Effect of field aging on adhesive properties of warm-mix asphalt

Increasing demand towards environmental awareness and sustainable development has lead the construction industry to develop technologies that have less negative impact to the environment. Accordingly, Warm Mix Asphalt (WMA) is one technology that found to have potential in minimizing the bad environmental impact in road construction activities. It’s low mixing and compacting temperature has open a great opportunities toward more sustainable development. However, during its service life, asphalt viscoelastic properties will gradually change and become more brittle which will reduce its adhesion properties with aggregate. Thus, the objective of this study will focus on investigating the effect of aggregate type and asphalt binder field aging on the binder-aggregate interfacial characteristic of WMA by evaluating its surface free energy and adhesive bond strength. Type aggregate found to have significant impact on the work of adhesion. Both sessile drop and pull-off testing result in different aggregate type of superior aggregate in term of work of adhesion. Asphalt binder field aging also play a significant role in asphalt-aggregate bond energy, with average reduction of 3% in a month compare to unaged materials.