Research on the Evaluation Method of Asphalt Mixture Uniformity Based on Shape-Centre Method

Abstract

In order to control the quality of the project and reduce the impact of asphalt pavement segregation on the early road service life, this paper investigates the asphalt mix paving uniformity. First of all, based on the theory of form-centered method, the article proposes an evaluation method using weighted form-centered distance coefficient of variation to evaluate the uniformity of asphalt mixture. Then, a series of operations such as preprocessing and image segmentation were performed based on digital image technology on the image data collected from the pavement construction site, and the data calculation results of HT, an evaluation index of asphalt mixture uniformity, were obtained. Finally, the construction depth ratio evaluation index was corrected, and the link between the asphalt mixture paving uniformity evaluation index HT and the construction depth correction value XTD was studied based on the field test and correlation analysis. The results surface, using image processing method and form-centered evaluation theory to obtain the weighted form-centered coefficient of variation HT and the corrected value of constructive depth have a significant correlation, when the coefficient of variation of uniformity HT is in the range of 0.307~2.143, it can be considered that the asphalt mixture in this area does not segregate, and the ranges of mild segregation and moderate segregation are 2.1431~4.026 and 4.026~6.460, respectively. When the weighted form-center distance coefficient of variation HT is greater than 6.460, it can be considered that the asphalt mixture in the detection area has produced heavy segregation; this study is of great significance for ensuring road construction quality and improving pavement construction technology.