Effect of aging on group composition of bituminous binders Wpływ starzenia na skład grupowy lepiszczy asfaltowych

Two corn. petroleum bitumens were aged at 163-240 degrees C for 120-360 min and studied for group compn. by elution chromatog. An increase in content of asphaltenes and a decrease in contents of resins as well as arom. and satd. hydrocarbons were obsd. during aging.