Research On Asphalt Pavement Construction Quality Evaluation And Control Based On Three-dimensional Ground Penetrating Radar

Asphalt pavement is the main form of high-grade highways in China.Strengthening construction quality control is of great significance to prolong the service life of asphalt pavement and prevent early damage.As a non-destructive,fast,and full-coverage detection and evaluation method,3D ground penetrating radar can realize rapid detection and scientific evaluation of the thickness and dielectric constant uniformity of new road asphalt layers.Many researches have been carried out at home and abroad based on three-dimensional ground penetrating radar to obtain the detection results of asphalt pavement thickness and dielectric constant,but further research is needed on how to strengthen the evaluation and control of asphalt pavement construction quality based on test results.Based on the existing research results,this paper carried out an accurate description and evaluation of the thickness and uniformity of asphalt pavement based on the detection results of 3D ground penetrating radar,and dynamically adjusted the construction plan according to the results of each paragraph to improve the asphalt pavement thickness and porosity uniform distribution,strengthen the evaluation and control of asphalt pavement construction quality.The first chapter elaborates the background and overview of the application research on the evaluation and control of asphalt pavement construction quality based on three-dimensional ground penetrating radar,summarizes the deficiencies in the previous research,and proposes the technical research route and main work arrangement of this paper.The second chapter describes the characteristics and principles of electromagnetic wave propagation,system composition and operation mechanism,electromagnetic wave emission method and optimal parameter combination determination method,and the principles of conversion,presentation and processing of electromagnetic signals.Chapter Three summarizes the 3D ground penetrating radar full-section coverage detection method for the thickness of the asphalt layer,and based on the 3D ground penetrating radar thickness detection results,a pavement thickness compensation method is proposed to dynamically adjust the thickness of the asphalt pavement to guide the subsequent upper bearing layer construction.The application of this method in solid engineering shows that the pass rate of asphalt pavement with a pass rate of thickness below 95% can be increased to over 98%,effectively increasing the pass rate of pavement construction thickness and improving uniformity.Chapter four summarizes the three-dimensional ground penetrating radar dielectric constant detection method,based on the three-dimensional ground penetrating radar dielectric constant detection results,calculates the distribution coefficient of each unit,characterizes the degree of deviation of each unit from the data,and proposes a trend analysis of the dielectric constant distribution of the asphalt layer Method,and determine the area where the risk of segregation exists according to the inspection threshold,and take timely treatment measures.Chapter five is based on the regional characteristics of asphalt pavement construction quality distribution,combined with the regional correlation analysis method in digital images,introducing the concepts of connected variation area,regional convex hull,etc.,calculating the area,variation rate and other indicators.The analysis method for predicting the coarse segregation degree of asphalt pavement area by the area indexes of the cladding area and convex hull variability rate.The significance level of model F test is 0.33%.The model has good reliability.