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The research on sound absorption coefficients of road surfaces on the test section in
Bolimów and in laboratory conditions was carried out within the framework of the research project
RID—I/76, Protection against Road Noise, realized within the Development of Road Innovations
program by the consortium of Krakow University of Technology, Warsaw University of Technology,
Wrocław University of Technology, Road and Bridge Research Institute, and Lublin University of
Technology, commissioned by General Directorate for National Roads and Motorways (GDDKiA) and
National Centre for Research and Development (NCBiR). The study was supported by ILT discipline
subvention No FD-20/IL-4/012 and No FD-20/IL-4/027.
Current literature on the performance characteristics of road surfaces is primarily focused on evenness, roughness and technical durability. However, other important surface properties require analysis, including noisiness, which is an important feature of the environmental impact of vehicular traffic around roads. This can be studied using various methods by which road noise phenomena are investigated. The method used to measure the noise performance of road surfaces herein is the Statistical Pass-By (SPB) method, as described in ISO 11819-1:1997. The impedance tube method was used for sound absorption testing, as described in ISO 13472-2:2010. These tests were performed under a variety of conditions: in situ and in laboratory. The existence of relationships between them can be helpful in selecting surfaces for noise reduction. Preliminary surface noise tests can be performed in the laboratory with samples consisting of various compounds. This is less expensive and faster than doing so on purpose-built surfaces. The paper presents study results for sound absorption coefficients of various types of low-noise surfaces in in situ conditions (on an experimental section and on operated road sections) and in the laboratory setting. The results of the tests performed on the operational sections were compared to the results of the surface impact on road noise using the SPB method. The correlations between the test results help confirm the feasibility of road surface pretesting in the laboratory and the relation to tests performed using the SPB method under typical operating conditions.
