Laboratory measurements on Poroelastic test slabs from full scale test sections
Invited paper
Danish Road Directorate
Tuesday 2 june, 2015, 16:40 - 17:00
0.2 Berlin (90)
Abstract:
The EU financed PERSUADE project aims at developing poroelastic road surfacing (PERS) with high noise reducing properties. In the summer/autumn 2014 six full scale test sections were constructed, with different material composition or construction technique. The different versions of the PERS are either made as factory produced slabs or as on site constructed road pavements. Test slabs have been produced in moulds at the test sites during construction. The test slabs are produced in order to compare material and construction depending parameters, other than the noise levels from the different surfaces. The laboratory tests performed at the test slabs are: acoustical absorption measured in an impedance tube to describe the acoustic performance of the materials; permeability by Beckers tube method and built in air void by thin-and-plane section analysis, to describe the open structure of the surfaces; mechanical impedance is measured to describe the dynamic stiffness of the elastic material; surface texture is measured to describe the surface which is met by car tyres. On the background of all these measurements the test surfaces are compared, in order to give an evaluation of the noise reducing potential of the tested test slabs. The noise reducing potentials from the tests slabs are compared to CPX measurements at the full scale test sections, whereby the most dominating noise reducing properties of the surfaces are identified.