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Gray Catastrophe of Asphalt Aging Behavior |
LIU Shengjie |
Highway School, Chang'an University, Xi'an 710064, China |
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Abstract: The changes due to evaporation, oxidation, and polymerization in the internal structure of asphalt and other reactions could change the nature of asphalt and the performance of asphalt mixture, and have influence on the life and durability of the pavement during the storage, transport, mixing, construction, and long-term use of asphalt. In order to study the influences of aging on asphalt performance, the regulation of material physics property change was analyzed. The RTFOT experiment was applied to study on the performance attenuation of 90# asphalt based on the indexes of penetration, ductility, softening point, and viscosity. According to the principle of evaluating system stability with the variable tendency of its compatibility, the catastrophic potential function between asphalt performance and aging time was built based on the test data, and then the destabilization of asphalt aging was predicted by the grey-cusp-catastrophic destabilization prediction model. The research results are shown as follows: the catastrophe of asphalt exits in the aging process; and hysteresis phenomenon exits between catastrophe and aging actions. It is indicated that the catastrophe theory on the asphalt aging is feasible, and is able to predict the rule of asphalt aging more accurately. In order to make the asphalt pavement have the longer services life, the measures should be taken to extend the occurring time of catastrophe.
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Received: 10 February 2012
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