Abstract
Literature shows that microwave conditioning has been used to age bitumen. There has been less research using microwaves to accelerate the aging of asphalt mixtures. This paper considers the use of microwave heating as a means of rapidly aging gyratory prepared test specimens. Indirect Tensile Stiffness Modulus, assessed using the Nottingham Asphalt Tester was used to assess its affect. It was found that microwave conditioning had a significant effect on retained stiffness. Although the asphalt mixture test specimens went through a cycle of recovery after initial microwave heating, there was a longer term reduction in retained stiffness. This suggests that microwave heating of compacted asphalt mixture test specimens may be a simple and rapid way to accelerate the aging of asphalt mixtures. The proposed test is still in its early stages of development and the study reported in this paper is still inconclusive.
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