Effect of Reflective Thermal Insulation Coatings on Temperature and Stress of Track Slab

To reduce the slab temperature and internal stress of ballastless track and alleviate damage caused by ballastless track expansion during high temperature period in summer, a reflective thermal insulation coating for ballastless track was explored with titanium dioxide, glass beads, and other components. The rationality of the dosage of each component was explored, and its cooling performance was tested under infrared light and natural light. The influence of the temperature difference between the surface and the interior of track slab on the internal stress of track slab was analyzed. The results show that the coating can decrease the surface temperature of track slab by up to 16 ℃ during the high temperature period in summer, it can also decrease the temperature difference between the surface and the depth of 180 mm of track slab from 24 ℃ to 12 ℃, with a decrease of about 50%, and effectively decrease the stress of track slab by 0.4 MPa. The coating can effectively reduce the risk of various track diseases caused by temperature stress.