Laboratory Investigation of Pavement Performance of Warm Mix Asphalt with Different Addition Methods

Warm Mix Asphalt (WMA) technology is increasingly popular in pavement construction. In the summer of 2012, a field trial project using Sasobit-WMA was established in the Huanhu East Road project, Changzhou city. In line with this trail field project, two addition ways of Sasobit were discussed to evaluate pavement performances in terms of workability, rutting resistance, low-temperature cracking and moisture susceptibility. Results identifies that the Sasobit-WMA has benefits of the workability, rutting resistance over the HMA. Although reduced anti-cracking and water stability performances occurred for the WMA, there is no significant difference between them. For Sasobit addition ways, the dry process has an easier workability and a better anti-rutting performance than those of the wet processes. Compared with the wet processes, the dry process has a slight reduction on anti-cracking and water stability performances. However, these reduction are under the control of specifications and also suitable for pavement construction.