Research On Construction Uniformity Of Asphalt Pavement Based On 3D Ground Penetrating Radar

The construction uniformity of asphalt pavement has important influence on the quality of pavement construction and road performance.We often use the thickness and density index to evaluate the construction uniformity of the asphalt pavement.In our country,the thickness and density of the asphalt pavement are measured by the core sampling method.This method is simple and intuitive and accurate.Advantage,but it will cause damage to the original road surface and get limited data.Therefore,it is necessary to develop fast,non-destructive,wide coverage and high detection accuracy of asphalt pavement construction uniformity detection technology and evaluation method.Three dimensional ground penetrating radar(GPR)has the characteristics of wide detection range and high detection efficiency.At present,this method is widely used in the field of asphalt pavement thickness detection and pavement structure layer disease investigation.In this paper,the dielectric constant of asphalt pavement is calculated through the common center point method,and it is compared with the dielectric constant obtained by drilling core sampling and amplitude total reflection method.The thickness of the asphalt pavement is calculated according to the common center method,and the uniformity of the thickness of the construction thickness is evaluated from the two aspects of the local thickness average and the local thickness variation coefficient.According to the theory of electromagnetic mixing,a prediction method of asphalt pavement density based on dielectric constant is established,and its reliability and application scope are analyzed.The asphalt pavement is measured by non nuclear densitometer,and the density prediction model is compared and analyzed,and Rayleigh model is selected as the prediction model of asphalt pavement density in this paper.At the same time,through the analysis and evaluation of the average value,the standard deviation,the fine segregation area ratio and the coarse segregation area ratio of the asphalt pavement,the segregation region and the non segregation area are identified,and a set of evaluation method for the uniformity of asphalt pavement construction is established.