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In this work, the acoustic performance of building elements including natural sustainable fibrousmaterials is evaluated. The physical parameters of the considered biobased fibrous material s havebeen characterized in CEREMA laboratory; these characteristics at the material level are mainlyobtained from Kundt tube measurements, following the three microphones method. Theseparameters can then be injected into a prediction software in order to predict the acousticperformance of a building element. In the present case, the CSTB software AcouSYS based on atransfer matrix approach and integrating a spatial filtering method to take into account the finite sizeof building systems and a coupling with a SEA approach to take into account structural paths, ismainly used.Several types of biobased materials are considered, as for example flax and hemp wools. Differenttypes of boards are also taken into account. Wood and metallic frame are as well evaluated withregards to the final acoustic performance.The acoustic performance of building elements including biobased fibrous materials are comparedto similar ones including more standardly used material such as mineral wool. Measurement resultsevaluated in a laboratory are also compared to those predicted. The effect of the biobased fibrousmaterials characteristics variability is finally discussed. |
