Abstract
The warm recycling technique has been increasingly used due to its advantages of environmental protection and high reclaimed asphalt pavement (RAP) utilization ratio. In this study, the linear viscoelastic (LVE) properties of warm-mix recycled asphalt binder, mastic, and fine aggregate matrix were measured by the dynamic shear rheometer (DSR) temperature and frequency sweep test. Effects of aging levels and recycling plans on the master curves of complex shear modulus |G∗| and phase angle δ as well as corresponding pavement performance parameters were evaluated by statistical methods. Pavement performance correlations among different material scales were investigated. It is found that magnitudes and master curve shapes of the |G∗| and δ vary with material length scales. The secondary aging behavior causes the improvement of the rutting resistance property and the reduction of the fatigue and low temperature cracking resistance property. Unlike the aging effect, using the WMA technique leads to opposite results. By comparison, using the SBR latex can improve all aspects of the pavement performance. The potential critical material characteristic scales for evaluating different pavement performance are finally determined.
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