Investigation of Rheological Behavior of Asphalt Binder Modified by the Advera (reg) Additive

摘要

Warm mix asphalt (WMA) technologies have attracted great interest in the field of pavement engineering due to its potential energy savings and environmental benefits. As one of the most popular WMA processes, Advera utilizes zeolite to greatly reduce the production temperature of pavement without compromising the performance of the mixture. However, due to the lack of a comprehensive rheological characterization, the existing specifications cannot provide the optimum temperature and additive proportion for specific binder or aggregate types. Unanticipated by the existing engineering practice, the thermal history during material preparation has a significant effect on the end-results of the complex modulus of modified binders. The rheological investigation of asphalt binder modified by the Advera additive: The Advera additive should be mixed with the binder for at least 20 minutes toallow water to be released in order to improve the workability. To effectively form foam within the binder, the lowest temperature for which this WMA technology is intended is 212 degrees F. However, it achieves optimal performance between the temperatures of 230-250 degrees F. Vapors produced from the Advera additive significantly affect the rheological behavior of the modified asphalt binder, particularly at lower frequencies. The effective phase angle does not depict any pattern with increasing temperature.The self-consistent model approach provides a satisfactory prediction of the experimental data at lower temperatures.