Evaluation Of Asphalt Pavement Construction Uniformity Based On Infrared Thermal Imaging Technology

Temperature control is a key control element in the construction process of asphalt pavement,which has a great impact on the performance of paved pavement.As a fast and wide-ranging non-destructive testing method,infrared thermal imaging technology greatly improves the efficiency of road surface temperature detection.In this thesis,the infrared thermal imaging by UAV is applied to the construction process of the upper layer of SMA-13 asphalt pavement,which provides a quick and easy way to detect the uniformity of asphalt pavement construction.For temperature detection during the construction of asphalt pavement,most of them use "point temperature measurement" methods such as temperature measuring guns,which are random and do not truly reflect the distribution of the overall temperature of asphalt pavement.In this thesis,the infrared thermal imaging by UAV detection method is used to make up for the defect of the traditional temperature measurement method of "point for surface",which can quickly grasp the temperature distribution of the whole section during the construction process,and then take effective measures for the location of temperature segregation,so that the construction quality of asphalt pavement can be quickly controlled.In order to ensure the temperature measurement accuracy of the infrared thermal imaging by UAV the measurement results under different heights of the asphalt pavement are compared and analyzed to ensure the accuracy of the measurement results at different heights under the condition of ensuring the same ambient temperature,humidity and emissivity.According to the temperature segregation of asphalt mixture gradation type,this thesis takes SMA-13 asphalt mixture as the main research object,and establishes the relationship between porosity difference and temperature difference by studying the temperature change of asphalt mixture during asphalt pavement construction,so as to propose the temperature segregation evaluation index of SMA-13 asphalt mixture based on temperature difference.The dielectric constant of the upper layer of the asphalt pavement and the non-nuclear density meter were determined by the three-dimensional ground penetrating radar total reflection method and the flux rate of the upper layer of the asphalt pavement was determined,the dielectric constant-porosity empirical formula was established,the dielectric constant was determined to evaluate the feasibility of the compaction uniformity of the asphalt pavement,and combined with the temperature data measured by the infrared thermal imaging by UAV,the relationship between the temperature-dielectric constant and the temperature-porosity of the asphalt pavement was established,and the compaction uniformity of the asphalt mixture was evaluated by the temperature after rolling,thereby improving the detection efficiency of the compaction quality of the asphalt pavement.