Aluminum sound barriers, made of high quality aluminum steel, has three-layer structure. The first layer is perforated absorptive aluminum sheet with round holes or shutter aluminum sheet with louver holes; the second layer is sound absorbing material infill, such as glass wool; the third layer is reflective aluminum sheet with smooth surface. Aluminum sound barriers features the non-corrosion nature and light weight, and it is widely used for highway noise barrier.
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