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| Dynamic viscoelastic property of recycled modified asphalt mixture |
| Key Laboratory of Road Structure & Material(Beijing), Research Institute of Highway of Ministry of Transport, Beijing 100088, China |
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Abstract To investigate the dynamic viscoelastic property of recycled modified asphalt mixture, the asphalt mixture performance test (AMPT) was carried out. The effects of test temperature and loading frequency on dynamic modulus and phase angle of recycled asphalt mixture were analyzed, and the effects of RAP-SBS contents, rejuvenating agent and aging condition were also analyzed to establish master curves of dynamic modulus. The results show that with the increasing of temperature, the dynamic modulus of recycled mixtures tends to be consistent under different loading frequencies, while the phase angle is different. When the RAP-SBS content is more than 70%, the phase angle peak disappears. The viscosity of recycled mixture is more significant at high temperature, and the dynamic modulus is less affected by loading frequency. The phase angle of recycled mixture is increased with the increasing of loading frequency at middle and low temperatures and is increased first with latter decreasing at high temperature. The peak and the peak loading frequency are less than these of new mixture and are decreased further with the increasing of RAP-SBS content. In the wide loading frequency range, the dynamic modulus values of recycled mixture and new mixture tend to be consistent with no effects of RAP-SBS content, rejuvenating agent and aging.
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2019, Vol. 40 
