Asphalt Concrete Pavement Segregation Detection And Prevention Measures

Pavement segregation is the main factor that results in incipient creak of bituminous concrete pavements. Presently, the segregation test and estimation of bituminous concrete pavements in China mainly rely on traditional methods as visual identification, sand patch testing and coring. But all these test methods can not satisfy the requirements of the rapid development of highway construction due to their slow test speed, strong subjectivity, probable error, and destructivity to pavements. Therefore, it is in urgent need to find a rapid, continuous and nondestructive segregation test technology of bituminous concrete pavements.Ground-Penetrating Radar, as a rapid, high efficient and nondestructive test equipment, has played more and more important role in the indexes capability test of pavement. It represents the present development direction of test technology as regards important indexes including thickness, compaction, segregation, water content and so on. Infrared Imaging, as an advanced infrared temperature-measuring device, is able to measure the temperature accurately and has attracted widely attention from the aspect of segregation test of bituminous pavement.Experimental researches were carried out against segregation test technology problems of bituminous concrete pavements by using Ground-Penetrating Radar to test aggregate segregation of asphalt mix and Infrared Imaging to test temperature segregation. Besides, effective prevention measures against segregation were also researched in this paper. The main research results and conclusions include as follows:1. Significant findings and results from the experimental researches regarding the aggregate segregation test of asphalt mix by using Ground-Penetrating Radar are as follows: the mutual relationship between the dielectric, density, percent air void and asphalt content of bituminous mixture and the correlation between density and the surface texture depth; The criterion for determining bituminous mix segregation by GPR is obtained through the analysis of mutual relationship between the...