2. The depth of pavement structure is determined by electric sand laying method.
3. Vehicle-mounted laser structural depth meter measures the depth of pavement structure.
4. Measure the friction coefficient of pavement with pendulum instrument.
5. Single wheel lateral force coefficient testing system measures the friction coefficient of pavement.
6. Two-wheel transverse force coefficient testing system measures the friction coefficient of pavement.
7. Dynamic rotating friction coefficient tester is used to measure the friction coefficient of pavement.
All the above methods can be used to detect the anti-skid performance of pavement, and the content comes from the Code for Field Detection of Highway Subgrade Pavement (JTG E60-2008). Asphalt is a dark brown complex mixture, which consists of hydrocarbons with different molecular weights and their nonmetallic derivatives. It is an organic liquid with high viscosity. It is a liquid with a black surface and is soluble in carbon disulfide.
Use of asphalt:
It is mainly used as infrastructure materials, raw materials and fuel, and its application scope is such as transportation (roads, railways, aviation, etc. ), construction, agriculture, hydraulic engineering, industry (extractive industry, manufacturing), civil engineering and other departments. Asphalt materials are divided into two categories: asphalt and tar asphalt. Asphalt is divided into natural asphalt and petroleum asphalt. Natural asphalt is the residue of oil seeping out of the surface after long-term exposure and evaporation. Petroleum asphalt is a product obtained by treating the residual oil in refined petroleum with appropriate technology. Tar asphalt is a reprocessed product of tar, which is obtained by dry distillation of organic matter such as coal and wood. The asphalt used in engineering is mostly petroleum asphalt, which is a mixture of complex hydrocarbons and their nonmetallic derivatives. Usually, the flash point of asphalt is between 240℃ and 330℃, and the ignition point is about 3℃~6℃ higher than the flash point. The construction temperature should be controlled below the flash point.