Evaluation of Service Level of Emulsions Used in Surface Treatments in Different Stages of Ageing

The application of asphalt emulsions in pavement construction is common in courses that do not require heating. Among those, it is possible to highlight chip seal (CS) treatments. In this type of pavement, it is essential to consider the performance of the binder. This paper aims to propose a study of emulsions used in CS, focusing in acquiring rheological properties that might correlate to the performance of emulsions over the service life, regarding to defects like aggregate loss and bleeding. For this purpose, it was selected a type of emulsion frequently used in this field (rapid-setting cationic emulsion). The residue of the emulsion was recovered and then it was proceeded simultaneously both the long-term ageing by means of the Pressure Aging Vessel (PAV) and ageing in UV chamber. After that, it was performed two different tests. The samples were subjected to the Dynamic Shear Rheometer (DSR), in which it was performed a frequency sweep and it was obtained the complex modulus (G*) of the materials and the MSCR test. Based on the tests developed in this study it was possible to describe the modifications occurred in the binder properties by ageing and its effects on CS pavements. Furthermore, it was possible to give predictions of bleeding during service life of the emulsion and its performance over this time, mostly relating to this defect.