The fusion degree of new and old asphalt induced by microwave
DONG Miao
SHAN Jingsong
ZHANG Bin
CONG Kai
ZHANG Xinzheng
HAN Weilin
Abstract：To promote the high-quality application of waste asphalt mixtures in recycled asphalt,nano-materials are added to the new and old asphalt mixtures as radar absorbing materials to improve microwave heating efficiency.Based on the difference in fluorescence intensity when the new and old asphalt are excited under a fluorescence microscope,the degree of fusion between the new and old asphalt in recycled asphalt mixture specimens with different absorbent agents(single addition of nano-SiC,single addition of nano-Fe2O3,and composite addition of nano-SiC-nano-Fe2O3,the mass ratio of nano-SiC to nano-Fe2O3 is 1∶2)under microwave induction is observed,and the fusion status of the asphalt is quantified using gray level.The research results show that both single addition of nano-SiC and single addition of nano-Fe2O3 can improve the gray level at the interface of the new and old asphalt in the recycled asphalt mixture specimens.The gray level at the interface of the new and old asphalt after single addition of nano-SiC is better than that after single addition of nano-Fe2O3.After the composite addition of nano-SiC-nano-Fe2O3,the gray level at the interface of the new and old asphalt is superior to that with either absorbent agent alone,with the gray level at the interface of the new and old asphalt in the specimens after the composite addition of nano-SiC-nano-Fe2O3 being 72.14％of the new asphalt.
Keywords：new and old asphalt fusionfluorescence microscopyradar absorbing materialgray scalemicrowave
Publication Date：2025-09-30
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：6( 77-82 )