The composite casting board of sound absorption and isolation is made up of a sound-absorption casting board as the panel and a metal board as the backplane with cavity in the middle.In the manufacture of this board, a polyurethane board is taken as a carrier.Then, it is coated by mixed cream including some basic components such as casting powder, additives, water and gelatin.After vibrational consolidation process, this board is solicited in the natural environment.Taking the composite casting board of sound absorption and isolation, which consists of 30mm thick acoustical casting board, 69mm thick cavity and 1mm thick galvanized steel sheets, its noise reduction coefficient (NRC) can reach 0.62, and the air-acoustic weighted isolation Rw can reach 28dB.The research shows that if this kind of board is used in road noise barrier project, the noise reduction volume will reach 6.1 dB in the sound shadowing region of a 2.8m high noise barrier.%铸石复合吸隔声板是由铸石吸声板作为面板、中间留有空腔,以金属板为背板的复合吸隔声板.铸石吸声板是利用聚氨酯作为载体,以铸石粉、添加剂、水和胶搅拌成的浆料,涂挂于载体上,通过振动后自然固化而制成.由厚30 mm铸石吸声板、厚69 mm空腔、厚1 mm镀锌钢板组成的总厚100 mm的铸石复合吸隔声板,降噪系数NRC达到0.62,空气声计权隔声量Rw达到28 dB.将该铸石复合吸隔声板应用到道路声屏障工程中,高2.8 m的声屏障其声影区内降噪量达到6.1 dB.
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