Study On The Decay Law Of Asphalt Pavement Performance In The North Of Hebei Province

After large-scale highway construction,the mileage of highways in China has basically met the needs of economic development.The main task of highway traffic development has shifted from the era of construction to the era of conservation.The north of Hebei Province belongs to the cold region of our country,with the features of low temperature,long duration of low temperature,large temperature difference and complicated geological conditions.Due to the harsh environment of the road,the highway pavement structure is easy to produce different types and different degrees of damage,and the service performance is declining year by year.By studying the law of decay of pavement performance,when the performance of the road surface is reduced to a certain level,appropriate measures for conservation or reconstruction can be taken in time to improve pavement performance and prolong service life.Therefore,it is very necessary to study the decay law of service performance of asphalt pavement in the highway in the north of Hebei Province.Based on the actual situation of the highway in the north of Hebei Province,this paper mainly studies the following aspects:(1)Based on the statistics of disease data in a number of the highway in the north of Hebei Province,the main types of diseases are identified and the causes of the diseases are analyzed to provide theoretical guidance for the prevention and treatment of road diseases.(2)The gray relational degree theory is used to analyze the use performance index to determine the relationship between the comprehensive index of performance and the gray relational degree of each item index.According to the changes of various indicators of highway performance over the years,determine the decisive indicators of highway asphalt pavement evaluation in the north of Hebei Province(3)The time series analysis method was introduced to calculate the rut depth of the pavement before and after conservation.Through regression analysis,the rutting prediction model for the asphalt pavement of the highway in the north of Hebei Province before and after conservation was obtained.(4)The SPSS software is used to carry out regression analysis and error analysis on the measured PCI data of a number of expressways in northern Hebei Province.Finally,the S model is selected as the prediction model of the road damage condition,and the function formula of ? and k in the S model is proposed.(5)The mechanism of anti-skid performance of asphalt pavement is analyzed.The basic theory of gray GM(1,1)model is introduced.The anti-skid performance of highway in northern Hebei Province is checked.(6)The established model is used to determine the service life of the actual highway cover surface in the north of Hebei Province.