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Description
Elastically bound granular chippings are widely used in cross-laminated timber (CLT) floor constructions to improve the impact sound insulation of the construction. Although laboratory measurements often demonstrate very low normalized impact sound pressure levels for such systems, significant variability has been observed in practice. In the present study the impact sound pressure measurements of different chipping types in small-scale tests are shown. Various parameters – including impact sound insulation, type of chippings, filling height, and binding agents – are investigated. The results are presented in terms of impact sound reduction in order to more clearly identify frequency ranges of improvement and deterioration, enabling robust conclusions to be drawn. The material properties of the different heavy fillings and binding mechanisms were also investigated and are shown in the second part of this paper.