Impact noise isolation of prefabricated ribbed slab with prestressed joist and ceramic block

Abstract Impact noise is one of the main discomfort factors among users of multi-storey buildings. Thus, this research seeks to: determine the acoustic properties of insulation against impact noise in the prefabricated ribbed slab system, composed of prestressed joists and ceramic blocks in three montage compositions, evaluate the performance of insulation against impact noise of the technique on floating floor over the slab, using fifteen different resilient materials, and compare the results obtained for the various compositions with the Brazilian criteria of performance standard 15575-3:2013. The tests were carried out in the UFSM laboratory, in accordance with ISO 140-7 parameters updated to ISO 16283-2:2020, and ISO 717-2:2020, to determine the weighted standard impact sound pressure level ( L' nT,w ) of each composition tested. It can be concluded that the constructive typology, with a 4 cm subfloor and ceramic coating, needs acoustic treatment to fit the Brazilian regulations, and that the use of the floating floor technique is a good solution, since the great majority compositions with resilient materials reach an intermediate level of the standard between 56 and 65 dB.