Research and Verification of Asphalt Pavement Thickness Based on 3D Ground Penetrating Radar
In pavement quality monitoring,the thickness of asphalt pavement has always been a crucial parameter that directly impacts road quality,road lifespan,and road traffic safety.Although the traditional core drilling sampling method is widely used,it has a significant drawback in that it causes irreversible damage to the pavement,potentially requiring additional repair work and expenses.Moreover,the limited and intermittent samples obtained cannot adequately represent the overall quality level.To address this issue and seek a more efficient,accurate,continuous,and large-scale measurement method,this paper investigates three methods and principles for detecting asphalt pavement thickness using three-dimensional ground penetrating radar:core drilling sampling,amplitude full reflection,and co-centered point methods.Through engineering examples,the accuracy of core drilling sampling,amplitude full reflection,and co-centered point methods in measuring asphalt pavement thickness is assessed.The results indicate that the average errors for core drilling sampling,amplitude full reflection,and co-centered point methods were 22%,138%and 25%,respectively.The co-centered point method achieves a measurement accuracy comparable to that of core drilling sampling and exhibits a lower coefficient of variation in error measurement compared to the amplitude full reflection method.