Sound-absorbent element of cement conglomerate, tram platform including this element and process for the manufacture of a sound-absorbent panel of cement conglomerate

摘要

Sound-absorbent element of cement conglomerate having at least one surface which, in use, is turned towards an acoustic wave propagation front. The element comprises a plurality of apertures 22 each having a first end which opens onto the said surface 20 and a second end which leads into a resonant chamber 18 filled with sound absorbent material 24. Figure 4. IMAGE