Study On Design Of Permeable Asphalt Pavement

With the improvement in the intensity of urbanization and the increasing perfection of China's road network,the original natural surface has been replaced by more compacted road surfaces such as cement pavement and marble.It provides convenience for people's daily life with the frequent urban water logging as well as the drastic change of ecological environment and climatic conditions.The structure form of ecological water permeable pavement is different from the structure form of ordinary dense pavement.The ecological water permeable pavement can effectively brings superior ecological benefits to adjust the temperature and humidity of the environment as well as improve the safety of driving.Studying the permeable concrete pavement gradually becomes a key task in the study of sponge urban construction.Therefore,it is necessary to study the permeable concrete pavement.This paper takes the permeable asphalt pavement as the research object to study the design in proportion of the asphalt pavement materials and the structure form of the pavement structure.The content is as follows:(1)Review the existing literature at home and abroad,this paper tries to understand the gradation types of permeable asphalt pavement and the requirements of relevant raw material performance with the asphalt pavement design code as a basis.The data of the rainfall in recent 10 years in Kaifeng City were investigated.According to the highest rainfall and rainfall capacity in each of the past 10 years in Kaifeng City,this paper proposes the data range of the permeable asphalt mixture and the target voidage in Kaifeng.(2)This paper regards basalt fiber as the research object.Basalt fiber is a new environmental-friendly material.It can greatly improve the road performance of permeable asphalt pavement.With the relevant technical regulations of Japan,this paper carries out the leaching test and dispersion test of permeable asphalt mixture with different content of basalt fiber to obtain the optimum amount of asphalt with different basalt fiber content.(3)According to the optimum asphalt mixture with different basalt fiber content,this paper gives road performance texts such as mechanical properties,water stability,water permeability,high temperature stability,low temperature stability,and anti-slip performance for getting the result of the optimal mix proportion design to meet the road performance index of permeable asphalt mixture.It lays the foundation for the application of permeable asphalt pavement in building sponge city.(4)Combining the permeable pavement structures at home and abroad,based on the AC+CRC rigid-flexible composite pavement structure form,this paper proposes the structure form of PAC+CRC rigid-flexible composite permeable pavement,and calculates parameters of each structural layer,finally,establishes a PAC+CRC finite element model of composite pavement structure.With changing the main factors in the thickness,modulus of the PAC layer and the position of the reinforcement layer to analyze the affect of the bearing capacity of the composite permeable pavement structure,this paper proposes the main technical measures to meet the bearing capacity of the permeable pavement structure.