Analysis on texture characteristics of positive texture skid-resistance friction course based on discrete element
A discrete element model of spreading positive texture skid-resistant friction course was established based on the PFC3D discrete element software.The feasibility of texture research based on the discrete element model was verified by comparing the texture characteristics of the discrete element model of friction course with those of the specimen prepared in the laboratory.The effects of the parameters such as the mix mass ratio and the compaction times on the surface texture of the friction course were analyzed.The results show that the texture skewness and the mean profile depth firstly decrease and then increase with the increase of the mass ra-tio of coarse aggregate,while decrease with the increase of the oil-aggregate mass ratio.The influence of the nominal maximum aggregate size is the most significant.When the nominal maximum aggregate size is 4.75 mm,the friction course has higher positive texture level and better skid resistance.Therefore,it is recommen-ded to use this size of aggregate in the construction practice.With the increase of the compaction times,the decreasing trends of both the texture skewness and the mean profile depth become gradually moderate.After 7 times of compaction,the indexes basically approach stable.
road engineeringpositive texture friction coursediscrete element modelpavement skid-resistancetexture characteristics
万方数据
维普
