Asphalt Pavement Smart Aggregate Design And Performance Research

The compaction degree of asphalt mixture is an important evaluation index of asphalt pavement construction quality.The compaction quality directly affects the strength,stability and durability of asphalt pavement.The inhomogeneity of asphalt mixture is an important factor affecting the compaction quality of pavement.The temperature inhomogeneity refers to the temperature segregation of asphalt mixture caused by heat loss during construction.The collection and control of mixture temperature during asphalt pavement construction is particularly important to ensure the construction quality of asphalt pavement.In order to solve the problems of low temperature acquisition frequency and poor accuracy of asphalt mixture during construction,this paper designs an intelligent aggregate of asphalt pavement based on temperature sensor based on the existing research ideas and packaging technology of smart aggregate,so as to realize the continuous collection of internal temperature of mixture during construction and assist on-site construction.Firstly,a set of internal temperature acquisition system for asphalt mixture during the construction of asphalt pavement is established by using high-temperature resistant battery as the smart aggregate power supply of asphalt pavement,high-precision temperature sensor as the temperature sensing module,Bluetooth SOC,radio frequency transceiver and receiving end software as the transmission module,so as to realize the continuous collection of internal temperature information of asphalt mixture,efficient data transfer and wireless transmission.Then,a new composite material with high temperature resistance was selected as the smart aggregate packaging material for asphalt pavement.The optimum mass ratio of each component of the packaging material was explored by orthogonal test,and the strength of the packaging material was tested.According to the test results,the packaging material has good strength characteristics at room temperature,the strength decreases slightly at high temperature,and the strength increases significantly after high temperature,which meets the strength requirements of smart aggregate packaging in high temperature environment.Through the finite element analysis method,the stress and strain of the smart aggregate of asphalt pavement under the condition of rolling construction are simulated.According to the simulation analysis results,the tetrakaidecahedron shape is preferred as the packaging shape of the smart aggregate.With the help of 3D printing technology,the packaging mold was made,and the smart aggregate packaging sample was made and the packaging strength test was completed,which verified that the smart aggregate packaging can effectively protect the internal components.Finally,the signal coverage ability and endurance ability of smart aggregate of asphalt pavement were tested.The results show that temperature is the main factor affecting the signal coverage of smart aggregate.The higher the data reading frequency,the shorter the life time of smart aggregate.In addition,the temperature correction function of smart aggregate of asphalt pavement is fitted by data analysis,which greatly improves the accuracy of smart aggregate temperature data.The performance of asphalt pavement smart aggregate was tested by indoor test to simulate the construction conditions,and the effectiveness of asphalt pavement smart aggregate was verified to meet the internal temperature monitoring requirements of asphalt mixture during construction.The smart aggregate of asphalt pavement can effectively improve the collection frequency and accuracy of the internal temperature of the mixture during the construction process,which provides a new idea for the internal temperature monitoring of asphalt mixture.