Research on the demulsification process of cement asphalt mortar mixture-emulsified asphalt

In this paper, the demulsification process and the influencing factors of the emulsified asphalt from the perspectives of CA mortar solidification process, particle size change, influence of cement content on emulsified asphalt emulsion, and emulsified asphalt aggregation process are analyzed. It studies at the demulsification process of emulsified asphalt in the composite cement asphalt mortar (CA mortar). The results show that the water reducer has significant effect on viscosity variation: low viscosity period lasts longer with amount of water reducer increasing and water reducer can adjust demulsification speed under cement influence. The process of emulsified asphalt demulsification can be divided into three periods: the period of cement contacting with emulsified asphalt, dynamic equilibrium period, and accelerated demulsification period. When the content of cement is large, cement particles are less coated by asphalt and the hydration rate is faster, which promotes breaking and aggregation of emulsified asphalt. The optical microscope observation analysis showed that the demulsification process is just the process of aggregation and combination of asphalt particles.