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Correlation between post and element measurements of in-situ sound insulation for concrete barriers

The diagram shows the comparison between sound insulation measurements performed in front of a post and measurements performed in front of a noise barrier element for concrete barriers only. The frequency range considered is from 200Hz to 5kHz. The formula of the linear regression is also shown in the diagram. Due to the relatively small number of cases for which results for post and element of the same barrier were available the linear regression cannot represent a robust relation for each barrier material separately. To establish such a relation more data would be needed. However a general trend can be recognised.