Abstract: FCC slurry has a bad stability at high temperature, resulting in low penetration ratio and poor aging resistance of road asphalt product. The cross-linking condensation process can improve the aging resistance of the slurry, but makes it more dosage for blending asphalt and reduces the economic benefit. The structure of FCC slurry of Luoyang Company before and after aging procedure was determined by FT-IR, 1H-NMR and GPC and then modified with small-molecular aldehyde agent. The research indicated that the slurry is mainly composed of saturated hydrocarbon and aromatics with short side chain; the dehydrogenation-condensation reaction is the main reason for poor aging resistance of slurry. The modification process makes the viscosity of slurry increase slightly and keeps the light components stable after aging, due to lowering the reactivity of aromatics in the slurry through modification reaction.

Key words: FCC slurry, structure characterization, modified reaction, asphalt, aging resistance