Rheological Properties of Emulsified Asphalt Residue for Cold Regeneration

In order to deeply understand the characteristics of emulsified asphalt material for cold recycling and the mechanism of its residue action, dynamic shear rheological test and repeated creep test were adopted. Emulsified asphalt residues were prepared under two different conditions of a high-temperature evaporation mode and a low-temperature evaporation mode. The material composition was changed by changing the type and dosage of emulsifier and adding modifier. Combined with variance analysis, the influence of different material composition and preparation methods on the rheological properties of emulsified asphalt residue was analyzed. The test results show that the type, dosage and preparation method of emulsifier have significant influence on the rheological properties of emulsified asphalt residue at high temperature. The rutting factor of residue shows a power function relation with temperature. The variation characteristics of rutting factor of modified emulsified asphalt residue under high-temperature evaporation are obviously different from that of common emulsified asphalt residue, while the variation characteristics under low-temperature evaporation are consistent with that of common emulsified asphalt residue, and the PG classification temperature of emulsified asphalt residue will be reduced under high-temperature evaporation. The modified emulsified asphalt residue presents the viscoelastic fluid characteristic of irregular curve change in the 1st loading stage, which is inconsistent with the rheological characteristic of the modified emulsified asphalt residue under the condition of low temperature evaporation. The rutting factor and creep compliance are used to evaluate the high temperature performance of common emulsified asphalt residue under the same evaporation condition, which has good consistency. In this study, it is proposed that low-temperature evaporation method should be used to obtain the residue of modified emulsified asphalt, and creep compliance should be used as the high-temperature performance evaluation index. © 2020, Materials Review Magazine. All right reserved.