Workability Indicator for Emulsified Asphalt Recycled Mixture and Influence Factors

In order to study the workability of emulsified asphalt cold recycled mixture(ECRM), the different characteristics of emulsified asphalt, reclaimed asphalt pavement (RAP) content and the influence laws of mixing water content were researched with the self-developed workability test equipment. Moreover, the significance level of influence factors was analyzed by statistic methods.Finally,the rationality of this method and the indicator was verified by back-calculating the jelling time and the volume parameter of superpave gyratory compactor (SGC) molding method.The result shows that the workability of ECRM become worse with increasing RAP content, which can be siginificantly improved by proper mixing water content.RAP content and mixing water content have a significantly impacts on the workability,while the emulsified asphalt has no such effects. ECRM has the optimal timing of the compaction after mixing, when the torque threshold is recommended for 20N·m.