Abstract
Gussasphalt has been widely used in steel bridge deck and pavement in China, but it will lead to the pyrolysis aging of gussasphalt binder in the mixing process due to the high temperature and longtime mixing. The effect of improving the aging performance of Gussasphalt was studied by adding warm-mixed agent after superheat aging, and the aging performance between the matrix asphalt and the gussasphalt modified with Sasobit and RH were compared and analyzed. The results show that: RH warm-mixed agent has little effect on the penetration of Gussasphalt binder, while Sasobit warm-mixed agent has more influence on the penetration of Gussasphalt binder. Gussasphalt binder with of 2% RH warm-mixed agent or 1% Sasobit warm-mixed agent is the optimum mix dosage. The adding of 2% RH warm-mixed agent or 1% Sasobit warm-mixed agent can effectively decrease the mixing temperature of the mixture, and Sasobit’s effect is better.
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