Study On Skid Resistance Mechanism Of Pavement Friction Based On Apparent Texture Characteristics Of Asphalt Pavement

Inadequate pavement skid resistance is the main cause of traffic safety accidents,In order to reduce the loss of life and property caused by traffic accidents,Road engineering scholars mainly study the pavement skid resistance from the perspective of macroscopic and microscopic texture of road surface.With the increase of the number of acute angles of macroscopic texture of road surface,the frictional component F_? of tire-road surface will increase;The more complex the microscopic texture of the rough aggregate of the road surface,the larger the actual contact area and the interface shear strength of the tire-road surface,the increased adhesion force component F_α of the tire-road surface,and the improved pavement skid resistance.At present,there are many research parameters of macro-micro texture,but which have a high correlation with the friction performance of the road surface,there is no rigorous comparison and discussion.In addition to the severity and importance of pavement skid resistance,it is very necessary for practitioners to conduct texture-based skid resistance research.In order to enrich the macroscopic texture and microscopic texture of the pavement,three grading designs are selected,Separately AC,SMA and OGFC.The basalt,limestone and granite are selected for the coarse aggregate in bituminous mixture.The Marshall test is used to determine the amount of mixture gradation and asphaltFirstly,summarize the research status of road surface texture domestic and overseas,and the macroscopic and microscopic texture parameters closely related to the pavement skid resistance are selected.Next,the sanding method and laser profilometer are used to analyze the apparent texture of various types of road interviews.The test was performed to analyze the repeatability and reproducibility of the test results,and the application range of the above test methods was evaluated.Secondly,considering that the current test method for the friction coefficient of indoor pavement materials is too simple,it is impossible to evaluate the friction coefficient of the surface of the pavement material tested indoors under the multi-factor coupling of vehicle load,driving speed and tire slip ratio.At present,the research team’s independent research and development equipment-Dynamic Friction Testing System for Tire-Pavement is optimized,and based on the slip rate-friction coefficient curve,the effectiveness of the equipment is verified,and the correlation with the pendulum friction test results is completed.analysis.Next,the Dynamic Friction Testing System for Tire-Pavement is used to further study the factors affecting the anti-sliding performance of asphalt pavement under various variable conditions such as upper load,vehicle speed,tire slip ratio,asphalt mixture gradation.Combined with the macroscopic and microscopic texture parameters of the road interview,the correlation analysis between road surface texture and asphalt pavement anti-sliding performance is carried out.MTD,MPD,R_q and R_α have a significant influence on the pavement skid resistance,and have a good correlation with the friction coefficient of the asphalt pavement.