Asphalt aging mechanism and recycling mechanism are studied in the paper, based on four components tests for aging asphalt and recycling asphalt, by comparing and analyzing the D-value between testing data and theory calculated data. Results show that asphalt four components changes regularly for aging asphalt, which some saturates and aromatics are changed into some asphaltenes and colloid. And the recycling mechanism is not regular for the same asphalt, which the mix result of asphalt four components depends on many factors, such as degree of aging, quantity of old asphalt, components and quantity of recycling agent. The study results can provide important theoretical basis for sustainable use and development of regeneration asphalt.
Due to the use course limitation of asphalt pavement at home and abroad, research on road asphalt recycling is laid particular stress on an aging regeneration properties both in China and abroad at present, and research on multiple aging and regeneration is much less. In this paper, five heating tests of 40 min, 85 min, 180 min, 240 min, 300 min were carried on to simulate asphalt aging , and reentry another same time aging after regeneration for each aging asphalt, so reciprocating cycle five times, each group of sample use the same reclaiming agent to regenerate NO.70# road asphalt after every aging test. The experimental results show that: after aging regeneration many times, performance index of NO.70 road asphalt can return to no age level, namely the asphalt multiple recycling is completely feasible.
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