ABSTRACT
When cold recycling emulsified asphalt mixtures are used in the overhaul projects of urban roads, the maintenance conditions by traffic closing always cannot be achieved. Therefore, great initial and terminal performances are required. In this paper, the initial performance of cold recycling emulsified asphalt mixture was evaluated by cohesion tests, sweeping tests and rutting tests. The terminal water stability and durability of cold recycling emulsified asphalt mixture were evaluated by splitting tests, Marshall tests, freeze-thaw splitting tests and fatigue tests. The effects of emulsifier type, gradation, cement dosage and RAP dosage on the initial and terminal performances of cold recycling emulsified asphalt mixtures were investigated for their applications in urban roads. The results showed that the abilities of cold recycling emulsified asphalt mixtures to resist early damages and to ensure good terminal performance can be enhanced by optimizing or adjusting the compositions of emulsifier, increasing the ratio of RAP, properly increasing the dosage of cement, and selecting finer gradation materials.
