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The modification principle of crumb rubber modified asphalt has always been the key research of engineering technicians.By means of thermogravimetric analysis,infrared spectroscopy,SEM scanning,the effect of physicochemical reactions of 70# asphalt mixed with different quantities(20%,25%,30%,35%,40%)on the mechanism of the swelling of modified asphalt after high temperature treatment was revealed from microscopic angle.