Study On Asphalt Mixture Segregation Under Loading And Unloading Process

Asphalt pavement is the main form of our country highway pavement structure, asphalt mixture in the whole construction process of the creation of segregation, easy to make the pavement diseases early damage phenomenon, greatly shorten the service life of the asphalt road surface. So know mixture segregation and surface segregation, the relationship between the study of bitumen mixture segregation in the construction process, put forward the corresponding measures to reduce the segregation, to reduce the early diseases of asphalt pavement and improve the quality of pavement has important significance.Analyses the forming mechanism of mixture of various types of segregation and the pavement diseases early failure mechanism, and analysis on the advantages and disadvantages of the various pavement segregation detection method. Aggregate segregation in the asphalt pavement are emphatically analyzed the reasons of the production process each link, and proposed the corresponding control measures to reduce the segregation.Mixture in the process of loading and unloading of vertical displacement is larger, easy to produce serious aggregate segregation phenomenon, so we chose the mixture segregation charging and discharging process do research, through the study of the different color dyeing of aggregate and glue instead of asphalt, aggregate with dyeing and glue mixing instead of hot mix asphalt mixture at room temperature, indoor simulation with homemade loading and unloading process, using image processing technology to test the cross section image processing,Variance with grid method to calculate the overall uniformity of mixture, using uniformity as evaluation index of mixture segregation, namely the mixture uniformity is smaller, the more serious the aggregate segregation.Test studies the relationship between the level of matching the effect of segregation, loading test truck carriage at the bottom of the structure of segregation, the influence of unloading test truck carriage rises the influence of different Angle of segregation, through the experiment of image processing and data statistics, the same test process of mixture levels of segregation AC-20>AC-13>SMA-13, at the bottom of the car and in the process of loading experiments on both sides of the baffle can reduce mixture segregation and discharge experiments transporter rise Angle, the greater the mixture, the blanking, in the form of whole carriage on the lower aggregate relative motion is small, more uniform segregation more mixture.