Abstract
This paper introduces the acoustic characteristics of the sound absorptive ceramics and their application for outdoor barriers. The developed sound absorptive ceramics, a kind of porous plates, are produced by binding the particles of hard porcelain with glaze. They have excellent weather‐durability and water‐ and fire‐resistant characteristics in striking contrast with conventional sound absorptive materials, such as glass wool and rock wool. The sound absorption coefficient curves of the ceramic show the combined characteristics of resonant‐type and porous‐type absorbers. The ceramic sound barriers constructed for transformer and other equipments noise sources showed the superior effect of noise reduction than that predicted by Maekawa's formula. The ceramics are also applicable for the acoustic treatment of ventilating ducts, steam‐exhaust silencers, machine rooms, and barriers for roads and railways, etc.
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