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Abstract
Since warm asphalt technology is relatively new, there are no old pavements to study the ageing behaviour of warm mix asphalt (WMA). While several studies have been conducted to study the properties of WMA, its ageing characteristics are yet to be evaluated in detail. This paper presents the results of a laboratory study conducted to evaluate the ageing characteristics of WMA. Laboratory-prepared samples were aged artificially in the oven to simulate long-term ageing and then compared with unaged samples. Results of this study indicate that the warm asphalt additives improved the moisture susceptibility of the mixes and the mixes containing Sasobit® exhibited lowered rutting. Also, Aspha-min® lowered the resilient modulus (M R) values of the mixes at 25 and 40°C. The additives did not seem to have any significant effect on the moisture susceptibility or the rutting resistance of the mixes as they aged, but significantly increased the M R values of the mixes as they aged.