Emulsified asphalt as an indispensable raw material for high-speed railway ballastless slab track and pavement structure is subjected to different combinations of material and construction parameters leading to uncontrollable demulsification time. By examining the demulsification time of cationic emulsified asphalt mixed with cement or cement and sand, the factors influencing the demulsification time of emulsified asphalt were studied. The increase of pH value is detrimental to the hydration of cement, and it is beneficial to prolonging the demulsification time. The incorporation of the stabilisers (Polyvinyl acetate, sodium carboxymethylcellulose, CaCl₂ and NH₄Cl), either increasing the viscosity of the fresh cement emulsified asphalt composite binder or changing the electric double layer on the surface of asphalt particles, this is detrimental to prolonging the demulsification time of emulsified asphalt mixed with cement. The increase of the stirring speed can shorten the demulsification time of emulsified asphalt. Meanwhile, increasing of additional water can dilute cement and asphalt particles, and prolong the demulsification time. Conversely, an increase amount of cement will lead to an increase in the amount of water used for wrapping and hydration, and shortening of demulsification time Meanwhile, with the treatment time prolonging, the demulsification speed of the asphalt emulsion increases. In addition, the demulsification process of emulsified asphalt in cement emulsified asphalt mortar actually is a process of asphalt re-aggregation observed by the optical microscope.

乳化沥青作为高速铁路无砟板式轨道和路面结构不可缺少的原材料，其材料和施工参数的组合不同，导致破乳时间不可控。通过考察阳离子乳化沥青与水泥或水泥和沙子混合后的破乳时间，研究了影响乳化沥青破乳时间的因素。pH值升高不利于水泥水化，有利于延长破乳时间。加入稳定剂（聚醋酸乙烯酯、羧甲基纤维素钠、CaCl ₂和 NH ₄Cl)，要么增加新拌水泥乳化沥青复合粘结剂的粘度，要么改变沥青颗粒表面的双电层，不利于延长乳化沥青与水泥混合的破乳时间。搅拌速度的提高可以缩短乳化沥青的破乳时间。同时，增加附加水可以稀释水泥和沥青颗粒，延长破乳时间。反之，水泥用量的增加会导致包裹和水化用水量增加，破乳时间缩短；同时，随着处理时间的延长，沥青乳液的破乳速度会加快。此外，