Road Roughness Is Measured Using Which Instrument

The work to be executed under this specification consists of collecting data using a laser profiler to.

Road roughness is measured using which instrument.

M922 measurement of roughness rutting and texture by laser profilometer. Pavement texture is divided into. Contact between the instrument and the object being measured e g. The international roughness index iri is the roughness index most commonly obtained from measured longitudinal road profiles it is calculated using a quarter car vehicle math model whose response is accumulated to yield a roughness index with units of slope in mi m km etc.

Since then the iri has become a well recognized standard for the measurement of road roughness. Microtexture with wavelengths from 0 mm to 0 5 millimetres 0 020 in macrotexture with wavelengths from 0 5 millimetres 0 020 in to 50 millimetres 2 0 in and megatexture with wavelengths from 50 millimetres 2 0 in to 500 millimetres 20 in. Different international standards and surface texture or surface finish specifications recommend the use of different roughness filters. Road surface textures are deviations from a planar and smooth surface affecting the vehicle tyre interaction.

A roughness tester shows the measured roughness depth rz as well as the mean roughness value ra in micrometers or microns µm. A measure road roughness data by direct measurement of the longitudinal profile of the road. The iri was developed in 1986 using the results of the international road roughness experiment performed in brazil in 1982. The main advantages of the iri are that it is stable over time and transferable throughout the world.