Study On Recycling Mechanism And Technical Property Of The Plant Hot Asphalt Mixture

In recent years, the early domestic high-grade highways have successively entered intooverhaul stage. In order to effectively recycle refurbished asphalt waste，and to meet therequirements of environmental protection and low-carbon economy and realizing sustainabledevelopment of intensive social purpose, carrying out the recycling technology of wasteasphalt has significant economic, social and environmental benefits. This paper analyzed theaging mechanism of asphalt, used the Recycled asphalt materials system to study the asphaltRecycling Mechanism and technical property, and also did the research and development ofhot mix asphalt.This paper first systematically analyzed the asphalt aging mechanism, studied thecharacter of recycle asphalt through the indoor simulation aging test, obtained the aging ruleof asphalt in different aging conditions, compared the aging degree of the pavement recyclingasphalt and indoor aging asphalt. Use the component analysis, infrared absorption spectrumanalysis, gel permeation chromatography analysis and other chemical analysis methods toreveal the asphalt aging mechanism.This paper used two species recycling way to research the recycling asphalt RecyclingMechanism, analyzed the recycled asphalt and original asphalt, recycled asphalt agingproperties of physical properties and microscopic structure from the macroscopic angle andmicroscopic angle respectively, studied the anti-aging property of regenerative asphaltsystemically and deeply, this paper puts forward that use the infrared absorption spectrogram,combined with principal component analysis and BP neural network decision to analysisdifferent character of asphalt, the paper also propose use the average molecular weightdistribution to control the quality of the recycled asphalt.Combined with the needs of the physical project, this paper also carried out the test andevaluation of the recycling asphalt mixture character analysis, the author summarizes theregenerative asphalt mix design method. Besides, the paper also analyzed the recycled asphaltmixture grading and volume indexes variation rules with the change of the RAP blending rate,and determine the synthetic gradation under different RAP blending ratio and the determination of the optimum asphalt content.This paper analyzed and evaluated the recycled asphalt mixture road property from thehigh temperature stability, water stability and durability and other aspects through the ruttingtest, Hamburg rutting test, the water immersion Marshall test and freeze-thaw splitting test.The durability of recycled asphalt mixture asphalt pavement property can meet the needs ofasphalt pavement. The flexibility of the recycled asphalt mixture will strengthen with theincreasing recycling agent dosage.