These have been tender mixes that should endure mix pushing and shoving under the roller, without which it can't be rolled properly. To information the contractors for asphalt mixing and to know the temperature of compaction, no bitumen viscosity is on the market. The penetration check involves penetration of a needle that's loaded by 100g, into bitumen seller a bitumen sample maintained at a temperature of 25-diploma Celsius in a water tub for a period of 5 seconds. To have correct mixing and compaction temperatures for asphalt mixtures, it is essential to search out the stiffness of bitumen. Here the stiffness in terms of kinetic viscosity should be decided.