Metrological Traceability Technology for the Pavement Frictional Coefficient Using the Law of Conservation of Energy

Pavement frictional coefficient using the law of conservation of energy is widely used in the evaluation of the pavement in China. To improve the reliability of evaluation, it is in urgent need of building the metrological traceability system of the pavement frictional coefficient. By deeply analyzing the operational principle and definition of Baizhi of the pavement frictional coefficient measuring instrument and considering the economy and portability needs, the project team proposed a two-level-deliver programme of metrological traceability. I level indoor standard is consist of a photoelectric encoder, a force sensors and a sampling control system, etc. II level outdoor standard are lave and textured glass. The results show that the expanded uncertainty of I level standard is 0.42 (k=2), and the uncertainty of II level standard is 0.98 (k=2).The research will be effective support to the pendulum friction tester calibration.