Backcalculating The Compaction Of The Surface Of Asphalt Pavement Based On Improved Dielectric Constant Model

Compaction degree is the quality control of asphalt concrete pavement surface of an important technical indexes. But at present for the asphalt concrete pavement compaction test still rely on such destructive sampling method of artificial got the traditional method, and apparently had not road construction adapt to changing the status quo. Therefore, it is urgent to fast development of asphalt concrete pavement, nondestructive testing technology surface compaction degree.GPR is a new kind of nondestructive testing equipment, and the way of asphalt concrete pavement layer represents the compaction test technology development direction. But the present GPR application in pavement compaction test is mainly related to get through the field experiment, this method of pavement has certain destructive and lack of correlation.Based on the above of asphalt concrete pavement compaction test, the situation of asphalt concrete pavement compaction of inversion. The main research contents and the conclusions are as follows:(1) Based on the experiment on the dielectric constant of classical model. The study of asphalt concrete composite dielectric properties and the degree of compaction and the relationship between the degree of compaction and asphalt mixture asphalt aggregates, in three parts and air volume.(2) Based on the basic principle of electromagnetic wave radar, according to the structure characteristics, the characteristic of complex dielectric in GPR wave propagation models of asphalt concrete pavement, and the corresponding program Calculation results show that the model is reasonable and effective.(3) Based on the established in GPR wave propagation models of asphalt concrete pavement, system identification theory, the study of asphalt concrete pavement of dielectric properties of composite inversion, and according to the pavement compaction and the dielectric constant of the relationship, and puts forward the improved model based on the dielectric constant of asphalt-concrete surface course compaction inversion method, and the corresponding program.(4) Through the experiment, will be based on the improved model of dielectric constant of compaction inversion and classical model inversion and got test results compared, the results showed that this method is of high precision, fast and continuous, no damage, etc.This research for GPR in asphalt concrete pavement compaction test application provides new ideas and feasibility studies.