Study On Influence Of Contaminants On Anti-sliding Performance Of AC-13 Asphalt Pavement

Driving safety is important in the automotive industry and transportation systems.The safety problem of the vehicle during driving is most closely related to the anti-sliding performance of the road.Good anti-sliding performance is the guarantee for safe and fast driving of the vehicle,and it is the most basic requirement for the road surface.In the case of open traffic,the anti-sliding performance of asphalt pavement is mainly affected by rainfall conditions,ambient temperature and road surface pollutants.In this paper,the influence factors of pollutants on the anti-sliding performance of asphalt pavement under dry and wet(rainfall)conditions are studied.Based on the analysis of the actual pavement contaminant composition,according to the screening results,five different particle size contaminants were selected as typical contaminants.The AC-13 asphalt pavement was selected and tested by T2 GO continuous friction coefficient.The instrument studied the effects of five types of contaminants on the anti-sliding performance of asphalt pavement at five concentrations,and considered the coupling effect of rainwater during rainfall,and comprehensively evaluated the effect of contaminants on the anti-sliding performance of asphalt pavement.Through SPSS multi-factor analysis of variance,the order of influence of 3 factors and 5 levels was obtained.In this paper,the HandySCAN 3D? portable 3D scanner was used to obtain the pavement texture data under different conditions and the 3D texture parameters were calculated by the MountainsMap software.The height parameters,characteristic parameters and volume parameters of the contaminants were analyzed and the relationship between the friction coefficient and pavement texture parameters is established,which provides a new idea for studying the change of pavement texture during the process of contaminants impacting on road surface.Through research,it is found that,in the case of dryness,the friction coefficient of the road surface gradually decreases with the increase of the contaminant concentration regardless of the contaminant.When the filling rate calculated by the construction depth reaches 100%,the friction coefficient of dust and sand is reduced by 29% and 43%,respectively,and the friction coefficient of sand,gravel and stone is reduced by 52%~56%.During the rainfall cycle,different contaminants gradually decreased and then rebounded and differentiated with the increase of water concentration.The smaller the particle size of the contaminants,the more obvious the rebound,and the friction coefficient of 10% of the dust rebounded most obviously.The multi-factor influence degree is ranked as contaminant concentration > water concentration > contaminant type > contaminant concentration * water concentration.In the case of dryness,the correlation between the height parameter Sq and the friction coefficient is good.When the contaminants are wet,the height parameter Sq,the volume parameter Vvv and the friction coefficient are positively correlated,but the Pearson coefficient is generally low.The characteristic parameters Spd and Spc are effective in evaluating the phenomenon that the road surface friction coefficient rebounds at a later stage during simulated rainfall.