Predicted Model of Asphalt Pavement Non-Segregated Zone

Asphalt pavement homogeneity problem is the focus of research in the world at present. Segregation of asphalt pavement is defined as a magnitude lack of homogeneity of constituents in the HMA pavements, it is one of the important reasons that greatly influence pavement performance, and it will accelerate the pavement distresses, especially the moisture damage. At present, under the conditions that the evaluation method and evaluation index of segregation are lacked in China, hitherto the evaluation criterion and the predicted models of homogeneity zones aren't be provided. In this study, portable laser surface texture was used in texture depth testing to evaluate homogeneity of asphalt pavement. The common model of homogeneity zones with three traditional Chinese gradations (AC-25, AC-20, and AK-16) was established by collecting and analyzing magnitude datum of in-place mat. The comparison analysis between predicted model and in-place mat showed good correlation whose coefficient is 0.86. Then the ratio of actual value in-situ to calculation value from predicted model was used to evaluate the homogeneity of asphalt pavement. The homogeneity levels were graded to evaluate the extent of pavement surface segregation. The results show that the predicted model can effectively simulate the real pavements homogeneity status, and the evaluation criterion can be used to determine homogeneity level of in-situ.