Dependence between Reduction of Weighted Impact Sound Pressure Level and Specimen Size of Floating Floor Construction

摘要

The aim of the research was to evaluate an influence of floating floor construction specimen size on weighted reduction in impact sound pressure level ΔLW. The large size (area ≥ 10?m2) specimens should be used according to LST EN ISO 10140 series standards. The problem is that produce large specimens is expensive and time-consuming process. So more rapid and cheaper way is to use smaller size (area 10?m2) specimens and perform measurements in real buildings with similar test conditions as in laboratory. For evaluation of the specimen size influence on reduction in impact sound pressure level ΔLW value sand/cement screed area discreetly was reduced from 13.4?m2 down to 0.5?m2. The test results showed strong dependence of reduction in weighted impact sound pressure level from specimen size. Relying on the test data it was derived relationship which could be applied for the correction of the determined ΔLW values when smaller size specimens (area 10?m2) of floating floor constructions are used.