Cationic modified emulsified asphalt and application thereof in slab ballastless track

The invention relates to cationic modified emulsified asphalt which is composed of low-molecular modified petroleum asphalt, a cationic emulsifier, a stabilizer and water. The application of the cationic modified emulsified asphalt in a slab ballastless track provided by the invention means that the cationic modified emulsified asphalt is contained in cement emulsified asphalt mortar poured in a gap between a track slab of the CRTS I type slab ballastless track and a base plate. The cationic modified emulsified asphalt provided by the invention has excellent low-temperature elastic resilience; the cement emulsified asphalt mortar for the CRTS I type slab ballastless track, which is prepared from the cationic modified emulsified asphalt provided by the invention, has the advantages of good fluidity and stability, proper mechanical property and excellent low-temperature elasticity and toughness and crack resistance and is particularly suitable for a mortar filling layer in the CRTS I type slab ballastless track of a high-speed railway or a railway passenger dedicated line in severe cold areas; the dynamics of the CRTS I type slab ballastless track of the high-speed railway and the railway passenger dedicated line in the severe cold areas and the requirement for six years of service life in China can be met.