Project carried out with financial support from the Federal Public Service (FPS) Economy, SMEs, Self-Employed and Energy (Contracts CC CCN/PN/NBN-506 and CC CCN/PN/NBN-556 – 1st September 2008 - 1st September 2010)
Raised traffic calming devices (road humps) which are meant to reduce the speed of traffic on public highways to a maximum of 30 km/h have to meet the siting conditions and technical specifications laid down in the royal decree of 3rd May 2002, which has amended a previous royal decree of 9th October 1998. The changes introduced by the new decree consist mainly of tolerances in dimensions.
The object of this test is to determine the mass per unit area of geotextiles, geogrids and related products. The specimens are cut, weighed and measured as specified in standard NBN EN 965 Geotextiles and geotextile-related products – Determination of mass per unit area.
The glass fibre content of glass fibre grids is determined by the calcination method: small specimens of 2 to 20 g are placed in muffle furnace set at 625 °C, leaving only the glass fibre as a residue after heating. A glass fibre content is calculated from the masses of each specimen before and after calcination. The whole procedure is performed according to standard NBN EN ISO 1172, method A.