SBS Modified Asphalt Concrete Material Composite Dielectric Property Model Research

The ground penetrating radar(GPR)has become an important component of non-destructive testing for road due to it is fast,nondestructive and high efficiency.GPR is representing the current direction of development of measurement for road quality,such as compaction,water content and asphalt content.SBS modified asphalt concrete materials because of its unique superiority in the highway construction of our country has been widely used,which has become an irreversible trend,based on GPR for of SBS modified asphalt concrete compaction degree and asphalt content index of quick and nondestructive detection has become a top priority.SBS modified asphalt concrete material dielectric constant model is based on the foundation and the key of the ground penetrating radar study of asphalt pavement compaction degree and asphalt content index.However,the domestic and foreign research on asphalt concrete material model of dielectric constant of less,for SBS modified asphalt mix of concrete material dielectric constant is blank.In view of this situation,under the support of National Natural Science Foundation of China,this paper studies the SBS modified asphalt concrete composite dielectric constant model,the main research contents are as follows:1)The dielectric properties of the basic theory is discussed,and introduced the methods of network analyser to measure the dielectric constant of the,the combination of SBS modified asphalt concrete in the object of study,innovation the waveguide method for measuring the test test piece of dielectric constant;2)Through the test,analysis of the factors of asphalt aggregate ratio,frequency,phase volume fraction of SBS modified effect of the complex permittivity of asphalt concrete,the model of the dielectric properties of this paper provide the basis for the establishment of;3)Research team in the early establishment of asphalt mixture dielectric characteristic model,based on test to determine the model parameters,and innovation of introduced that frequency is an important parameter,establish taking full account of the real,virtual and test frequency of SBS change of asphalt concrete composite dielectric characteristic model;4)Based on the experimental results,the accuracy of the model is tested by comparing with the existing common root mean square model,linear model and Rayleigh model;5)Combined with practical engineering,the establishment of SBS modified asphalt concrete composite dielectric characteristic model based on,the compaction of the asphalt concrete pavement using particle swarm algorithm for the inversion of SBS modified degree,void ratio and other indicators,further validate the established model is reasonable.To achieve to provide important theoretical basis for the nondestructive testing of the performance index of ground penetrating radar on SBS modified asphalt concrete pavement compaction degree,void fraction based on taking full account of the real,virtual and test frequency of SBS changed asphalt concrete composite dielectric characteristic model with high accuracy is established in this paper.