QUIESST database of European NRD

NRD material types contained in the database

With regard to their material composition the NRD contained in the database represent the European market distribution well: currently most of the available data come from wood-fibre concrete, metallic cassettes and timber barriers, while transparent materials, photovoltaic barriers, added devices and green walls are currently less represented in the database. Although the database includes data from 9 different European countries, a considerable number of NRDs and tests are available for further analysis. The following diagram shows the different materials and barrier types current present in the database, while the Table below explains the abbreviations for materials and barrier types used in the database.

countries
NRD material type Description
SM – Steel supporting structure + Metallic panels Most steel supporting structures have an H-shaped appearance. At least the surface layer consists of metallic material
SC – Steel supporting structure + concrete panels Structure of posts like in SM. At least the surface layer consists of concrete. Wood-fiber concrete barriers can also be assigned to this family
ST – Steel supporting structure + Timber panels Structure of posts like in SM. At least the surface layer consists of timber
SG – Steel supporting structure + Transparent panels Structure of posts like in SM. In most cases the noise barrier consists of only one transparent layer (e.g. acrylic glass)
C – Self-supporting concrete or brick system NRD made of self-supporting construction. An example would be a brick wall
SP – Steel supporting structure + plastic panels Structure of posts like in SM. At least the surface layer consists of plastic material
CT – Tunnel-concrete structure Tunnel structure, which surrounds the entire road to provide full noise screening. May be constructed as self-supporting or with concrete beams supported by concrete pillars
Stu – Tunnel steel structure Tunnel structure, which surrounds the entire road to provide full noise screening. Consists of steel supporting structure and metallic cassettes
GT – Tunnel with transparent panels Tunnel structure, which surrounds the entire road to provide full noise screening. Consists of steel supporting structure and transparent panels
GB – Green barrier NRD type which obtains its acoustic properties from soil with vegetation. A classic example would be a concrete structure with containers, filled with earth and plantings
GA – Gabion with stones NRD made of a gabion framework (solid metallic grid) filled with stones
EB – Earth barrier Artificial or natural earth wall - can be planted or unplanted
PVNB – Photovoltaic noise barrier Usually a conventional noise barrier with added photovoltaic elements