The light concrete may have one or more cavities (5) and is bonded to the sandwich panels after the concrete has cured. The panels are placed alongside a heavy concrete core
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