Dynamic Viscoelastic Properties of Hot Recycled Asphalt Mixture Based on CAM Model

Abstract

Abstract: In order to study the influences of regenerants on the dynamic properties of the asphalt mixture, the heavy petroleum-based and bio-oil-based regenerants were selected to prepare the recycled asphalt and the asphalt mixture. Through the penetration, softening point, dyctility tests of the asphalt and the dynamic modulus tests of the asphalt mixture under different regenerant content, the dynamic of the recycled asphalt mixture were analyzed according to the principle of time-temperature equivalence and the improved Christensen-Anderson-Marasteanu (CAM) model. The results show that with the increase of the regenerant content, the penetration and ductility of the asphalt in RAP increase, and the softening point decreases. The incorporation of the regenerant significantly improves the ductility of the asphalt. Taking into account the economy and road performance, 12% (mass fraction) is the best content of the regenerant. Both types of regenerants change the temperature sensitivity and viscoelastic properties of RAP, so that the dynamic modulus of the recycled asphalt mixture is reduced and the phase angle increases. The improved CAM mode can fit the dynamic modulus and phase angle of the recycled asphalt mixture with the development of frequency very well, and the fitting accuracy is above 0.950. The dynamic modulus and phase angle of the two recycled asphalt mixtures are affected by the loading frequency. When the loading frequency is higher than 10 Hz, the bio-oil-based recycled asphalt mixture has a lower dynamic modulus and a higher phase angle than the petroleum-based recycled asphalt mixture, while the result is the opposite when the loading frequency is lower than 0.01 Hz, such the dynamic viscoelastic properties are beneficial for improving the high temperature stability and low temperature crack resistance of the asphalt mixture at the same time.

Key words: regenerant, dynamic modulus, phase angle, CAM model, viscoelastic property

CLC Number:

U414

LAN Jianli, GAO Xuekai, KONG Fansheng. Dynamic Viscoelastic Properties of Hot Recycled Asphalt Mixture Based on CAM Model[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(7): 2454-2460.

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