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Description
ISO 9052-1, currently under revision, defines the test method for determining the dynamic stiffness of resilient materials used under floating floors, a key parameter for assessing acoustic performance. However, it does not account for the evolution of this property over time. Material ageing leads to a gradual increase in dynamic stiffness, resulting in a decrease in impact sound insulation, which may reach 1 dB after one year and up to 4 dB after ten years.In this context, the present study investigates a method for evaluating the long-term creep of dynamic stiffness, based on an adaptation of EN ISO 16534, originally developed for compressive creep. To this end, a long-term experimental campaign, initiated in March 2021, monitored the evolution of dynamic stiffness for several floating screed underlays over a five-year period. The results are analysed to assess the relevance of this methodology for characterising and extrapolating the creep behaviour of dynamic stiffness.