Research On Quantitative Evaluation Method And Real-time Detection System Of Temperature Segregation Based On Infrared Image

Temperature segregation is an important factor affecting the construction quality of asphalt pavement,and it is also one of the reasons for inducing early pavement diseases on the pavement.This article explains the causes of temperature segregation from the perspective of asphalt pavement materials and construction.Based on the reasons for temperature segregation,measures to prevent temperature segregation are proposed from three aspects: material selection,construction management and construction technology.Then it introduces two common temperature segregation detection methods,point thermometer and infrared thermal imaging,and explains the advantages of infrared thermal imaging technology and the infrared equipment used in this article.By analyzing the rationality of the NCAT temperature segregation evaluation standard based on infrared thermal imaging,it is pointed out that the traditional NCAT standard only considers the temperature difference of the road surface and ignores the temperature of the road surface.It is difficult to directly correlate with the final construction quality and road performance.And it is verified that the size of the road surface taken by infrared thermal imaging will have a great impact on the results of the NCAT temperature segregation evaluation standard,so the NCAT standard is difficult to adapt to the temperature segregation in actual construction.In order to establish a new evaluation method for temperature segregation,this paper proposes two factors influencing the temperature range and the area of the low temperature area based on the temperature difference of the road surface based on the temperature distribution of the road surface during the initial pressure during construction.In view of the factors affecting the temperature range,three asphalt mixtures,AC-13,AC-16,and AC-20,are used to test the changes in volume parameters,high-temperature rutting resistance,low-temperature crack resistance,and water stability at different molding temperatures.Research,and then combine the volume and performance changes of the mixture at different molding temperatures and the comprehensive analysis of the construction quality changes at different initial pressure temperatures in actual construction,and obtain the temperature zone influence coefficient TIC of different temperature intervals based on the best compaction temperature of the mixture;Influencing factors of the area of the low temperature area,through the simulation analysis of the force and deformation of the low temperature area of different sizes,it is concluded that as the area s of the low temperature area increases,the deformation increment DI(s)of the low temperature area increases in the form of a piecewise logarithmic function,And thus transform into the low-temperature area influence coefficient δ.Combining the temperature zone influence coefficient TIC and the low temperature area influence coefficient δ,a temperature segregation model(Temperature Segregation Status Index TSSI)based on two factors affecting the temperature range and the area of the low temperature zone is constructed.The feasibility is verified by three variables of different temperature zones,low temperature zone area,and number of low temperature blocks.Finally,this article uses infrared image digital processing technology to obtain five road temperature indicators including TSSI value,maximum temperature,minimum temperature,temperature difference,and average temperature through infrared image segmentation and quantitative calculation.And based on the five temperature indicators as the core data,combined with the application requirements of the project,a real-time detection system for temperature segregation at the mobile terminal was built to realize the real-time rapid detection and monitoring of the temperature segregation of the road surface during construction.